whamcloud/device-scanner

Builds an in-memory representation of devices using Udev and ZED.

ARCHIVED: This repo has been moved into the integrated manager for lustre repo (https://github.com/whamcloud/integrated-manager-for-lustre/tree/master/device-scanner). All future work will happen within that repo.

device-scanner's Issues

Convert to Rust

Convert device-scanner, scanner-proxy, device-aggregator to use Rust.

benefits

• Less tooling - currently dev needs: dotnet-core, nodejs, mono, paket. dev with Rust needs: rust.

• 0 Runtime dependencies - Rust spits out binaries, we can remove the dep we take on nodejs on the agent, which we currently have to maintain in our Copr.

• Faster, less memory usage:

Current

Rust

• Threading plus safety guarantees between threads: https://doc.rust-lang.org/book/second-edition/ch16-00-concurrency.html

Improve test coverage for device aggregator

Since the improvements in #203 , components have been split out into modules the majority of which include only pure functions, improve unit test coverage of these modules.

Udev remove not matching expectation

When I stopped docker via systemctl, I got:

Mar 06 16:25:28 devicescannernode node[32021]: Error: Expecting an object with a field named `DEVLINKS` but instead got:
Mar 06 16:25:28 devicescannernode node[32021]: {
Mar 06 16:25:28 devicescannernode node[32021]: "ACTION": "remove",
Mar 06 16:25:28 devicescannernode node[32021]: "DEVNAME": "/dev/dm-2",
Mar 06 16:25:28 devicescannernode node[32021]: "DEVPATH": "/devices/virtual/block/dm-2",
Mar 06 16:25:28 devicescannernode node[32021]: "DEVTYPE": "disk",
Mar 06 16:25:28 devicescannernode node[32021]: "ID_FS_TYPE": "",
Mar 06 16:25:28 devicescannernode node[32021]: "MAJOR": "253",
Mar 06 16:25:28 devicescannernode node[32021]: "MINOR": "2",
Mar 06 16:25:28 devicescannernode node[32021]: "SEQNUM": "2705",
Mar 06 16:25:28 devicescannernode node[32021]: "SUBSYSTEM": "block",
Mar 06 16:25:28 devicescannernode node[32021]: "USEC_INITIALIZED": "97843536"
Mar 06 16:25:28 devicescannernode node[32021]: }

LVM Integration test

LVM Integration test

zpool is never returned after being taken for a prop

In:

device-scanner/device-scanner-daemon/src/reducers/zed.rs

Line 89 in d3fb733

let mut pool = take_pool(&mut zed_events, guid)?;

When a pool is taken, it is not put back into the state when it's done being used.

Try to resend when scanner-proxy gets a http connect error

There may be cases where the manager is unreachable (network hiccup, it was stopped, etc...)

In those cases, we will get an error like:

Apr 04 22:33:38 mds2.lfs.local node[10024]: Proxy connecting to device scanner...
Apr 04 23:37:45 mds2.lfs.local node[10024]: Unable to generate HTTPS request connect ECONNREFUSED 10.73.10.10:443, Error: connect ECONNREFUSED 10.73.10.10:443
Apr 04 23:37:45 mds2.lfs.local node[10024]: at Object.exports._errnoException (util.js:1020:11)
Apr 04 23:37:45 mds2.lfs.local node[10024]: at exports._exceptionWithHostPort (util.js:1043:20)
Apr 04 23:37:45 mds2.lfs.local node[10024]: at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1090:14)

In the scanner-proxy.

That error comes from:

https://github.com/intel-hpdd/device-scanner/blob/83e45faffdf678b34b01fa6f0ed0f6575cba4a00/IML.ScannerProxyDaemon/src/Transmit.fs#L26-L28

We should probably retry the send (perhaps once a minute) until we get a success. While doing this, we should account for new incoming data and only keep the last item for sending.

Share Devices

Background

Devices such as mdraid, volume groups, and zpools may be shared between hosts.

If a device is shared it means all it's underlying devices are also shared on multiple hosts.

Also of note is the possibility that a device could be comprised of partially shared and partially local storage:

Implementation

In order to determine if a device is shared between hosts, we can look at a unique ID + the type of the device.

For most devices, we can rely on the device serial; for logical volumes we need to look at uuid, likewise for zpools we need to look at guids.

device-aggregator gets a host's device list pushed to it when anything changes. Take that list and use it to populate a directed acyclic graph rooted at each host in two passes:

1. Add edges for parent -> child devices.
2. Add edges for shared devices.

Integration Tests

• Create integration test framework
  • Update the vagrant file such that a vagrant test node can communicate with and run the integration tests against the device-scanner node
  • Should execute test commands over ssh to the device-scanner node
  • Create a state monad that will be used to rollback commands
  • Create a computation expression that will utilize the state monad
  • Should fail the entire suite if an unrecoverable error occurs. There is no need to continue running the tests once an error occurs.
  • Should stop rolling back if a rollback command encounters an error.
  • Should immediately print any command errors if the tests stop due to a rollback failure. This way we can see why both the command and rollback failed.
• Add integration tests:
  • Alter vagrant setup to have 30 disks
  • Integrate buffer serializer
  • Initial "info" data after triggering
  • Updated udev after removing a device
  • Updated udev after adding a device
  • Updated udev after creating a new partition in parted
  • Updated udev after adding, removing, modifying DM devices
  • Update with mdraid
  • Update with lvm
  • Update with multipath
  • Test local mounts
  • Test swap mounts
  • Handle /var/lib/chroma/ update
    • Vagrantfile
      • Setup manager node
      • Use mock to create an rpm to be used on the manager node
      • Install the device aggregator on the manager node
      • Install the proxy scanner on the device-scanner node
      • Create Manager Proxy server to forward requests to device aggregator
      • Make a change on the device scanner node and ensure that it is propagated to the device aggregator
  • Testing ZED
    • yum install zfs
    • Creating a zpool
    • Destroying a zpool
    • Creating a dataset
    • Creating a zvol
    • Destroying a dataset
    • Importing and exporting pools
    • Adding a new device to a pool
    • Faulting a pool
    • Setting properties on a pool
    • Removing properties on a pool
    • Setting properties on a dataset
    • Removing properties on a dataset
    • Testing two pools with the same name are importable / detected correctly.

scanner should filter dups

Right now the devie-scanner emits every time someone writes to it's socket.

This means there are many cases where we send the same data over the network.
We should not be sending data when nothing has changed.
Add a filter to device-scanner that compares the previous send to the current one (for each persistent socket). If they are equal then do not send anything.

This will need to be done in tandem with #136 to ensure everything keeps working.

Create a stream that will send when udev event queue has settled.

Currently, the integration tests were seeing inconsistent states between runs. This is because the polling is taking place before udev has had a chance to "settle" all events. Instead of having to run udevadm settle every time we poll, the device scanner should do the following:

1. Whenever a Udev message passes through, run udevadm settle in a child_process.
2. if the settle returns without us having a new message, return the current message.
3. If a new message comes in discard the old message when settle returns.
4. if settle times out, run it again.

All this can be done inside a stream filter.

Important to note that only events coming from Udev should be throttled this way. ZED events should not have this restriction.

Failure when encountering encoded characters in udev rules

Json encoding/decoding failure encountered when udev output including "ID_VENDOR_ENC": "QEMU\x20\x20\x20\x20" is processed by LineDelimitedJsonStream. result is incomplete device information.

Some of the parameters don't get filled in the relevant part of the scanner output, I first noticed it because ID_FS_USAGE doesn't get filled when processing the following udev entry:

>> udevadm test /devices/pci0000:00/0000:00:05.0/virtio1/host2/target2:0:0/2:0:0:3/block/sdc/sdc1
... output removed ...
.ID_FS_TYPE_NEW=zfs_member
ACTION=add
DEVLINKS=/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_disk4-part1 /dev/disk/by-label/testPool4 /dev/disk/by-partlabel/zfs-1c5ec2d7ed7a9fd7 /dev/disk/by-partuuid/7b5d417a-ad45-1242-9261-b3e0fc34d21e /dev/disk/by-path/virtio-pci-0000:00:05.0-scsi-0:0:0:3-part1 /dev/disk/by-uuid/5485205461528473835
DEVNAME=/dev/sdc1
DEVPATH=/devices/pci0000:00/0000:00:05.0/virtio1/host2/target2:0:0/2:0:0:3/block/sdc/sdc1
DEVTYPE=partition
ID_BUS=scsi
ID_FS_LABEL=testPool4
ID_FS_LABEL_ENC=testPool4
ID_FS_TYPE=zfs_member
ID_FS_USAGE=filesystem
ID_FS_UUID=5485205461528473835
ID_FS_UUID_ENC=5485205461528473835
ID_FS_UUID_SUB=6326197245473198534
ID_FS_UUID_SUB_ENC=6326197245473198534
ID_FS_VERSION=5000
ID_MODEL=QEMU_HARDDISK
ID_MODEL_ENC=QEMU\x20HARDDISK\x20\x20\x20
ID_PART_ENTRY_DISK=8:32
ID_PART_ENTRY_NAME=zfs-1c5ec2d7ed7a9fd7
ID_PART_ENTRY_NUMBER=1
ID_PART_ENTRY_OFFSET=2048
ID_PART_ENTRY_SCHEME=gpt
ID_PART_ENTRY_SIZE=20951040
ID_PART_ENTRY_TYPE=6a898cc3-1dd2-11b2-99a6-080020736631
ID_PART_ENTRY_UUID=7b5d417a-ad45-1242-9261-b3e0fc34d21e
ID_PART_TABLE_TYPE=gpt
ID_PATH=virtio-pci-0000:00:05.0-scsi-0:0:0:3
ID_PATH_TAG=virtio-pci-0000_00_05_0-scsi-0_0_0_3
ID_REVISION=0.12
ID_SCSI=1
ID_SCSI_SERIAL=disk4
ID_SERIAL=0QEMU_QEMU_HARDDISK_disk4
ID_SERIAL_SHORT=disk4
ID_TYPE=disk
ID_VENDOR=QEMU
ID_VENDOR_ENC=QEMU\x20\x20\x20\x20
IML_IS_RO=0
IML_SCSI_80=SQEMU    QEMU HARDDISK   disk4
IML_SCSI_83=0QEMU    QEMU HARDDISK   disk4
IML_SIZE=20951040
MAJOR=8
MINOR=33
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=712549254

Which results in the following device-scanner output for the device path:

"/devices/pci0000:00/0000:00:05.0/virtio1/host2/target2:0:0/2:0:0:3/block/sdc/sdc1": {
      "MAJOR": "8",
      "MINOR": "33",
      "PATHS": [
        "/dev/sdc1",
        "/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_disk4-part1",
        "/dev/disk/by-partlabel/zfs-1c5ec2d7ed7a9fd7",
        "/dev/disk/by-partuuid/7b5d417a-ad45-1242-9261-b3e0fc34d21e",
        "/dev/disk/by-path/virtio-pci-0000:00:05.0-scsi-0:0:0:3-part1"
      ],
      "DEVNAME": "/dev/sdc1",
      "DEVPATH": "/devices/pci0000:00/0000:00:05.0/virtio1/host2/target2:0:0/2:0:0:3/block/sdc/sdc1",
      "DEVTYPE": "partition",
      "ID_VENDOR": "QEMU",
      "ID_MODEL": "QEMU_HARDDISK",
      "ID_SERIAL": "0QEMU_QEMU_HARDDISK_disk4",
      "ID_FS_TYPE": null,
      "ID_FS_USAGE": null,
      "ID_PART_ENTRY_NUMBER": 1,

Fix discover_zpool() in aggregator to work with recent scanner output format changes

part of #152

New aggregator tests for the discovery of zpools on shared storage are failing because of changes in vdev output. The functionality needs updating to work with the new format.

Aggregator Error

Seeing the following error occasionally in device-aggregator

May 19 10:29:46 lotus-50vm13 node[14304]: Error: Seq did not contain any matching element
May 19 10:29:46 lotus-50vm13 node[14304]: at __failIfNone (/usr/lib64/iml-device-aggregator-daemon/device-aggregator-daemon:581:15)
May 19 10:29:46 lotus-50vm13 node[14304]: at find (/usr/lib64/iml-device-aggregator-daemon/device-aggregator-daemon:749:12)
May 19 10:29:46 lotus-50vm13 node[14304]: at /usr/lib64/iml-device-aggregator-daemon/device-aggregator-daemon:4425:30
May 19 10:29:46 lotus-50vm13 node[14304]: at fold (/usr/lib64/iml-device-aggregator-daemon/device-aggregator-daemon:1410:48)
May 19 10:29:46 lotus-50vm13 node[14304]: at fold (/usr/lib64/iml-device-aggregator-daemon/device-aggregator-daemon:690:19)
May 19 10:29:46 lotus-50vm13 node[14304]: at map$3 (/usr/lib64/iml-device-aggregator-daemon/device-aggregator-daemon:1410:22)
May 19 10:29:46 lotus-50vm13 node[14304]: at /usr/lib64/iml-device-aggregator-daemon/device-aggregator-daemon:4424:32
May 19 10:29:46 lotus-50vm13 node[14304]: at fold (/usr/lib64/iml-device-aggregator-daemon/device-aggregator-daemon:690:19)
May 19 10:29:46 lotus-50vm13 node[14304]: at parsePools (/usr/lib64/iml-device-aggregator-daemon/device-aggregator-daemon:4423:12)
May 19 10:29:46 lotus-50vm13 node[14304]: at /usr/lib64/iml-device-aggregator-daemon/device-aggregator-daemon:4449:16
May 19 10:29:46 lotus-50vm13 systemd[1]: device-aggregator.service: main process exited, code=exited, status=1/FAILURE
May 19 10:29:46 lotus-50vm13 systemd[1]: Unit device-aggregator.service entered failed state.
May 19 10:29:46 lotus-50vm13 systemd[1]: device-aggregator.service failed.
May 19 10:29:46 lotus-50vm13 systemd[1]: device-aggregator.service holdoff time over, scheduling restart.
May 19 10:29:46 lotus-50vm13 systemd[1]: Started IML Device Aggregator Daemon.
May 19 10:29:46 lotus-50vm13 systemd[1]: Starting IML Device Aggregator Daemon...

Some zpools incorrectly listed for all hosts

There are occasions where zpools may be listed for more hosts than they can be mounted on.

This is stemming from device-aggregator. Here is the aggregator output:

Click to expand

{
  "mds1.local": {
    "devs": {
      "253:0": {
        "major_minor": "253:0",
        "path": "/dev/mapper/mpatha",
        "paths": [
          "/dev/mapper/mpatha",
          "/dev/disk/by-id/dm-name-mpatha",
          "/dev/disk/by-id/dm-uuid-mpath-360014059181ce7efcf24698bd6119664",
          "/dev/mgt",
          "/dev/dm-0"
        ],
        "serial_80": "SLIO-ORG mgt1            9181ce7e-fcf2-4698-bd61-1966487aec5d",
        "serial_83": "360014059181ce7efcf24698bd6119664",
        "size": "536870912",
        "filesystem_type": null,
        "filesystem_usage": null,
        "device_type": "disk",
        "device_path": "/devices/virtual/block/dm-0",
        "partition_number": null,
        "is_ro": false,
        "is_zfs_reserved": false,
        "parent": null,
        "dm_multipath": null,
        "dm_lv": null,
        "lv_uuid": null,
        "dm_vg": null,
        "vg_uuid": null,
        "dm_slave_mms": [
          "8:16",
          "8:32"
        ],
        "dm_vg_size": null,
        "md_uuid": null,
        "md_device_paths": []
      },
      "253:1": {
        "major_minor": "253:1",
        "path": "/dev/mapper/mpathb",
        "paths": [
          "/dev/mapper/mpathb",
          "/dev/disk/by-id/dm-name-mpathb",
          "/dev/disk/by-id/dm-uuid-mpath-36001405d3df28ede5e9469abfb8091c6",
          "/dev/mdt",
          "/dev/dm-1"
        ],
        "serial_80": "SLIO-ORG mdt1            d3df28ed-e5e9-469a-bfb8-091c6d414c63",
        "serial_83": "36001405d3df28ede5e9469abfb8091c6",
        "size": "5368709120",
        "filesystem_type": null,
        "filesystem_usage": null,
        "device_type": "disk",
        "device_path": "/devices/virtual/block/dm-1",
        "partition_number": null,
        "is_ro": false,
        "is_zfs_reserved": false,
        "parent": null,
        "dm_multipath": null,
        "dm_lv": null,
        "lv_uuid": null,
        "dm_vg": null,
        "vg_uuid": null,
        "dm_slave_mms": [
          "8:48",
          "8:64"
        ],
        "dm_vg_size": null,
        "md_uuid": null,
        "md_device_paths": []
      },
      "8:0": {
        "major_minor": "8:0",
        "path": "/dev/disk/by-id/ata-VBOX_HARDDISK_VB289a63d7-b2394fde",
        "paths": [
          "/dev/disk/by-id/ata-VBOX_HARDDISK_VB289a63d7-b2394fde",
          "/dev/disk/by-path/pci-0000:00:01.1-ata-1.0",
          "/dev/sda"
        ],
        "serial_80": "SATA     VBOX HARDDISK   VB289a63d7-b2394fde",
        "serial_83": "1ATA     VBOX HARDDISK                           VB289a63d7-b2394fde",
        "size": "42949672960",
        "filesystem_type": null,
        "filesystem_usage": null,
        "device_type": "disk",
        "device_path": "/devices/pci0000:00/0000:00:01.1/ata1/host0/target0:0:0/0:0:0:0/block/sda",
        "partition_number": null,
        "is_ro": false,
        "is_zfs_reserved": false,
        "parent": null,
        "dm_multipath": null,
        "dm_lv": null,
        "lv_uuid": null,
        "dm_vg": null,
        "vg_uuid": null,
        "dm_slave_mms": [],
        "dm_vg_size": null,
        "md_uuid": null,
        "md_device_paths": []
      },
      "8:1": {
        "major_minor": "8:1",
        "path": "/dev/disk/by-id/ata-VBOX_HARDDISK_VB289a63d7-b2394fde-part1",
        "paths": [
          "/dev/disk/by-id/ata-VBOX_HARDDISK_VB289a63d7-b2394fde-part1",
          "/dev/disk/by-path/pci-0000:00:01.1-ata-1.0-part1",
          "/dev/disk/by-uuid/f52f361a-da1a-4ea0-8c7f-ca2706e86b46",
          "/dev/sda1"
        ],
        "serial_80": "SATA     VBOX HARDDISK   VB289a63d7-b2394fde",
        "serial_83": "1ATA     VBOX HARDDISK                           VB289a63d7-b2394fde",
        "size": "42948624384",
        "filesystem_type": "xfs",
        "filesystem_usage": "filesystem",
        "device_type": "partition",
        "device_path": "/devices/pci0000:00/0000:00:01.1/ata1/host0/target0:0:0/0:0:0:0/block/sda/sda1",
        "partition_number": 1,
        "is_ro": false,
        "is_zfs_reserved": false,
        "parent": "8:0",
        "dm_multipath": null,
        "dm_lv": null,
        "lv_uuid": null,
        "dm_vg": null,
        "vg_uuid": null,
        "dm_slave_mms": [],
        "dm_vg_size": null,
        "md_uuid": null,
        "md_device_paths": []
      },
      "8:16": {
        "major_minor": "8:16",
        "path": "/dev/disk/by-id/scsi-360014059181ce7efcf24698bd6119664",
        "paths": [
          "/dev/disk/by-id/scsi-360014059181ce7efcf24698bd6119664",
          "/dev/disk/by-id/wwn-0x60014059181ce7efcf24698bd6119664",
          "/dev/disk/by-path/ip-10.73.40.10:3260-iscsi-iqn.2015-01.com.whamcloud.lu:mds-lun-0",
          "/dev/mgt",
          "/dev/sdb"
        ],
        "serial_80": "SLIO-ORG mgt1            9181ce7e-fcf2-4698-bd61-1966487aec5d",
        "serial_83": "360014059181ce7efcf24698bd6119664",
        "size": "536870912",
        "filesystem_type": "mpath_member",
        "filesystem_usage": null,
        "device_type": "disk",
        "device_path": "/devices/platform/host2/session1/target2:0:0/2:0:0:0/block/sdb",
        "partition_number": null,
        "is_ro": false,
        "is_zfs_reserved": false,
        "parent": null,
        "dm_multipath": true,
        "dm_lv": null,
        "lv_uuid": null,
        "dm_vg": null,
        "vg_uuid": null,
        "dm_slave_mms": [],
        "dm_vg_size": null,
        "md_uuid": null,
        "md_device_paths": []
      },
      "8:32": {
        "major_minor": "8:32",
        "path": "/dev/disk/by-id/scsi-360014059181ce7efcf24698bd6119664",
        "paths": [
          "/dev/disk/by-id/scsi-360014059181ce7efcf24698bd6119664",
          "/dev/disk/by-id/wwn-0x60014059181ce7efcf24698bd6119664",
          "/dev/disk/by-path/ip-10.73.50.10:3260-iscsi-iqn.2015-01.com.whamcloud.lu:mds-lun-0",
          "/dev/mgt",
          "/dev/sdc"
        ],
        "serial_80": "SLIO-ORG mgt1            9181ce7e-fcf2-4698-bd61-1966487aec5d",
        "serial_83": "360014059181ce7efcf24698bd6119664",
        "size": "536870912",
        "filesystem_type": "mpath_member",
        "filesystem_usage": null,
        "device_type": "disk",
        "device_path": "/devices/platform/host3/session2/target3:0:0/3:0:0:0/block/sdc",
        "partition_number": null,
        "is_ro": false,
        "is_zfs_reserved": false,
        "parent": null,
        "dm_multipath": true,
        "dm_lv": null,
        "lv_uuid": null,
        "dm_vg": null,
        "vg_uuid": null,
        "dm_slave_mms": [],
        "dm_vg_size": null,
        "md_uuid": null,
        "md_device_paths": []
      },
      "8:48": {
        "major_minor": "8:48",
        "path": "/dev/disk/by-id/scsi-36001405d3df28ede5e9469abfb8091c6",
        "paths": [
          "/dev/disk/by-id/scsi-36001405d3df28ede5e9469abfb8091c6",
          "/dev/disk/by-id/wwn-0x6001405d3df28ede5e9469abfb8091c6",
          "/dev/disk/by-path/ip-10.73.40.10:3260-iscsi-iqn.2015-01.com.whamcloud.lu:mds-lun-1",
          "/dev/mdt",
          "/dev/sdd"
        ],
        "serial_80": "SLIO-ORG mdt1            d3df28ed-e5e9-469a-bfb8-091c6d414c63",
        "serial_83": "36001405d3df28ede5e9469abfb8091c6",
        "size": "5368709120",
        "filesystem_type": "mpath_member",
        "filesystem_usage": null,
        "device_type": "disk",
        "device_path": "/devices/platform/host2/session1/target2:0:0/2:0:0:1/block/sdd",
        "partition_number": null,
        "is_ro": false,
        "is_zfs_reserved": false,
        "parent": null,
        "dm_multipath": true,
        "dm_lv": null,
        "lv_uuid": null,
        "dm_vg": null,
        "vg_uuid": null,
        "dm_slave_mms": [],
        "dm_vg_size": null,
        "md_uuid": null,
        "md_device_paths": []
      },
      "8:64": {
        "major_minor": "8:64",
        "path": "/dev/disk/by-id/scsi-36001405d3df28ede5e9469abfb8091c6",
        "paths": [
          "/dev/disk/by-id/scsi-36001405d3df28ede5e9469abfb8091c6",
          "/dev/disk/by-id/wwn-0x6001405d3df28ede5e9469abfb8091c6",
          "/dev/disk/by-path/ip-10.73.50.10:3260-iscsi-iqn.2015-01.com.whamcloud.lu:mds-lun-1",
          "/dev/mdt",
          "/dev/sde"
        ],
        "serial_80": "SLIO-ORG mdt1            d3df28ed-e5e9-469a-bfb8-091c6d414c63",
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            "path": "/dev/disk/by-id/scsi-36001405d985484983e846f2b5046a3c8",
            "size": "5368709120"
          },
          {
            "major_minor": "8:224",
            "parent": null,
            "serial_83": "36001405d985484983e846f2b5046a3c8",
            "serial_80": "SLIO-ORG ost7            d9854849-83e8-46f2-b504-6a3c80648e63",
            "path": "/dev/disk/by-id/scsi-36001405d985484983e846f2b5046a3c8",
            "size": "5368709120"
          }
        ]
      },
      "mpathr": {
        "name": "mpathr",
        "block_device": "253:17",
        "nodes": [
          {
            "major_minor": "8:240",
            "parent": null,
            "serial_83": "360014057ac4eed25ec94d12be6166af5",
            "serial_80": "SLIO-ORG ost8            7ac4eed2-5ec9-4d12-be61-66af54c9793f",
            "path": "/dev/disk/by-id/scsi-360014057ac4eed25ec94d12be6166af5",
            "size": "5368709120"
          },
          {
            "major_minor": "65:0",
            "parent": null,
            "serial_83": "360014057ac4eed25ec94d12be6166af5",
            "serial_80": "SLIO-ORG ost8            7ac4eed2-5ec9-4d12-be61-66af54c9793f",
            "path": "/dev/disk/by-id/scsi-360014057ac4eed25ec94d12be6166af5",
            "size": "5368709120"
          }
        ]
      },
      "mpaths": {
        "name": "mpaths",
        "block_device": "253:18",
        "nodes": [
          {
            "major_minor": "65:16",
            "parent": null,
            "serial_83": "36001405f9b2583f9f8640d4aab75387b",
            "serial_80": "SLIO-ORG ost9            f9b2583f-9f86-40d4-aab7-5387b14be774",
            "path": "/dev/disk/by-id/scsi-36001405f9b2583f9f8640d4aab75387b",
            "size": "5368709120"
          },
          {
            "major_minor": "65:32",
            "parent": null,
            "serial_83": "36001405f9b2583f9f8640d4aab75387b",
            "serial_80": "SLIO-ORG ost9            f9b2583f-9f86-40d4-aab7-5387b14be774",
            "path": "/dev/disk/by-id/scsi-36001405f9b2583f9f8640d4aab75387b",
            "size": "5368709120"
          }
        ]
      },
      "mpatht": {
        "name": "mpatht",
        "block_device": "253:19",
        "nodes": [
          {
            "major_minor": "65:48",
            "parent": null,
            "serial_83": "360014050e13c9b64b814462b137bcc18",
            "serial_80": "SLIO-ORG ost10           0e13c9b6-4b81-4462-b137-bcc1882c8445",
            "path": "/dev/disk/by-id/scsi-360014050e13c9b64b814462b137bcc18",
            "size": "5368709120"
          },
          {
            "major_minor": "65:80",
            "parent": null,
            "serial_83": "360014050e13c9b64b814462b137bcc18",
            "serial_80": "SLIO-ORG ost10           0e13c9b6-4b81-4462-b137-bcc1882c8445",
            "path": "/dev/disk/by-id/scsi-360014050e13c9b64b814462b137bcc18",
            "size": "5368709120"
          }
        ]
      }
    }
  }
}

This appears to be due to the way zpools are resolved ultimately uses major:minor numbers, which may be duplicated across nodes for non-overlapping storage.

zpool identifier consistency

In the ZED output from the device scanner, zpool guids don't contain leading zeros whereas the zfs poolGuid does.

"zed":{"zpools":{"0x4e1f2b3ba6f5ce9":{"name":"testPool4","guid":"0x4e1f2b3ba6f5ce9",
...
"zfs":[{"poolGuid":"0x04e1f2b3ba6f5ce9","name":"testPool4/ds1"}],

install fails without zfs installed

when installing the iml-device-scanner rpm, still executing the triggerin scriptlet on scanner install even if zfs is not installed:

Apr 24 09:00:09 lotus-32vm5 systemd[1]: device-scanner.service: main process exited, code=killed, status=11/SEGV
Apr 24 09:00:09 lotus-32vm5 systemd[1]: Unit device-scanner.service entered failed state.
Apr 24 09:00:09 lotus-32vm5 systemd[1]: device-scanner.service failed.
Apr 24 09:00:09 lotus-32vm5 systemd[1]: device-scanner.service holdoff time over, scheduling restart.
Apr 24 09:00:09 lotus-32vm5 systemd[1]: Started IML Device Scanner Daemon.

Running transaction
  Installing : iml-device-scanner-2.1.0-2.el7.centos.x86_64                                                                1/1
Created symlink from /etc/systemd/system/sockets.target.wants/device-scanner.socket to /usr/lib/systemd/system/device-scanner.socket.
modprobe: FATAL: Module zfs not found.
  Verifying  : iml-device-scanner-2.1.0-2.el7.centos.x86_64                                                                1/1

Installed:
  iml-device-scanner.x86_64 0:2.1.0-2.el7.centos

Complete!

Replace explicit timers with use of setInterval

Instead of explicitly creating Timers and registering callbacks to be triggered on timeout, use setInterval now supported in fable fable-compiler/Fable#1349

Zed Integration

Integrate ZED in to IML.

• Create First pass of ZED integration #25
• Create libzfs bindings #1 #4 #10 #11
• Figure out if we should precompile bindings or compile on host / similar system arch.
• Integrate libzfs bindings into device-scanner. #50
• Use libzfs bindings to include drive paths as part of zpool info.

Add udev rule to mark bios boot partitions

We aren't filtering boot partitions in the agent, but we should mark boot partitions here so downstream can easily filter them.

A boot partition will have ID_PART_ENTRY_TYPE=21686148-6449-6e6f-744e-656564454649.

We don't want downstream to have to hardcode that uuid, so we can add a Udev rule that matches that prop / value and sets another prop IS_BIOS_BOOT={0|1} that downstream can consume and filter on.

Stop services when removed in IML UI

When storage server is removed in the UI, the scanner-proxy and (possibly) device-scanner services should be stopped so that the device-aggregator does not report their presence to the resource manager.

A possible change could be that the agent and all related services and packages are removed from the host when it is removed from the UI although that is not currently the case.

ingest state directly in the iml database

Instead of only exposing a http interface to device-aggregator state, we can push changes into the db as they occur.

The goal is to replace as much of the device CRUD operations in:

https://github.com/whamcloud/integrated-manager-for-lustre/blob/856f3e8025c19e7e260297ea004c697f57bcbfe1/chroma_core/plugins/linux.py and

https://github.com/whamcloud/integrated-manager-for-lustre/blob/master/chroma_core/services/plugin_runner/resource_manager.py as possible.

In addition, we should be able to remove the polling check for new devices that the manager currently does.

Replace explicit timers with use of setInterval

Instead of explicitly creating Timers and registering callbacks to be triggered on timeout, use setInterval now supported in fable fable-compiler/Fable#1349

mpath support

We need to make sure we have mpath output compatible with what was being presented with

https://github.com/intel-hpdd/intel-manager-for-lustre/blob/594c1b1389f3c503aee0904d5e2e69037dd0ac80/chroma-agent/chroma_agent/device_plugins/linux_components/device_mapper.py

in the device-scanner

Add support for mount detection

Udev can detect block device fs usage (minus lustre which is reported as ext4), but it is unable to detect fs mounts.

There are a few possibilities on detecting mount changes that I can think of:

• Udisks2: has the ability to detect mounts and communicates over D-Bus, however it doesn't detect lustre mounts.

• A .path unit: Could be notified when /proc/mounts changes, however it appears that inotify won't work on pseudo filesystems (need to confirm this is still the case).

  • This does not work, no service start on /proc/mounts change.

• use findmnt --poll in a small daemon that emits on changes.

  • This approach works, it also keeps the stream open and emits changes. ex:

         umount     /mnt/fs-OST0002 /dev/sdd lustre ro
         umount     /mnt/fs-OST0000 /dev/sdb lustre ro
         mount      /mnt/fs-OST0000 /dev/sdb lustre ro
         mount      /mnt/fs-OST0002 /dev/sdd lustre ro
    

• A small daemon that watches the file via polling and emits once it detects a difference. This is the least ideal case as it's the most resource intensive.

On the daemon side, we can collect the mounts into a persistent structure, possibly a top-level mounts key that corresponds to a Map or Set

LogicalVolume device should contain fs_uuid

LogicalVolume struct is missing

    pub fs_uuid: Option<String>,
    pub fs_label: Option<String>,

Like Mpath, ScsiDevice, Partition, and MdRaid devices.

fs_uuid and fs_label should also be populated from udev.

Finalize device-scanner changes

Update device-scanner prior to it's v2 release. These are a number of changes needed to both finalize the format, add additional data, and make the code amenable to future library updates. Items will be ticked as they are completed in the PR.

• Remove V1 / V2 connection handling split.
• Remove parsing of libzfs data into separate structures, using a single representation of node-libzfs data.
• Use Thot (similar to Elm encoding / decoding) to encode / decode all JSON types.
• Lowercase and normalize the block-device names so they are consistent with the rest of the data structure.
• Enable debugging from within the devicescannernode Vagrantfile.
• Update devicescannernode Vagrantfile to use multiple cores.
• Replace the "Info" command with "Stream" to better indicate it's intended usage.
• Move shared types into the IML.Types project so they can be reused across projects.
• Update changes with additional unit testing.

The most significant change is a new output format which can be seen here:

Click to show new format

{
  "zed": {
    "10852117089742109986": {
      "name": "test",
      "guid": "10852117089742109986",
      "health": "ONLINE",
      "hostname": "devicescannernode",
      "hostid": null,
      "state": "ACTIVE",
      "readonly": false,
      "size": 83886080,
      "vdev": {
        "Root": {
          "children": [
            {
              "Disk": {
                "guid": "0xB6A8CBA25566FB89",
                "state": "ONLINE",
                "path": "/dev/sdh1",
                "dev_id": "ata-VBOX_HARDDISK_081118FC1221NCJ6G807-part1",
                "phys_path": "pci-0000:00:0d.0-ata-8.0",
                "whole_disk": true,
                "is_log": false
              }
            }
          ],
          "spares": [],
          "cache": []
        }
      },
      "props": [],
      "datasets": [
        {
          "name": "test/ds",
          "guid": "14730311862543254361",
          "kind": "filesystem",
          "props": [
            {
              "name": "name",
              "value": "test/ds"
            },
            {
              "name": "type",
              "value": "filesystem"
            },
            {
              "name": "creation",
              "value": "1522493149"
            },
            {
              "name": "used",
              "value": "24576"
            },
            {
              "name": "available",
              "value": "41832448"
            },
            {
              "name": "referenced",
              "value": "24576"
            },
            {
              "name": "compressratio",
              "value": "1.00x"
            },
            {
              "name": "mounted",
              "value": "yes"
            },
            {
              "name": "quota",
              "value": "0"
            },
            {
              "name": "reservation",
              "value": "0"
            },
            {
              "name": "recordsize",
              "value": "131072"
            },
            {
              "name": "mountpoint",
              "value": "/test/ds"
            },
            {
              "name": "sharenfs",
              "value": "off"
            },
            {
              "name": "checksum",
              "value": "on"
            },
            {
              "name": "compression",
              "value": "off"
            },
            {
              "name": "atime",
              "value": "on"
            },
            {
              "name": "devices",
              "value": "on"
            },
            {
              "name": "exec",
              "value": "on"
            },
            {
              "name": "setuid",
              "value": "on"
            },
            {
              "name": "readonly",
              "value": "off"
            },
            {
              "name": "zoned",
              "value": "off"
            },
            {
              "name": "snapdir",
              "value": "hidden"
            },
            {
              "name": "aclinherit",
              "value": "restricted"
            },
            {
              "name": "createtxg",
              "value": "1266"
            },
            {
              "name": "canmount",
              "value": "on"
            },
            {
              "name": "xattr",
              "value": "on"
            },
            {
              "name": "copies",
              "value": "1"
            },
            {
              "name": "version",
              "value": "5"
            },
            {
              "name": "utf8only",
              "value": "off"
            },
            {
              "name": "normalization",
              "value": "none"
            },
            {
              "name": "casesensitivity",
              "value": "sensitive"
            },
            {
              "name": "vscan",
              "value": "off"
            },
            {
              "name": "nbmand",
              "value": "off"
            },
            {
              "name": "sharesmb",
              "value": "off"
            },
            {
              "name": "refquota",
              "value": "0"
            },
            {
              "name": "refreservation",
              "value": "0"
            },
            {
              "name": "guid",
              "value": "14730311862543254361"
            },
            {
              "name": "primarycache",
              "value": "all"
            },
            {
              "name": "secondarycache",
              "value": "all"
            },
            {
              "name": "usedbysnapshots",
              "value": "0"
            },
            {
              "name": "usedbydataset",
              "value": "24576"
            },
            {
              "name": "usedbychildren",
              "value": "0"
            },
            {
              "name": "usedbyrefreservation",
              "value": "0"
            },
            {
              "name": "logbias",
              "value": "latency"
            },
            {
              "name": "dedup",
              "value": "off"
            },
            {
              "name": "mlslabel",
              "value": "none"
            },
            {
              "name": "sync",
              "value": "standard"
            },
            {
              "name": "dnodesize",
              "value": "legacy"
            },
            {
              "name": "refcompressratio",
              "value": "1.00x"
            },
            {
              "name": "written",
              "value": "0"
            },
            {
              "name": "logicalused",
              "value": "12288"
            },
            {
              "name": "logicalreferenced",
              "value": "12288"
            },
            {
              "name": "volmode",
              "value": "default"
            },
            {
              "name": "filesystem_limit",
              "value": "18446744073709551615"
            },
            {
              "name": "snapshot_limit",
              "value": "18446744073709551615"
            },
            {
              "name": "filesystem_count",
              "value": "18446744073709551615"
            },
            {
              "name": "snapshot_count",
              "value": "18446744073709551615"
            },
            {
              "name": "snapdev",
              "value": "hidden"
            },
            {
              "name": "acltype",
              "value": "off"
            },
            {
              "name": "context",
              "value": "none"
            },
            {
              "name": "fscontext",
              "value": "none"
            },
            {
              "name": "defcontext",
              "value": "none"
            },
            {
              "name": "rootcontext",
              "value": "none"
            },
            {
              "name": "relatime",
              "value": "off"
            },
            {
              "name": "redundant_metadata",
              "value": "all"
            },
            {
              "name": "overlay",
              "value": "off"
            }
          ]
        }
      ]
    }
  },
  "blockDevices": {
    "/devices/pci0000:00/0000:00:0d.0/ata1/host0/target0:0:0/0:0:0:0/block/sda": {
      "major": "8",
      "minor": "0",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G801",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-1.0",
        "/dev/sda"
      ],
      "devName": "/dev/sda",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata1/host0/target0:0:0/0:0:0:0/block/sda",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G801",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "81920000",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G801",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G801",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata1/host0/target0:0:0/0:0:0:0/block/sda/sda1": {
      "major": "8",
      "minor": "1",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G801-part1",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-1.0-part1",
        "/dev/disk/by-uuid/e3131d27-2c31-4594-bf0c-bcd6f9a0c985",
        "/dev/sda1"
      ],
      "devName": "/dev/sda1",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata1/host0/target0:0:0/0:0:0:0/block/sda/sda1",
      "devType": "partition",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G801",
      "idFsType": "xfs",
      "idFsUsage": "filesystem",
      "idPartEntryNumber": 1,
      "size": "2097152",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G801",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G801",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata1/host0/target0:0:0/0:0:0:0/block/sda/sda2": {
      "major": "8",
      "minor": "2",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G801-part2",
        "/dev/disk/by-id/lvm-pv-uuid-3kzU9f-LipM-TJo5-zrd1-iNuL-nBHH-WGSlGv",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-1.0-part2",
        "/dev/sda2"
      ],
      "devName": "/dev/sda2",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata1/host0/target0:0:0/0:0:0:0/block/sda/sda2",
      "devType": "partition",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G801",
      "idFsType": "LVM2_member",
      "idFsUsage": "raid",
      "idPartEntryNumber": 2,
      "size": "79820800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G801",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G801",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata10/host9/target9:0:0/9:0:0:0/block/sdj": {
      "major": "8",
      "minor": "144",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G809",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-10.0",
        "/dev/sdj"
      ],
      "devName": "/dev/sdj",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata10/host9/target9:0:0/9:0:0:0/block/sdj",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G809",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G809",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G809",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata11/host10/target10:0:0/10:0:0:0/block/sdk": {
      "major": "8",
      "minor": "160",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G810",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-11.0",
        "/dev/sdk"
      ],
      "devName": "/dev/sdk",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata11/host10/target10:0:0/10:0:0:0/block/sdk",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G810",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G810",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G810",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata12/host11/target11:0:0/11:0:0:0/block/sdl": {
      "major": "8",
      "minor": "176",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G811",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-12.0",
        "/dev/sdl"
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        "/dev/disk/by-path/pci-0000:00:0d.0-ata-28.0",
        "/dev/sdab"
      ],
      "devName": "/dev/sdab",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata28/host27/target27:0:0/27:0:0:0/block/sdab",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G827",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G827",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G827",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata29/host28/target28:0:0/28:0:0:0/block/sdac": {
      "major": "65",
      "minor": "192",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G828",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-29.0",
        "/dev/sdac"
      ],
      "devName": "/dev/sdac",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata29/host28/target28:0:0/28:0:0:0/block/sdac",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G828",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G828",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G828",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata3/host2/target2:0:0/2:0:0:0/block/sdc": {
      "major": "8",
      "minor": "32",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G802",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-3.0",
        "/dev/sdc"
      ],
      "devName": "/dev/sdc",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata3/host2/target2:0:0/2:0:0:0/block/sdc",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G802",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G802",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G802",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata30/host29/target29:0:0/29:0:0:0/block/sdad": {
      "major": "65",
      "minor": "208",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G829",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-30.0",
        "/dev/sdad"
      ],
      "devName": "/dev/sdad",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata30/host29/target29:0:0/29:0:0:0/block/sdad",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G829",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G829",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G829",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata4/host3/target3:0:0/3:0:0:0/block/sdd": {
      "major": "8",
      "minor": "48",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G803",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-4.0",
        "/dev/sdd"
      ],
      "devName": "/dev/sdd",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata4/host3/target3:0:0/3:0:0:0/block/sdd",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G803",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G803",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G803",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata5/host4/target4:0:0/4:0:0:0/block/sde": {
      "major": "8",
      "minor": "64",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G804",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-5.0",
        "/dev/sde"
      ],
      "devName": "/dev/sde",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata5/host4/target4:0:0/4:0:0:0/block/sde",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G804",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G804",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G804",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata6/host5/target5:0:0/5:0:0:0/block/sdf": {
      "major": "8",
      "minor": "80",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G805",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-6.0",
        "/dev/sdf"
      ],
      "devName": "/dev/sdf",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata6/host5/target5:0:0/5:0:0:0/block/sdf",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G805",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G805",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G805",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata7/host6/target6:0:0/6:0:0:0/block/sdg": {
      "major": "8",
      "minor": "96",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G806",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-7.0",
        "/dev/sdg"
      ],
      "devName": "/dev/sdg",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata7/host6/target6:0:0/6:0:0:0/block/sdg",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G806",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G806",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G806",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata8/host7/target7:0:0/7:0:0:0/block/sdh": {
      "major": "8",
      "minor": "112",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G807",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-8.0",
        "/dev/sdh"
      ],
      "devName": "/dev/sdh",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata8/host7/target7:0:0/7:0:0:0/block/sdh",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G807",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G807",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G807",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata8/host7/target7:0:0/7:0:0:0/block/sdh/sdh1": {
      "major": "8",
      "minor": "113",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G807-part1",
        "/dev/disk/by-label/test",
        "/dev/disk/by-partlabel/zfs-8b1ccfacaf422df1",
        "/dev/disk/by-partuuid/4c1be3ed-4580-0048-9cfb-8a1eaf9b949a",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-8.0-part1",
        "/dev/disk/by-uuid/10852117089742109986",
        "/dev/sdh1"
      ],
      "devName": "/dev/sdh1",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata8/host7/target7:0:0/7:0:0:0/block/sdh/sdh1",
      "devType": "partition",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G807",
      "idFsType": "zfs_member",
      "idFsUsage": "filesystem",
      "idPartEntryNumber": 1,
      "size": "184320",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G807",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G807",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata8/host7/target7:0:0/7:0:0:0/block/sdh/sdh9": {
      "major": "8",
      "minor": "121",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G807-part9",
        "/dev/disk/by-partuuid/7328386e-2e3c-244c-9509-36a3317c0bb6",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-8.0-part9",
        "/dev/sdh9"
      ],
      "devName": "/dev/sdh9",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata8/host7/target7:0:0/7:0:0:0/block/sdh/sdh9",
      "devType": "partition",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G807",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": 9,
      "size": "16384",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G807",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G807",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/pci0000:00/0000:00:0d.0/ata9/host8/target8:0:0/8:0:0:0/block/sdi": {
      "major": "8",
      "minor": "128",
      "paths": [
        "/dev/disk/by-id/ata-VBOX_HARDDISK_081118FC1221NCJ6G808",
        "/dev/disk/by-path/pci-0000:00:0d.0-ata-9.0",
        "/dev/sdi"
      ],
      "devName": "/dev/sdi",
      "devPath": "/devices/pci0000:00/0000:00:0d.0/ata9/host8/target8:0:0/8:0:0:0/block/sdi",
      "devType": "disk",
      "idVendor": null,
      "idModel": "VBOX_HARDDISK",
      "idSerial": "VBOX_HARDDISK_081118FC1221NCJ6G808",
      "idFsType": null,
      "idFsUsage": null,
      "idPartEntryNumber": null,
      "size": "204800",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G808",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G808",
      "isReadOnly": false,
      "dmSlaveMms": [],
      "dmVgSize": null,
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": null,
      "dmVgName": null,
      "dmUuid": null,
      "mdUuid": null
    },
    "/devices/virtual/block/dm-0": {
      "major": "253",
      "minor": "0",
      "paths": [
        "/dev/centos/root",
        "/dev/disk/by-id/dm-name-centos-root",
        "/dev/disk/by-id/dm-uuid-LVM-jQnkXE3kiGdAhzhslCt2nmLZEO3Bq2Y51rSXU4VOZw0j4JVVgO8S9fjAhI88Feof",
        "/dev/disk/by-uuid/f4a999c3-a6d2-46f3-969a-594341c77969",
        "/dev/mapper/centos-root",
        "/dev/dm-0"
      ],
      "devName": "/dev/dm-0",
      "devPath": "/devices/virtual/block/dm-0",
      "devType": "disk",
      "idVendor": null,
      "idModel": null,
      "idSerial": null,
      "idFsType": "xfs",
      "idFsUsage": "filesystem",
      "idPartEntryNumber": null,
      "size": "77709312",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G801",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G801",
      "isReadOnly": false,
      "dmSlaveMms": [
        "8:2"
      ],
      "dmVgSize": "40865103872B",
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": "root",
      "dmVgName": "centos",
      "dmUuid": "LVM-jQnkXE3kiGdAhzhslCt2nmLZEO3Bq2Y51rSXU4VOZw0j4JVVgO8S9fjAhI88Feof",
      "mdUuid": null
    },
    "/devices/virtual/block/dm-1": {
      "major": "253",
      "minor": "1",
      "paths": [
        "/dev/centos/swap",
        "/dev/disk/by-id/dm-name-centos-swap",
        "/dev/disk/by-id/dm-uuid-LVM-jQnkXE3kiGdAhzhslCt2nmLZEO3Bq2Y5RneBEC5y8iJpLzpOyt1GsL6eva0iPk3f",
        "/dev/disk/by-uuid/bca6f9aa-e686-4073-a38a-0a18cd769cb9",
        "/dev/mapper/centos-swap",
        "/dev/dm-1"
      ],
      "devName": "/dev/dm-1",
      "devPath": "/devices/virtual/block/dm-1",
      "devType": "disk",
      "idVendor": null,
      "idModel": null,
      "idSerial": null,
      "idFsType": "swap",
      "idFsUsage": "other",
      "idPartEntryNumber": null,
      "size": "2097152",
      "scsi80": "SATA     VBOX HARDDISK   081118FC1221NCJ6G801",
      "scsi83": "1ATA     VBOX HARDDISK                           081118FC1221NCJ6G801",
      "isReadOnly": false,
      "dmSlaveMms": [
        "8:2"
      ],
      "dmVgSize": "40865103872B",
      "mdDevices": [],
      "dmMultipathDevicePath": null,
      "dmLvName": "swap",
      "dmVgName": "centos",
      "dmUuid": "LVM-jQnkXE3kiGdAhzhslCt2nmLZEO3Bq2Y5RneBEC5y8iJpLzpOyt1GsL6eva0iPk3f",
      "mdUuid": null
    }
  }
}

Fully resolve device graph

Right now device graph resolution is spread across multiple layers.

• device-scanner outputs somewhat raw list of uevents, pools, datasets and mounts
• device-aggregator massages into vgs, lvs, mds, mpath, pools, datasets, and block-devices. It also performs a first pass that combines pools shared on different hosts.
• device-aggregator output feeds into linux.py which creates concrete device types and persists them to the database (ScsiDevice, UnsharedDevice, LinuxDeviceNode, Partition, MdRaid, ZfsPool, ZfsDataset, ZfsPartition, LocalMount, LvmGroup, LvmVolume) and sets up parent linkage.
• resource_manager.py creates Volumes and VolumeNodes based on underlying devices.

In addition, the layers underneath device-aggregator operate under a poll-based model, but it doesn't need to as everything up to device-aggregator is push based.

Due to these many moving layers, there have been some tricky to diagnose and resolve issues that appear in the existing poll based layers (devices not updating as expected).

Instead of continuing to hunt down sequencing and persistence issues in these layers, the best path forward is to fully realize the device graph as early as possible.

The layers can then look like:

• device-scanner outputs a graph of concrete device types (ScsiDevice, LinuxDeviceNode, Partition, MdRaid, ZfsPool, ZfsDataset, ZfsPartition, LvmGroup, LvmVolume) all descendants of some form of a Root struct. It also resolves if any of these devices are currently mounted, their mount point, and the mounted fs type.
• device-aggregator merges these graphs under a Cluster struct, and inserts ZfsPool and LvmGroup to other host graphs if all their backing devices are present in that graph.
• linux.py and resource_manager.py will not need to be used directly, but they will need to stay around to account for upgrade scenarios where only some agents have been upgraded.

Further simplifications and enhancements can then flow from this:

• Discovering existing filesystems can be derived by traversing the graph for selected hosts that contain Lustre mounts.
• Cluster wide device graphs can be easily visualized using both d3 (https://www.jasondavies.com/collatz-graph/), and in a tabular drill-down format.
• near-realtime alerts of persistent storage going offline can be generated.

Account for local mounts using uuid

Utilize the -e flag with findmnt to evaluate tags to device names.

That way, if a mount is created using a tag, it will be converted to a device name.

Aggregator should be outputting Lustre local mounts

look at d5657d6#diff-72e9ab34790f43c7f5abe8361f2e3c55R36 illustrates the issue, input fixture from device scanner lists Lustre mounts in localMounts, but the aggregate output for that host doesn't contain the reference in local_fs.

The issue is that they are being filtered within parseLocalFs within the list.choose function because the path look up fails.

UNIX socket fails from time to time

When scanning for file systems, from time to time in device-scanner.service log I see following:

Apr 25 23:42:37 oss1 systemd[1]: Started IML Device Scanner Daemon.
Apr 25 23:42:37 oss1 systemd[1]: Starting IML Device Scanner Daemon...
Apr 25 23:45:36 oss1 node[1528]: Unexpected socket error: write EPIPE
Apr 25 23:45:36 oss1 node[1528]: trace: Error: write EPIPE
Apr 25 23:45:36 oss1 node[1528]: at _errnoException (util.js:1022:11)
Apr 25 23:45:36 oss1 node[1528]: at WriteWrap.afterWrite [as oncomplete] (net.js:867:14)
Apr 25 23:49:55 oss1 node[1528]: Unexpected socket error: write EPIPE
Apr 25 23:49:55 oss1 node[1528]: trace: Error: write EPIPE
Apr 25 23:49:55 oss1 node[1528]: at _errnoException (util.js:1022:11)
Apr 25 23:49:55 oss1 node[1528]: at WriteWrap.afterWrite [as oncomplete] (net.js:867:14)

I can't figure out what causes this. Besides, upstream version seems to use different language but does not submitted with production packages. I used iml-device-scanner-2.2.0-198.el7.x86_64.
Can you give me a hit on what's wrong?

Scanning seems to stuck after this event and always fails by timeout.

Improve connection handling within device-aggregator

Since the improvements in #203 , movement towards a connection oriented approach similar to that seen in the device-scanner can be made in the device-aggregator. This would basically involving developing the view that gets processed by the application update method so that the connection is not closed internally but is instead closed by the consumer.

Munge data in aggregator

Instead of munging device trees together in:

https://github.com/intel-hpdd/intel-manager-for-lustre/blob/79c9961af61b2991c38c7626f5d665c12dd51359/chroma-manager/chroma_core/plugins/block_devices.py#L1-L559

Perform the munging in the device-aggregator.

By doing this we can make sure the munging is typesafe and syncs with any upstream changes in device-scanner.

Issue info update command after connecting to device-scanner socket

Now the scanner-proxy is integrated into the device-scanner project this work should be done in this repo.

After installation during deployment of chroma-agent the proxy does not send initial update if there is no events triggering device-scanner output.

Send info update commands on socket after connect to send initial update to device-

Handle EPIPE errors

We should handle EPIPE errors as a special case and disconnect the client when we see them

Solve connection handling

There are a few different scenarios to support with v1 backcompat:

1. Someone installs device-scanner [email protected]. Their chroma-agent will write {"ACTION": "info"} to the socket and then half-close it immediately.
2. Someone installs device-scanner at or past [email protected]. They use scanner-proxy to maintain a persistent connection, that first writes "Info"\n at startup.

In addition, the listeners for Udev and ZED will write changes to the device-scanner, they use a connection that can end immediately after writing (they don't even wait for a connection to device-scanner, they just write their data to the unix domain socket and exit).

The current way of modeling this is with Persistent and Ephemeral connections. a V2 Info command is Persistent, everything else is Ephemeral. However, this abstraction doesn't solve the problem, as the V1 command gets lumped in with all the listener commands. Because of this, it's not possible to know what type of data each connection expects, and the result is connections will get data fed to them based on the type of the last connected socket.

To solve this, we need to move the query side closer to the connection.

The rules should be:

1. a V1 info request gets a V1 info response
2. a V2 info request gets a V2 info response
3. everything else gets no response as they are just feeding new data.

Filter pools / datasets that are empty

In:

device-scanner/IML.DeviceAggregatorDaemon/src/Handlers.fs

Line 56 in 3b83254

Set.isSubset poolPaths hostPaths

We check for poolPaths that are a subset of paths on a host. However we don't account for the fact that an empty set is a subset of all sets.

Fix this.

Figure out upgrade path for iml-device-scanner.

Given the difficulty of switching major versions with RPM packages, look at what needs to be done to make the device-scanner backwards compatible with the 1.x release.

• Handle half-open sockets from Python.
• Don't wait for connection to be established to write to unix domain socket.
• Handle or flush stale data coming from ZED.