Add check for WriteThrough

[glensc]

Add check for WriteThrough

[glensc]

i don't have time to work on this right now, but you should provide test data anyway so it could be developed later. and of course patches welcome if you have some code ready already :)

please see CONTRIBUTING.md how to provide data for test inputs.

[glensc]

@dupondje need test data to even start developing this!

[glensc]

(internal note: grus has same raid)

[dupondje]

MegaCli -LDInfo -Lall -aALL

Adapter 0 -- Virtual Drive Information:
Virtual Disk: 0 (target id: 0)
Name:
RAID Level: Primary-5, Secondary-0, RAID Level Qualifier-3
Size:696960MB
State: Optimal
Stripe Size: 64kB
Number Of Drives:6
Span Depth:1
Default Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAheadNone, Direct, No Write Cache if Bad BBU
Access Policy: Read/Write
Disk Cache Policy: Disk's Default

The default policy asks for WriteBack, but the Current policy is WriteThrough.
In fact both lines should show the same.

Default Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAheadNone, Direct, No Write Cache if Bad BBU

In this case there is some issue, cause we ask WriteBack, but current policy is WriteThrough.

Let me know if you need additional information.

[glensc]

you did not provide output of all commands, from existing tests i see pdlist and ldinfo commands are run, also maybe battery depending on system. please see contributing.md how to provide test data!

[dupondje]

perl check_raid.pl -d

DEBUG EXEC: /proc/mdstat at check_raid.pl line 435.
DEBUG EXEC: /usr/bin/MegaCli64 -PDList -aALL -NoLog at check_raid.pl line 435.
DEBUG EXEC: /usr/bin/MegaCli64 -LdInfo -Lall -aALL -NoLog at check_raid.pl line 435.
OK: megacli:[Volumes(1): DISK0.0:Optimal; Devices(6): 00,01,02,03,04,05=Online]

Adapter #0

Enclosure Device ID: 32
Slot Number: 0
Drive's postion: DiskGroup: 0, Span: 0, Arm: 0
Enclosure position: 0
Device Id: 0
WWN: 5000C500288CAEC4
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SAS
Raw Size: 419.186 GB [0x3465f870 Sectors]
Non Coerced Size: 418.686 GB [0x3455f870 Sectors]
Coerced Size: 418.625 GB [0x34540000 Sectors]
Firmware state: Online, Spun Up
Device Firmware Level: ES64
Shield Counter: 0
Successful diagnostics completion on :  N/A
SAS Address(0): 0x5000c500288caec5
SAS Address(1): 0x0
Connected Port Number: 0(path0) 
Inquiry Data: SEAGATE ST3450857SS     ES643SK1NLYN            
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Needs EKM Attention: No
Foreign State: None 
Device Speed: Unknown 
Link Speed: Unknown 
Media Type: Hard Disk Device
Drive Temperature :35C (95.00 F)
PI Eligibility:  No 
Drive is formatted for PI information:  No
PI: No PI
Drive's write cache : Disabled
Port-0 :
Port status: Active
Port's Linkspeed: Unknown 
Port-1 :
Port status: Active
Port's Linkspeed: Unknown 
Drive has flagged a S.M.A.R.T alert : No



Enclosure Device ID: 32
Slot Number: 1
Drive's postion: DiskGroup: 0, Span: 0, Arm: 1
Enclosure position: 0
Device Id: 1
WWN: 5000C500288C96F4
Sequence Number: 2
Media Error Count: 3
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SAS
Raw Size: 419.186 GB [0x3465f870 Sectors]
Non Coerced Size: 418.686 GB [0x3455f870 Sectors]
Coerced Size: 418.625 GB [0x34540000 Sectors]
Firmware state: Online, Spun Up
Device Firmware Level: ES64
Shield Counter: 0
Successful diagnostics completion on :  N/A
SAS Address(0): 0x5000c500288c96f5
SAS Address(1): 0x0
Connected Port Number: 1(path0) 
Inquiry Data: SEAGATE ST3450857SS     ES643SK1MYJN            
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Needs EKM Attention: No
Foreign State: None 
Device Speed: Unknown 
Link Speed: Unknown 
Media Type: Hard Disk Device
Drive Temperature :33C (91.40 F)
PI Eligibility:  No 
Drive is formatted for PI information:  No
PI: No PI
Drive's write cache : Disabled
Port-0 :
Port status: Active
Port's Linkspeed: Unknown 
Port-1 :
Port status: Active
Port's Linkspeed: Unknown 
Drive has flagged a S.M.A.R.T alert : No



Enclosure Device ID: 32
Slot Number: 2
Drive's postion: DiskGroup: 0, Span: 1, Arm: 0
Enclosure position: 0
Device Id: 2
WWN: 5000C50047C4BD24
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SAS
Raw Size: 419.186 GB [0x3465f870 Sectors]
Non Coerced Size: 418.686 GB [0x3455f870 Sectors]
Coerced Size: 418.625 GB [0x34540000 Sectors]
Firmware state: Online, Spun Up
Device Firmware Level: ES65
Shield Counter: 0
Successful diagnostics completion on :  N/A
SAS Address(0): 0x5000c50047c4bd25
SAS Address(1): 0x0
Connected Port Number: 2(path0) 
Inquiry Data: SEAGATE ST3450857SS     ES656SK1ACPY            
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Needs EKM Attention: No
Foreign State: None 
Device Speed: Unknown 
Link Speed: Unknown 
Media Type: Hard Disk Device
Drive Temperature :36C (96.80 F)
PI Eligibility:  No 
Drive is formatted for PI information:  No
PI: No PI
Drive's write cache : Disabled
Port-0 :
Port status: Active
Port's Linkspeed: Unknown 
Port-1 :
Port status: Active
Port's Linkspeed: Unknown 
Drive has flagged a S.M.A.R.T alert : No



Enclosure Device ID: 32
Slot Number: 3
Drive's postion: DiskGroup: 0, Span: 1, Arm: 1
Enclosure position: 0
Device Id: 3
WWN: 5000C50047C530F0
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SAS
Raw Size: 419.186 GB [0x3465f870 Sectors]
Non Coerced Size: 418.686 GB [0x3455f870 Sectors]
Coerced Size: 418.625 GB [0x34540000 Sectors]
Firmware state: Online, Spun Up
Device Firmware Level: ES65
Shield Counter: 0
Successful diagnostics completion on :  N/A
SAS Address(0): 0x5000c50047c530f1
SAS Address(1): 0x0
Connected Port Number: 3(path0) 
Inquiry Data: SEAGATE ST3450857SS     ES656SK1BPCJ            
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Needs EKM Attention: No
Foreign State: None 
Device Speed: Unknown 
Link Speed: Unknown 
Media Type: Hard Disk Device
Drive Temperature :35C (95.00 F)
PI Eligibility:  No 
Drive is formatted for PI information:  No
PI: No PI
Drive's write cache : Disabled
Port-0 :
Port status: Active
Port's Linkspeed: Unknown 
Port-1 :
Port status: Active
Port's Linkspeed: Unknown 
Drive has flagged a S.M.A.R.T alert : No



Enclosure Device ID: 32
Slot Number: 4
Drive's postion: DiskGroup: 0, Span: 2, Arm: 0
Enclosure position: 0
Device Id: 4
WWN: 5000C50047C401A0
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SAS
Raw Size: 419.186 GB [0x3465f870 Sectors]
Non Coerced Size: 418.686 GB [0x3455f870 Sectors]
Coerced Size: 418.625 GB [0x34540000 Sectors]
Firmware state: Online, Spun Up
Device Firmware Level: ES65
Shield Counter: 0
Successful diagnostics completion on :  N/A
SAS Address(0): 0x5000c50047c401a1
SAS Address(1): 0x0
Connected Port Number: 4(path0) 
Inquiry Data: SEAGATE ST3450857SS     ES656SK1CK90            
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Needs EKM Attention: No
Foreign State: None 
Device Speed: Unknown 
Link Speed: Unknown 
Media Type: Hard Disk Device
Drive Temperature :36C (96.80 F)
PI Eligibility:  No 
Drive is formatted for PI information:  No
PI: No PI
Drive's write cache : Disabled
Port-0 :
Port status: Active
Port's Linkspeed: Unknown 
Port-1 :
Port status: Active
Port's Linkspeed: Unknown 
Drive has flagged a S.M.A.R.T alert : No



Enclosure Device ID: 32
Slot Number: 5
Drive's postion: DiskGroup: 0, Span: 2, Arm: 1
Enclosure position: 0
Device Id: 5
WWN: 5000C50043AC7D6C
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SAS
Raw Size: 419.186 GB [0x3465f870 Sectors]
Non Coerced Size: 418.686 GB [0x3455f870 Sectors]
Coerced Size: 418.625 GB [0x34540000 Sectors]
Firmware state: Online, Spun Up
Device Firmware Level: ES64
Shield Counter: 0
Successful diagnostics completion on :  N/A
SAS Address(0): 0x5000c50043ac7d6d
SAS Address(1): 0x0
Connected Port Number: 5(path0) 
Inquiry Data: SEAGATE ST3450857SS     ES646SK1A9T4            
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Needs EKM Attention: No
Foreign State: None 
Device Speed: Unknown 
Link Speed: Unknown 
Media Type: Hard Disk Device
Drive Temperature :36C (96.80 F)
PI Eligibility:  No 
Drive is formatted for PI information:  No
PI: No PI
Drive's write cache : Disabled
Port-0 :
Port status: Active
Port's Linkspeed: Unknown 
Port-1 :
Port status: Active
Port's Linkspeed: Unknown 
Drive has flagged a S.M.A.R.T alert : No




Exit Code: 0x00

Adapter 0 -- Virtual Drive Information:
Virtual Drive: 0 (Target Id: 0)
Name                :
RAID Level          : Primary-1, Secondary-3, RAID Level Qualifier-0
Size                : 1.225 TB
Mirror Data         : 1.225 TB
State               : Optimal
Strip Size          : 64 KB
Number Of Drives per span:2
Span Depth          : 3
Default Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU
Current Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU
Default Access Policy: Read/Write
Current Access Policy: Read/Write
Disk Cache Policy   : Disk's Default
Encryption Type     : None
Is VD Cached: No

[glensc]

i think it makes sense do alert if Cache Policy is not same as Default and Current:

Default Cache Policy: WriteBack, ReadAheadNone, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAheadNone, Cached, No Write Cache if Bad BBU

So if Current policy is WriteThrough, but Default policy is also WriteThrough then do not alert