BTRFS mounted on BTRFS shows the top most filesystem

[knorrie]

BTRFS mounted on BTRFS shows the top most filesystem

[knorrie]

Hi, thanks for trying btrfs-heatmap!

Are you sure that it's not the same filesystem? Can you share the output of grep btrfs /proc/self/mounts?

[dewitpj]

Hi,

Sorry for the delay:

/dev/sdb1 /srv btrfs rw,relatime,space_cache,autodefrag,subvolid=5,subvol=/ 0 0
/dev/sdc1 /srv/temp btrfs rw,relatime,space_cache,subvolid=5,subvol=/ 0 0

[knorrie]

And some more debugging? What does btrfs fi show say?

And if you do this in a python3 session?

>>> import btrfs
>>> btrfs.FileSystem('/srv').fsid
UUID('b9c720e3-c839-4e0b-b708-563d7b424290')  <- will show some different uuid for you
>>> btrfs.FileSystem('/srv/temp').fsid
UUID('7cc60652-cb82-4c13-81c0-6ca221e4e62e') <- and this should show a different one again

I'd really expect these two uuids to be different.

And, if you run those exact btrfs-heatmap commands with the option -v, and without the -o option, does it generate two pictures with the same filesystem uuid in the name?

[dewitpj]

wow - ok - very sorry about this....seems something got crossed over somewhere - turns out that I was using /srv/temp and I should have used /srv/some_other_name

Again, very sorry :(

[knorrie]

Ok, no problem, good to hear you figured it out. :) Have fun creating pictures.