Re: One missing device = fs not detected; upgrade things first?

[Andy Smith <andy@strugglers.net>]

Hi Remi,

On Mon, Jan 29, 2024 at 01:24:09PM -0500, Remi Gauvin wrote:
> That is what lsblk output looks like to me.  There is no filesystem
> information in the output.  Are you confusing lsblk and blkid?

Maybe. But see later…

> > Should I build new btrfs-progs and then a new kernel and just boot
> > with those to see what happens, and then try the check --repair? Or
> > should I just build the new kernel and see what that makes of the
> > devices first, then build new btrfs-tools if I am still to run
> > check?
> 
> I would suggest the output of btrfs filesystem show, as well as the
> exact mount command and any dmesg output when mount command is run.

Hmm,. strange. Now:

# btrfs fi sh 
Label: 'tank'  uuid: 472ee2b3-4dc3-4fc1-80bc-5ba967069ceb
	Total devices 7 FS bytes used 3.72TiB
	devid    5 size 2.73TiB used 2.44TiB path /dev/sdj
	devid    6 size 1.82TiB used 1.53TiB path /dev/sdf
	devid    8 size 931.51GiB used 839.00GiB path /dev/sdh
	devid    9 size 931.51GiB used 857.00GiB path /dev/sde
	devid   10 size 1.75TiB used 1.67TiB path /dev/sdg
	devid   12 size 1.75TiB used 548.50GiB path /dev/sdi
	*** Some devices missing

# mount -t btrfs -odegraded /dev/sde /srv/tank

(long pause, but eventually worked)

Logged:

2024-01-29T21:14:01.748805+00:00 specialbrew.localnet kernel: [19014.852866] BTRFS info (device sdj): allowing degraded mounts
2024-01-29T21:14:01.748874+00:00 specialbrew.localnet kernel: [19014.852873] BTRFS info (device sdj): disk space caching is enabled
2024-01-29T21:14:01.768772+00:00 specialbrew.localnet kernel: [19014.866523] BTRFS warning (device sdj): devid 11 uuid 296b4aa0-434d-408e-8b8b-f11d93186a11 is missing
2024-01-29T21:14:01.768772+00:00 specialbrew.localnet kernel: [19014.866523] BTRFS warning (device sdj): devid 11 uuid 296b4aa0-434d-408e-8b8b-f11d93186a11 is missing
2024-01-29T21:14:03.512856+00:00 specialbrew.localnet kernel: [19016.615549] BTRFS info (device sdj): bdev (null) errs: wr 1, rd 0, flush 0, corrupt 0, gen 0

Admittedly I did not try "btrfs filesystem show" before, as the
complete lack of spotting an fs on there, and "btrfs dev scan"
seemingly doing nothing threw me a bit. But I DID try a mount
before, which failed saying it couldn't find a superblock. Yet now
it seems to have worked okay.

Everything seems alright, I just need to work out what happened with
that one drive.

As for lsblk, it now says:

# lsblk
sde                     8:64   0 931.5G  0 disk   
sdf                     8:80   0   1.8T  0 disk   
sdg                     8:96   0   1.8T  0 disk   
sdh                     8:112  0 931.5G  0 disk   
sdi                     8:128  0   1.8T  0 disk   
sdj                     8:144  0   2.7T  0 disk   /srv/tank

but I suppose only because that is now mounted.

Thanks!
Andy