On 02/28/2016 01:17 PM, Marc MERLIN wrote:
On Sun, Feb 28, 2016 at 09:44:36AM +0800, Anand Jain wrote:
If you have a choice pls add, 'btrfs fi show -d' as well for the outputs
to be taken at the time of boot just before system's 'btrfs dev scan',
Ok, I had to reboot anyway, so here's the state when it's bad:
gargamel:~# btrfs fi show -d
Label: 'btrfs_boot' uuid: e4c1daa8-9c39-4a59-b0a9-86297d397f3b
Total devices 1 FS bytes used 43.52GiB
devid 1 size 79.93GiB used 62.13GiB path /dev/mapper/cryptroot
Label: 'dshelf2' uuid: d4a51178-c1e6-4219-95ab-5c5864695bfd
Total devices 1 FS bytes used 4.27TiB
devid 1 size 7.28TiB used 4.44TiB path /dev/mapper/dshelf2
Label: 'btrfs_space' uuid: 01334b81-c0db-4e80-92e4-cac4da867651
Total devices 2 FS bytes used 1.09TiB
devid 1 size 836.13GiB used 641.03GiB path /dev/mapper/raid0d1
devid 2 size 836.13GiB used 641.03GiB path /dev/mapper/raid0d2
Label: 'dshelf1' uuid: 5d0847f8-b243-494a-9e31-0a7c9adbd764
Total devices 1 FS bytes used 8.88TiB
devid 1 size 21.83TiB used 8.92TiB path /dev/bcache1
gargamel:~# mount /var/local/space
mount: wrong fs type, bad option, bad superblock on /dev/mapper/raid0d1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
[ 3209.752862] BTRFS info (device dm-6): disk space caching is enabled
[ 3209.775418] BTRFS: failed to read the system array on dm-6
[ 3209.807673] BTRFS: open_ctree failed
blkid shows:
/dev/mapper/raid0d1: LABEL="btrfs_space" UUID="01334b81-c0db-4e80-92e4-cac4da867651" UUID_SUB="a87c0954-e0d5-4cdb-acb9-05ed290c16df" TYPE="btrfs"
/dev/mapper/raid0d2: LABEL="btrfs_space" UUID="01334b81-c0db-4e80-92e4-cac4da867651" UUID_SUB="b4ea90fa-4262-489a-830d-3bd4e7518ff2" TYPE="btrfs"
but mount fails.
And then:
gargamel:~# btrfs dev scan
Scanning for Btrfs filesystems
gargamel:~# mount /var/local/space
gargamel:~#
Does this make any sense to you?
Not really. Here we are trying to understand why the first 'btrfs dev
scan' doesn't help. And, as I understand the first 'btrfs dev scan' is
during boot up by some system'd script. But the above output seems to
be taken from the terminal which is after the system has booted up.
That does not help. We need those commands output during the bootup
at the time and just before when systemd issues 'btrfs dev scan'.
Hope I sound clearer now, sorry if it wasn't before.
Thanks, Anand
Thanks,
Marc
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