$ uname -a
Linux thejay-srv03 4.0.0-040000-generic #201504121935 SMP Sun Apr 12
23:36:33 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
$ btrfs --version
btrfs-progs v3.19.1
$ sudo btrfs fi show
Label: 'roms03' uuid: b0025417-4045-4c63-a432-0625b7cc41ea
Total devices 4 FS bytes used 2.67TiB
devid 1 size 1.36TiB used 1.36TiB path /dev/sdz
devid 3 size 1.36TiB used 1.36TiB path /dev/sdaa
devid 4 size 1.36TiB used 1.36TiB path /dev/sdab
*** Some devices missing
This pool is a btrfsraid6 pool
when trying to mount I get:
$ sudo mount -t btrfs -o recovery,ro /dev/sdaa /mnt/roms03
mount: wrong fs type, bad option, bad superblock on /dev/sdaa,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
$ dmesg -T|tail
[Mon May 4 08:35:08 2015] BTRFS info (device sdz): enabling auto recovery
[Mon May 4 08:35:08 2015] BTRFS info (device sdz): disk space caching is
enabled
[Mon May 4 08:35:08 2015] BTRFS: has skinny extents
[Mon May 4 08:35:08 2015] BTRFS: failed to read chunk tree on sdz
[Mon May 4 08:35:08 2015] BTRFS: open_ctree failed
What could I try to see if I can mount this pool and gain access to the
data?
While I have a backup of the data, next time I may not, and I am trying
to learn how to go about.
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