Hello,
My system suddenly decided it did not want to mount my BTRFS setup. I
recently rebooted the computer. When it came back, the file system was
in read only mode. I gave it another boot, but now it does not want to
mount at all. Anything I can do to recover? This is a Rockstor setup
that I have had running for about a year.
uname -a
Linux hobonas 4.10.6-1.el7.elrepo.x86_64 #1 SMP Sun Mar 26 12:19:32
EDT 2017 x86_64 x86_64 x86_64 GNU/Linux
btrfs --version
btrfs-progs v4.10.1
btrfs fi show
Label: 'rockstor_rockstor' uuid: 33e2af57-c30a-468a-9ed5-22994780f6b4
Total devices 1 FS bytes used 5.50GiB
devid 1 size 215.39GiB used 80.02GiB path /dev/sda3
Label: 'Nexus' uuid: 1c3595a9-3faa-4973-affc-ee8d14d922bf
Total devices 5 FS bytes used 3.93TiB
devid 1 size 2.73TiB used 1.12TiB path /dev/sdd
devid 2 size 2.73TiB used 1.12TiB path /dev/sdb
devid 3 size 2.73TiB used 1.12TiB path /dev/sdc
devid 4 size 2.73TiB used 1.12TiB path /dev/sdf
devid 5 size 2.73TiB used 1.12TiB path /dev/sde
dmesg
[ 18.572846] BTRFS: device label Nexus devid 2 transid 595679 /dev/sdb
[ 18.572933] BTRFS: device label Nexus devid 3 transid 595679 /dev/sdc
[ 18.573027] BTRFS: device label Nexus devid 1 transid 595679 /dev/sdd
[ 18.573119] BTRFS: device label Nexus devid 5 transid 595679 /dev/sde
[ 18.573200] BTRFS: device label Nexus devid 4 transid 595679 /dev/sdf
[ 20.846060] device-mapper: uevent: version 1.0.3
[ 20.846114] device-mapper: ioctl: 4.35.0-ioctl (2016-06-23)
initialised: dm-de...@redhat.com
[ 21.073884] BTRFS info (device sdf): use no compression
[ 21.073886] BTRFS info (device sdf): disk space caching is enabled
[ 21.073887] BTRFS info (device sdf): has skinny extents
[ 21.084353] BTRFS error (device sdf): parent transid verify failed
on 8419247390720 wanted 542466 found 485869
[ 21.230919] BTRFS info (device sdf): bdev /dev/sde errs: wr 402545,
rd 234683174, flush 194501, corrupt 0, gen 0
[ 21.794749] BTRFS error (device sdf): parent transid verify failed
on 8939150000128 wanted 594920 found 490791
[ 21.841317] BTRFS error (device sdf): parent transid verify failed
on 8939187814400 wanted 594923 found 490824
[ 21.870392] BTRFS error (device sdf): parent transid verify failed
on 8418984427520 wanted 594877 found 490575
[ 21.951901] BTRFS error (device sdf): parent transid verify failed
on 8939107860480 wanted 594915 found 465207
[ 22.015789] BTRFS error (device sdf): parent transid verify failed
on 8939284430848 wanted 594958 found 465274
[ 22.034840] BTRFS error (device sdf): parent transid verify failed
on 8418907701248 wanted 594869 found 351596
[ 22.070516] BTRFS error (device sdf): parent transid verify failed
on 8939032035328 wanted 594899 found 465175
[ 22.091734] BTRFS error (device sdf): parent transid verify failed
on 8939123818496 wanted 594917 found 490777
[ 22.110531] BTRFS error (device sdf): parent transid verify failed
on 8939121917952 wanted 594917 found 490775
[ 23.393973] BTRFS error (device sdf): failed to read block groups: -5
[ 23.419807] BTRFS error (device sdf): open_ctree failed
mount -t btrfs -o recovery,ro /dev/sdb /mnt2/Nexus
mount: wrong fs type, bad option, bad superblock on /dev/sdb,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
Thanks,
Dan
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