Hi,
I had to remove one disk from raid 1 and I rebooted the system and was
able to mount in degraded mode. Then I powered off the system added a
new disk and when I am trying to mount the btrfs filesystem in
degraded mode it will no longer mount it read-write. I can mount
read-only though.
I tried running btrfs-zero-log as well and that gices a core dump.
My system details as follows:
rajeev@NAS:~$ uname -a
Linux NAS 4.4.0-59-generic #80-Ubuntu SMP Fri Jan 6 17:47:47 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux
root@NAS:~# btrfs --version
Btrfs v3.12
root@NAS:~# btrfs fi show
Label: none uuid: f89c12fb-2304-4dce-bed5-fda008b86bde
Total devices 2 FS bytes used 2.49TiB
devid 1 size 2.73TiB used 2.52TiB path /dev/sdb1
*** Some devices missing
Btrfs v3.12
root@NAS:~# mount -o degraded /dev/sdb1 /local/nas
mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
root@NAS:~# dmesg | tail
[ 2506.816795] BTRFS: missing devices(1) exceeds the limit(0),
writeable mount is not allowed
[ 2506.878031] BTRFS: open_ctree failed
[ 4590.339548] BTRFS info (device sdb1): allowing degraded mounts
[ 4590.505739] BTRFS info (device sdb1): bdev /dev/sdb1 errs: wr 0, rd
90, flush 0, corrupt 0, gen 0
[ 4609.481310] BTRFS: missing devices(1) exceeds the limit(0),
writeable mount is not allowed
[ 4609.536509] BTRFS: open_ctree failed
[ 4852.498305] BTRFS info (device sdb1): allowing degraded mounts
[ 4853.294311] BTRFS info (device sdb1): bdev /dev/sdb1 errs: wr 0, rd
90, flush 0, corrupt 0, gen 0
[ 4873.026855] BTRFS: missing devices(1) exceeds the limit(0),
writeable mount is not allowed
[ 4873.083840] BTRFS: open_ctree failed
root@NAS:~# mount -o degraded,ro /dev/sdb1 /local/nas
root@NAS:~# btrfs fi df /local/nas
Data, RAID1: total=2.51TiB, used=2.49TiB
Data, single: total=1.01GiB, used=88.27MiB
System, RAID1: total=8.00MiB, used=352.00KiB
System, single: total=4.00MiB, used=12.00KiB
Metadata, RAID1: total=6.00GiB, used=5.01GiB
Metadata, single: total=8.00MiB, used=3.31MiB
unknown, single: total=512.00MiB, used=0.00
In the read-only mode I am not able to add a new device or replace :(.
Please help.
Thanks,
--
raj
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