On 04.09.2019 07:36, Chris Murphy wrote:
I have tried all the mount / restore options listed here:
https://forums.unraid.net/topic/46802-faq-for-unraid-v6/page/2/?tab=comments#comment-543490
Good. Stick with ro attempts for now. Including if you want to try a
newer kernel. If it succeeds to mount ro, my advice is to update
backups so at least critical information isn't lost. Back up while you
can. Any repair attempt makes changes that will risk the data being
permanently lost. So it's important to be really deliberate about any
changes.
I'll let you know, when I have the new kernel up and running.
I think you should have all the original drives installed, and try to
mount -o ro first. And if that doesn't work, try -o ro,degraded, and
then we'll just have to see which drive it doesn't like.
Things are finally looking up. I have replaced both sdb and sdf with
ddrescue'd copies. sdb had some 10MB bad sectors and sdf 8KB which could
not be recovered.
I am now able to mount the volume again. :)
btrfsck /dev/sda1
Opening filesystem to check...
Checking filesystem on /dev/sda1
UUID: 108df6ea-2846-4a88-8a50-61aedeef92b4
[1/7] checking root items
checksum verify failed on 34958760591360 found E4E3BDB6 wanted 00000000
checksum verify failed on 34958760591360 found E4E3BDB6 wanted 00000000
parent transid verify failed on 34958760591360 wanted 3331734 found 1544337
checksum verify failed on 34958760591360 found 04DEBA71 wanted B9FBE54D
checksum verify failed on 34958760591360 found 04DEBA71 wanted B9FBE54D
bad tree block 34958760591360, bytenr mismatch, want=34958760591360,
have=27967614209536
ERROR: failed to repair root items: Input/output error
Anyway, I am about to mount it read-only again to try and backup a few
things. And once I am done with that, should I run btrfs scrub?
Kind regards,
Edmund
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