From: Gonzalo Gomez-Arrue Azpiazu <ggomarr@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: Fwd: Unable to mount degraded RAID5
Date: Wed, 6 Jul 2016 20:12:20 +0300 [thread overview]
Message-ID: <CAFDLS-AA6nYJy6BBRPhqAL-7PpA-TTEUqpjLR2+cZ05A+5kx7A@mail.gmail.com> (raw)
In-Reply-To: <CAFDLS-CtnVDtD8d=Wtp0tVokKJ6pjptpX7MR862dThBJvSPC5g@mail.gmail.com>
Hello,
I had a RAID5 with 3 disks and one failed; now the filesystem cannot be mounted.
None of the recommendations that I found seem to work. The situation
seems to be similar to this one:
http://www.spinics.net/lists/linux-btrfs/msg56825.html
Any suggestion on what to try next?
Thanks a lot beforehand!
sudo btrfs version
btrfs-progs v4.4
uname -a
Linux ubuntu 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC
2016 x86_64 x86_64 x86_64 GNU/Linux
sudo btrfs fi show
warning, device 2 is missing
checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074
checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074
bytenr mismatch, want=2339175972864, have=65536
Couldn't read chunk root
Label: none uuid: 495efbc6-2f62-4cd7-962b-7ae3d0e929f1
Total devices 3 FS bytes used 1.29TiB
devid 1 size 2.73TiB used 674.03GiB path /dev/sdc1
devid 3 size 2.73TiB used 674.03GiB path /dev/sdd1
*** Some devices missing
sudo mount -t btrfs -o ro,degraded,recovery /dev/sdc1 /btrfs
mount: wrong fs type, bad option, bad superblock on /dev/sdc1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
dmesg | tail
[ 2440.036368] BTRFS info (device sdd1): allowing degraded mounts
[ 2440.036383] BTRFS info (device sdd1): enabling auto recovery
[ 2440.036390] BTRFS info (device sdd1): disk space caching is enabled
[ 2440.037928] BTRFS warning (device sdd1): devid 2 uuid
0c7d7db2-6a27-4b19-937b-b6266ba81257 is missing
[ 2440.652085] BTRFS info (device sdd1): bdev (null) errs: wr 1413, rd
362, flush 471, corrupt 0, gen 0
[ 2441.359066] BTRFS error (device sdd1): bad tree block start 0 833766391808
[ 2441.359306] BTRFS error (device sdd1): bad tree block start 0 833766391808
[ 2441.359330] BTRFS: Failed to read block groups: -5
[ 2441.383793] BTRFS: open_ctree failed
sudo btrfs restore /dev/sdc1 /bkp
warning, device 2 is missing
checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074
checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074
bytenr mismatch, want=2339175972864, have=65536
Couldn't read chunk root
Could not open root, trying backup super
warning, device 2 is missing
warning, device 3 is missing
checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074
checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074
bytenr mismatch, want=2339175972864, have=65536
Couldn't read chunk root
Could not open root, trying backup super
warning, device 2 is missing
warning, device 3 is missing
checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074
checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074
bytenr mismatch, want=2339175972864, have=65536
Couldn't read chunk root
Could not open root, trying backup super
sudo btrfs-show-super -fa /dev/sdc1
http://sebsauvage.net/paste/?d79e9e9c385cf1a5#fNwoEj5o2aQ6T7nDl4vjrFqEJG0SHeVpmGknbbCVnd0=
sudo btrfs-find-root /dev/sdc1
warning, device 2 is missing
Couldn't read chunk root
Open ctree failed
next parent reply other threads:[~2016-07-06 17:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAFDLS-CtnVDtD8d=Wtp0tVokKJ6pjptpX7MR862dThBJvSPC5g@mail.gmail.com>
2016-07-06 17:12 ` Gonzalo Gomez-Arrue Azpiazu [this message]
2016-07-06 18:19 ` Unable to mount degraded RAID5 Chris Murphy
2016-07-07 12:24 ` Gonzalo Gomez-Arrue Azpiazu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAFDLS-AA6nYJy6BBRPhqAL-7PpA-TTEUqpjLR2+cZ05A+5kx7A@mail.gmail.com \
--to=ggomarr@gmail.com \
--cc=linux-btrfs@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).