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Tutor

Nov 30, 2019

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I was forced to power off ReadyNAS and now all disks are offline

When ReadyNAS powers on after power off, disks are offline.

This information is in dmesg:

[   18.427668] systemd-journald[1361]: Received request to flush runtime journal from PID 1
[   19.484836] md: md127 stopped.
[   19.486279] md: bind<sdb3>
[   19.486530] md: bind<sdc3>
[   19.486761] md: bind<sdd3>
[   19.486983] md: bind<sda3>
[   19.488890] md/raid:md127: device sda3 operational as raid disk 0
[   19.488898] md/raid:md127: device sdd3 operational as raid disk 3
[   19.488902] md/raid:md127: device sdc3 operational as raid disk 2
[   19.488906] md/raid:md127: device sdb3 operational as raid disk 1
[   19.489778] md/raid:md127: allocated 4362kB
[   19.489900] md/raid:md127: raid level 5 active with 4 out of 4 devices, algorithm 2
[   19.489906] RAID conf printout:
[   19.489910]  --- level:5 rd:4 wd:4
[   19.489914]  disk 0, o:1, dev:sda3
[   19.489918]  disk 1, o:1, dev:sdb3
[   19.489922]  disk 2, o:1, dev:sdc3
[   19.489927]  disk 3, o:1, dev:sdd3
[   19.490151] md127: detected capacity change from 0 to 8986874216448
[   19.832338] BTRFS: device label 5e27553c:data devid 1 transid 27646256 /dev/md127
[   19.900226] Adding 1046524k swap on /dev/md1.  Priority:-1 extents:1 across:1046524k 
[   61.590536] BTRFS error (device md127): parent transid verify failed on 14932132233216 wanted 27646257 found 27643074
[   61.595845] BTRFS error (device md127): parent transid verify failed on 14932132233216 wanted 27646257 found 27643074
[   61.595857] BTRFS warning (device md127): failed to read log tree
[   61.655455] BTRFS error (device md127): open_ctree failed

Is there something can be done to get system online again?

jukkaforss
Dec 01, 2019
I got it back online with this command.

btrfs rescue zero-log /dev/md127

I know it is risky, but that is only option in this case.

3 Replies

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StephenB
Guru - Experienced User
Nov 30, 2019
jukkaforss wrote:

[ 61.590536] BTRFS error (device md127): parent transid verify failed on 14932132233216 wanted 27646257 found 27643074 [ 61.595845] BTRFS error (device md127): parent transid verify failed on 14932132233216 wanted 27646257 found 27643074 [ 61.595857] BTRFS warning (device md127): failed to read log tree [ 61.655455] BTRFS error (device md127): open_ctree failed

Is there something can be done to get system online again?

The data volume's file system is corrupted. Options are to

contact paid support (my.netgear.com). You'll likely need a data recovery contract: https://kb.netgear.com/69/ReadyNAS-Data-Recovery-Diagnostics-Scope-of-Service

Do a factory default on the NAS, reconfigure it, and restore the data from your backup. Obviously not an option if you don't have a backup.

Connect the disks to a Windows PC (either with SATA or with USB adapters/docks) and see if ReclaiMe can find the files. You'd then be able to offload them to other storage. https://www.reclaime.com/
- jukkaforss
  Tutor
  Dec 01, 2019
  I got it back online with this command.
  
  btrfs rescue zero-log /dev/md127
  
  I know it is risky, but that is only option in this case.
  - StephenB
    Guru - Experienced User
    Dec 01, 2019
    jukkaforss wrote:
    
    I got it back online with this command.
    
    btrfs rescue zero-log /dev/md127
    
    I know it is risky, but that is only option in this case.
    
    That's good news, but I wouldn't trust the file system integrity if it were my own system.
    
    I suggest backing up the data, and then doing a factory default. Reconfigure the NAS, and restore the data from the backup.