April 2, 201610 yr Hey Guys, My unRaid server recently had a hard poweroff (IE black out), I have just powered it back on and started the shares. However my cache won't come online as one of the drives is showing as un-mountable. Looking at the system log I can see this 8:24:01 Tower kernel: BTRFS (device sdf1): parent transid verify failed on 392242921472 wanted 23966 found 19131 Apr 2 18:24:01 Tower kernel: BTRFS (device sdf1): parent transid verify failed on 392242921472 wanted 23966 found 19131 Apr 2 18:24:01 Tower kernel: BTRFS: failed to read tree root on sdf1 Apr 2 18:24:01 Tower emhttp: mount error: No file system (32) Apr 2 18:24:01 Tower kernel: BTRFS: open_ctree failed On the main page it is suggesting formatting the desk to bring it back online however it mentions all data on this disk will be lost.. The problem appears that this seems to be the disk where all my 's where stored. So my question is there anyway I can recover these VM's without having format this drive? I have attach my system log tower-syslog-20160402-1909.zip
April 2, 201610 yr Author So a little more information to this. When I SSH to the machine the cache direct under mount is missing? Is this because it can't bring up the cache drives because of that missing file system?
April 2, 201610 yr Community Expert Try starting the array in maintenance mode and running: btrfs check --repair /dev/sdf1
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