I have a raidz2 with 8x3tb wd red drives.
The automatic email sending I set up in napp-it doesn't seem to work so I missed that I had a problem with a sata power splitter. Two disks dropped(2 & 3) and was discovered off and on during a period of about two weeks.
I didn't notice this but last night another disk(7) in the raid reported errors and the pool got the status UNAVAIL. I shut the computer down, replaced the faulty power splitter and power it back up.
The status of the pool is still UNAVAIL, the two disks(2 & 3) that had problem with the power splitter one say DEGRADED and one UNAVAIL, the last disk(7) that broke is also UNAVAIL.
Thinking all is lost(18tb data and no backup, yeah I know) I tried clearing the errors of the last disk(7) and when I got the prompt back I ran a status on the pool.
Disk 7 is now ONLINE and 2&3 is resilvering. I left it and came back an hour later to check on the progress. The resilvering is still going but disk 7 is now also resilvering.
How can three disks in a raidz2 resilver at the same time?
Am i screwed or what? I guess I'll find out 91h from now.
status: One or more devices is currently being resilvered. The pool will
continue to function in a degraded state.
action: Wait for the resilver to complete.
Run 'zpool status -v' to see device specific details.
scan: resilver in progress since Fri Jul 4 12:06:17 2014
465G scanned out of 20.0T at 62.1M/s, 91h41m to go
60.2G resilvered, 2.27% done
NAME STATE READ WRITE CKSUM
ARC DEGRADED 0 0 0
raidz2-0 DEGRADED 0 0 0
c10t0d0 ONLINE 0 0 0
c10t1d0 ONLINE 0 0 0
c10t2d0 DEGRADED 0 0 0 (resilvering)
c10t3d0 DEGRADED 0 0 0 (resilvering)
c10t4d0 ONLINE 0 0 0
c10t5d0 ONLINE 0 0 0
c10t6d0 ONLINE 0 0 0
c10t7d0 DEGRADED 0 0 21 (resilvering)
errors: No known data errors