ZFS RaidZ-2 problems

[Dennis Glatting]

On Tue, 2012-10-30 at 14:37 +0000, Paul Wootton wrote:
> On 10/30/12 12:04, Dennis Glatting wrote:
> > I've had this problem too. Here is what I can tell you for my case. 
> > ... I replaced the card, the cable, and the disks themselves leaving 
> > only one other possibility -- the power supply. The faulting array was 
> > on a separate cable from the power supply. I replaced the power 
> > supply, going from a 1,000W to 1,300W, and the power cables to the 
> > disks. Not a problem since.
> 
> While I can accept that I might have a bad power supply. or cables, my 
> main concern is that I have only 1 drive showing as "Unavail" on a 
> RAIDZ-2 and the pack is showing "Faulted".
> I would have expected that pack to continue working with 2 bad drives, 
> and would have failed if I had 3rd one fail


I have successfully upgraded arrays by replacing disks in a RAIDz and
RAIDz2 array one at a time, so I know for certain one disk failures work
as expected. I tried replacing two at once in a RAIDz2 array but it did
not succeed; however it was also the array with the bad power supply.
That said, it certainly tried to rebuild the array.