ZFS pool faulted (corrupt metadata) but the disk data appears ok...

[Ben RUBSON]

On 02 Feb 2018 21:48, Michelle Sullivan wrote:

> Ben RUBSON wrote:
>
>> So disks died because of the carrier, as I assume the second unscathed  
>> server was OK...
>
> Pretty much.
>
>> Heads must have scratched the platters, but they should have been  
>> parked, so... Really strange.
>
> You'd have thought... though 2 of the drives look like it was wear and  
> wear issues (the 2 not showing red lights) just not picked up on the  
> periodic scrub....  Could be that the recovery showed that one up... you  
> know - how you can have an array working fine, but one disk dies then  
> others fail during the rebuild because of the extra workload.

Yes... To try to mitigate this, when I add a new vdev to a pool, I spread  
the new disks I have among the existing vdevs, and construct the new vdev  
with the remaining new disk(s) + other disks retrieved from the other  
vdevs. Thus, when possible, avoiding vdevs with all disks at the same  
runtime.
However I only use mirrors, applying this with raid-Z could be a little bit  
more tricky...

Ben