Disabling the prefetcher nukes read performance. I had the same performance before. Faster writes than reads, enabling the prefetcher fixed that right up.
I didn't dare as the sparing to replace ad14 acted on the online ad14.
I belive if i messed with ad14 i would have offlined one of the two remaining good drives in the vdev. I don't know what happened with ad18, the drive that became a "ghost" ad14.
I will have to run diags next week...
The solution is to add a spare and mirror the duplicate device, drop the original, add a second drive and zpool replace the duplicate ghost device. Takes a few hours but the array is now ONLINE.
Hello
My ZFS pool has become degraded and im having difficulties recovering.
NAME STATE READ WRITE CKSUM
storage DEGRADED 0 0 0
raidz1 DEGRADED 0 0 0
ad2 ONLINE 0 0 0
ad14...
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