Erasmus

I'm now pretty sure you're right and it was a power/connection issue. I don't know what the issue was... I had already tried re-seating all the cables and it hadn't helped, but I did it again and it's now happily rebuilding the parity drives so I guess we'll all good! Or rebooting just happened to fix the issue, I guess, but human error seems more likely. Thanks for the suggestions everyone!

Hi all! On my server both parity drives have simultaneously failed. Though it's possible it's hardware and both drives happened to fail at the same time, that seems unlikely to me, especially since they're the newest drives in the server... but it's always possible the server was physically jostled or something. I've tried removing them both from the array and re-adding them both individually and together, and swapping parity 1 and 2, but it always fails in the parity rebuild. It then does a read check, which passes. Both drives pass SMART tests, though honestly I don't know how meaningful that is. The rebuild seems to fail at a different point as well, sometimes getting several million writes on the parity drives, sometimes only a few thousand. Any clues as to how to diagnose this, or confirm the drives have actually failed would be appreciated. Thanks