January 9, 20242 yr Community Expert That makes sens. If there wasn't a correcting parity check or parity rebuild after these hardware problems started, then probably parity is mostly valid, and disk1 emulation could just be unmountable because nothing can be read due to hardware problems.
January 9, 20242 yr Author Ok, so sounds like there's no harm in starting it with Parity Valid checked, doing a check, and then if there's issues doing a full parity sync? Just want to be super sure before I click the button Thanks!
January 9, 20242 yr Community Expert Yes, do it that way. After parity check has been running for a little while or if there are obvious problems post new diagnostics.
January 10, 20242 yr Community Expert If it's still detecting a lot of sync errors, it may be faster to re-sync parity.
January 10, 20242 yr Author Just for clarity and not wanting to screw anything up... Re-sync is clicking Check with "Write corrections to parity" checked?
January 10, 20242 yr Community Expert To re-sync parity, instead of finishing the parity check, you'd need to stop the array, unassign both parity drives, start array, stop array, re-assign both parity drives, start array, a parity sync would begin from the beginning, but if you are getting a lot of sync errors, the sync speed should be much better than 20MB/s, assuming no bottlenecks, so it would be quicker.
January 10, 20242 yr Author Glad I asked! Thank you both so much for your patience and guidance Hopefully I can report back with good news in a few days, but my preliminary inspection of Data Disk 1 there is no data loss or corruption.
January 16, 20242 yr Author That was a long week, but we got there. First re-sync, on day 3 within 12 hours of completion the power went out in that big snow storm we had for like 30 seconds and I had to restart it, this last time we made it through successfully this morning. Conclusion: the original cause of the issues/failure was the UPS' not functioning properly and still causing a power loss when there was a power sag. So the server stayed powered on (plugged directly into the wall), but the drive units powered off because of the UPS shutting down momentarily during the power sag. Time to get a much bigger UPS I guess! Thank you folks!
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