I just need some advice on how to proceed in my situation.

My curious son detached one of the drive bays in my server while the unraid array was running. This caused unraid to drop one of my 12TB drives from the array and contents of the missing drive to be emulated. I re-attached the drive to the array and parity sync started to reconstruct this data disk again. During parity sync one of my other drives started to throw errors and parity sync halted.

Now this 6TB drive has not completely failed. it is still online.

So i was thinking of just creating a new config, mark the parity as good. Then take the array offline, and swap the failed 6TB drive with a new one and rebuild.

I was thinking that even if some files where rebuild corrupted i could maybe salvage that file from the failing 6TB drive.

Is this a good approach? or are there any other suggestions?

Please post the diagnostics.

Diagnostics attached. It seems the 6TB is being dropped by the controller during parity sync. I thought the drive was still accessible but it was only cached directory and file listings.

After the diagnostics i rebooted and the 6TB was gone. Reseated the power and sata connector and drive is found again. Not sure if it's the cabling or the controller.

It seems the 6TB is still good. Restarted the server and the entire disk was missing, reconnected the cabling and restarted and the drive is seen again.

Running parity sync again. Hopefully it doesnt fail again mid sync.

unraid-diagnostics-20251025-1040.zip

It's not logged as a disk problem, so most likely a power/connection issue.

Great, that is fortunate. That is something easily fixed. I'll look into replacing the cabling and PSU if the problem occurs again.

Thanks for having a look.