I noticed today that two of my drives are marked as disabled. One of them is a parity drive, the other is a data drive in the array. I am running dual parity. I am looking for advice on properly assessing whether my drives are faulty and needing to be replaced. I ran short SMART tests on both drives and that came back normal. Also of note, I have two extra drives that are currently in the array but empty, so I could repurpose these to replace the two disabled drives if they are bad. If I need to do that, what order would be best to tackle this? Party or data drive first?

 

I have not had a drive failure before in unraid, so I don't want to take any uneducated steps that could permanently lose data. 

 

Edited July 21, 20232 yr by rangusT

Diags are after rebooting so we can't what happened, but the disks look OK, emulated disk is mounting so assuming contents look correct you can rebuild on top.

 

https://wiki.unraid.net/Manual/Storage_Management#Rebuilding_a_drive_onto_itself

Unfortunately I didn't think to grab diagnostics before shutting down the system.

 

In the main tab there were counts in the errors column on the affected drives. I want to say between 4-5000 on the parity2 and a few hundred on disk5. I'm assuming these errors triggered the disable.

 

If I do a rebuild on top, which way would be safest? Parity first, or data drive first? Would it make sense to use one of the empty drives to rebuild into rather than on top of the existing drives?

 

 

You can do both at the same time, since they are already disabled it's not safer to rebuild just one, on the contrary.

I started the rebuild as you suggested. Now, a different disk is throwing a significant number of errors. I attached diagnostics.

 

Edited July 21, 20232 yr by rangusT

Disk dropped offline, this is usually a power/connection problem, cancel the rebuild, check/replace cables/PSU and try again.