April 8, 20251 yr I just received this message this morning. In addition, I have a parity drive throwing read errors, but apparently not critical (yet). I did try changing the cables to the parity drives, with some spotty results. I've got 4 new (to me) 10 TB hard drives precleared and tested ready to drop in. But, I'm not certain what my steps should be. flunkyland-diagnostics-20250407-1227.zip flunkyland-smart-20250407-1226.zip
April 8, 20251 yr Community Expert Disk20 dropped offline, so there's no SMART, check/replace cables and post new diags after array start. Parity2 is failing and should be replaced ASAP.
April 8, 20251 yr Author 1 hour ago, JorgeB said: Disk20 dropped offline, so there's no SMART, check/replace cables and post new diags after array start. Parity2 is failing and should be replaced ASAP. Can you tell me how you can determine how Parity2 is failing? Is it in the SMART, or part of the larger diagnostics? I'll shut down a bit later and see if I can get disc 20 back on line. If I can, then I'll replace the parity drive (how?}
April 9, 20251 yr Author I shut down, checked the cables and reseated the failed drive 20. After I restarted, drive 20 now says Unassigned and the existing hard drive in that slot does not show as an option. New diagnostics here. flunkyland-diagnostics-20250408-1806.zip
April 9, 20251 yr Community Expert 10 hours ago, Moose_Flunky said: Can you tell me how you can determine how Parity2 is failing? SMART has a failing now attribute, and the read errors are logged as a disk problem. Diag after array start, please, but first swap cables between disk20 and a different disk, and if it still doesn't show up it could be dead.
April 9, 20251 yr Author 21 minutes ago, JorgeB said: SMART has a failing now attribute, and the read errors are logged as a disk problem. Diag after array start, please, but first swap cables between disk20 and a different disk, and if it still doesn't show up it could be dead. A cable swap is not easy since this is a 4U chasis with a SATA backplane. All the drives are hot swap and all slots are currently in use. I don't know how I can move the drive without displacing another drive (which would corrupt the parity, correct?)
April 9, 20251 yr Community Expert 59 minutes ago, Moose_Flunky said: A cable swap is not easy since this is a 4U chasis with a SATA backplane. Just swap slots between two disks, with the array stopped if hot swap is supported by the hardware, or just turn the server off.
April 9, 20251 yr Community Expert 3 hours ago, Moose_Flunky said: (which would corrupt the parity, correct?) Unraid does not care how drives are physically plugged in as it recognises them by their serial number so it is not relevant to parity. The idea is to see whether the issue follows the drive or the slot.
April 9, 20251 yr Author Solution 11 hours ago, itimpi said: Unraid does not care how drives are physically plugged in as it recognises them by their serial number so it is not relevant to parity. The idea is to see whether the issue follows the drive or the slot. Thank you for that bit of information. That really helped. This morning I was able to put drive 20 in another slot and another open SATA port on the board and test it. In both cases it appears to be dead. So, I plugged a new drive into drive 20's slot, selected the new drive ID for drive 20, and Unraid immediately began rebuilding the drive. However, parity2 started throwing errors immediately, so as soon as drive 20 finishes rebuilding, I'm going to replace parity2. Thank you for all of your assistance. After everything is rebuilt, I post a final diagnostic to close the loop
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