I have a 4TB drive that failed and am trying to replace it with a new one. My array has one 4tb parity drive(sdc), one healthy 4tb data drive(sdd), the failed drive(sde, which has been replaced with a new one). Where I went wrong was trusting AI to walk me through my situation. I had added a spare 2TB drive to the machine but when I was testing it there were smart errors and so I then removed it. The 4tb drive started to fail catastrophically once the 2tb drive was removed. Chatgpt told me to select "new config" and retain drive assignments, but I'm worried I have now ruined my chance at avoiding data loss on that failed drive. I checked the parity-checks.log in my flash backup download and it stated the last parity check was Sep 1 and was a non correcting parity check. This was before I had added the 2TB drive that had smart errors, and I believe I had not added it to the array. I tried to use ddrescue on the failed drive but only a very small percent of the data was recoverable. The array would not come online with the failed drive, and I have not started it since selecting "new config" and have given up trying to ask AI for help. Any help would be greatly appreciated on what my next steps should be, or any further information about my setup may be required to assist in troubleshooting.

The disk was not formatted or is not being correctly emulated, assuming the latter, it suggests parity is not totally valid. Try running xfs_repair on it, in case it can find a backup superblock: xfs_repair /dev/md2p1

Replacing Failed Drive

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Solved by JorgeB

October 3, 2025Oct 3

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October 3, 2025Oct 3

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1 minute ago, JorgeB said:
Restart the array and post new diags.

here you go, thanks again for your help!

reclaimer-diagnostics-20251003-1203.zip

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October 3, 2025Oct 3

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Emulated disk2 is mounted with plenty of data. Should be OK to rebuild now.

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October 3, 2025Oct 3

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5 minutes ago, trurl said:
Emulated disk2 is mounted with plenty of data. Should be OK to rebuild now.

I just want to confirm I'm doing it right. Stop the array, assign the disk, and then start the array again and Unraid will take care of the rest?

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October 3, 2025Oct 3

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Correct

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Replacing Failed Drive

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Solved by JorgeB

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