Recently replaced a drive and did the data rebuild to write the missing data to the new hard drive. While doing the data rebuild, I noticed a format option and mentioned in support at Discord, continued the data rebuild without formatting. Once the data rebuild was completed, Unraid still says that the disk is unmountable. Currently, the array is in maintenance mode, and I'm doing a check of the disk, and it mentions:

Phase 1 - find and verify superblock...
couldn't verify primary superblock - not enough secondary superblocks with matching geometry !!!

attempting to find secondary superblock...

Support mentioned to make a post here, so here I am. What should I do to resolve this issue?

I added the diagnostics as well as screenshots of what I saw for clarity’s sake.

tower-diagnostics-20251030-2228.zip

Did you do the check filesystem from the webUI? Easy to get the command line wrong for this.

1 minute ago, trurl said:

Did you do the check filesystem from the webUI? Easy to get the command line wrong for this.

I followed the steps (Maintenance Mode, clicking Disk 2 and clicked on Check). No command line was used.

You may have to wait while it searches for secondary superblock.

Do you have another copy of anything important and irreplaceable?

Your syslog seems to indicate problems getting parity correct. If parity isn't correct, the disk can't be emulated for rebuild.

Have you done memtest recently?

2 minutes ago, trurl said:

You may have to wait while it searches for secondary superblock.

Do you have another copy of anything important and irreplaceable?

Your syslog seems to indicate problems getting parity correct. If parity isn't correct, the disk can't be emulated for rebuild.

Have you done memtest recently?

Noted. Hopefully it finds the secondary superblock. If not, most of the stuff has been backed up off-site. I have not done a memtest recently.

If the secondary superblock isn't found, should I just format the hard drive and copy across the missing stuff from the backup?

Do you still have the original disk?

I would recommend memtest before doing anything else

1 minute ago, trurl said:

Do you still have the original disk?

I would recommend memtest before doing anything else

Yeah, I still have the original disk, and I'll do a memtest after the check is completed, to avoid future complications.

16 minutes ago, trurl said:

Do you still have the original disk?

I would recommend memtest before doing anything else

Quick question, what would happen if I were to skip the process of doing the check disk and all that, and went with formatting the disk?

Just curious as the data is all backed up and stuff.

You would format the emulated disk, then a rebuild would result in a formatted disk.

Except

40 minutes ago, trurl said:

Your syslog seems to indicate problems getting parity correct. If parity isn't correct, the disk can't be emulated for rebuild.

35 minutes ago, trurl said:

I would recommend memtest before doing anything else

Then, after we are sure memory is good, get parity fixed.

Then, think about what to do next.

2 minutes ago, trurl said:

You would format the emulated disk, then a rebuild would result in a formatted disk.

Except

Then, after we are sure memory is good, get parity fixed.

Then, think about what to do next.

Ah, yes. Thank you. Forgotten about the emulated disk bit. Well, I'll let it run overnight and will get some rest. Will reply when there's any updates.

After memory is tested and working perfectly (even 1 error is too many), you could New Config the original disk back into the array and let parity rebuild, then try the replace/rebuild again.

Noted, thank you.

2 minutes ago, trurl said:

New Config the original disk back into the array and let parity rebuild

Assuming there was nothing actually wrong with the original.

8 hours ago, trurl said:

Assuming there was nothing actually wrong with the original.

No superblock found and memtest found no errors, so I'm just gonna start the rebuilding of the parity, and do what you said. Thank you for your time.

If you intend to New Config the original disk back into the array, then no point in building parity before that since parity must be rebuilt after the New Config.

2 minutes ago, trurl said:

If you intend to New Config the original disk back into the array, then no point in building parity before that since parity must be rebuilt after the New Config.

Yeah, I placed the old hard drive back in and the server said that the old drive was smaller than what I tried to replace it with. So I just went with the New Config and started rebuilding the parity from there.