Here's the sequence of events:

1. Unexpected power failure overnight, during a parity check
2. Started the Unraid machine
3. Brought array into maintenance mode
4. Performed a 'reiserfsck --check' on all 9 disks (not the parity drive of course)
5. All but one succeeded without error. On one disk, errors were detected and it advised re-running with the --rebuild-tree option, so I did that and let it finish. Here is the final output:
 

Flushing..finished
        Objects without names 446
        Empty lost dirs removed 32
        Files linked to /lost+found 446
Pass 4 - finished done 4485, 2242 /sec
        Deleted unreachable items 10157
Flushing..finished
Syncing..finished

6. Brought array down
7. Started a parity check

The parity check is currently running. My question is: will that parity check restore whatever data was lost/damaged on that disk that had file system errors?

Thanks!

Unraid version: 6.8.3

Edited December 8, 20241 yr by BigErn77

1 hour ago, BigErn77 said:

The parity check is currently running. My question is: will that parity check restore whatever data was lost/damaged on that disk that had file system errors?

No.   parity handles disks failing, not file system corruption.

So, if I'd installed a new disk in the disk 1 slot, it would have restored my data to it, but since I didn't, and it's now checking parity, it's now in the process of "confirming" the bad files to my parity drive?

Also, maybe I was presumptuous in assuming that the files are corrupted. Maybe it was just the file tree that needed to be fixed, but the files themselves are OK?

Edited December 9, 20241 yr by BigErn77

If you had installed a new disk, it would have been rebuilt with the same issues, assuming parity is in sync.

 

Files can be OK, typically this is just a filesystem problem.