I've got a drive that spontaneously flipped to being unformatted.

 

Initially I noticed I was missing a bunch of files, but it reported no errors, data that had been then an hour ago suddenly went missing.  I shut the array down and brought it back up and when it did the flipped the one drive to unformatted.

 

I panicked and replaced it with a spare that I had, but the rebuilt apparently just rebuilt the same broken state the disk was in.

 

(Edit)  I ran xfs_repair on /dev/sdx, but that seems to have been incorrect, I needed to do /dev/sdx1 to tell it the partition.  Rerunning that now.

 

Any suggestions on recovering the data on that drive?

 

Edited April 29, 20188 yr by sunflashx

You should be running it against /dev/mdx

running it against /dev/sdx1 will make changes that unRAID will not see and thus not update parity properly.

 

I failed to wait for a response and ran a xfs_repair -vL against /dev/sdx1, which was prompted by the tool to do. 

 

I took the array offline and brought it back on and now my stuff is back, but have I broken my parity?

Yes, run a correcting parity check.