I  have been having some issues with some of my drives. Almost all sorted out and I bought two new 4TB drives and pre-cleared them. My parity drive is a 3TB. Plus I have a drive that isn't being mounted because of disk errors. 

 

I opted for the parity swap procedure, but I unassigned the incorrect drive, a healthy drive.

 

How do I go about getting this drive back in the array pool? Hopefully without rebuilding the drive with that drive with hundreds of errors?

4 hours ago, NeuralBlade said:

but I unassigned the incorrect drive, a healthy drive.

If you didn't start the array after unassign it you just need to assign it back, if you did please post the diagnostics: Tools -> Diagnostics

I  did start it, and realised it too late.

 

I'm attaching the diagnostics

jfm-nas-diagnostics-20210906-1448.zip

What are the options left for me?

Sorry, due to an old forum bug missed your reply yesterday, you can re-enable disk3, but since the array was mounted without the old disk parity won't be 100% in sync, so there could be issues replacing the failing disk, though there's not much to lose by trying:

 

-Tools -> New Config -> Retain current configuration: All -> Apply
-Check all assignments are correct and assign any missing disk(s) if needed, including the old disk3
-IMPORTANT - Check both "parity is already valid" and "maintenance mode" and start the array (note that the GUI will still show that data on parity disk(s) will be overwritten, this is normal as it doesn't account for the checkbox, but it won't be as long as it's checked)
-Stop array
 

Array is now as it was before, except like mentioned parity won't be 100% valid, but with xfs this is usually recoverable, you might need to do a filesystem check once you replace disk4, especially because the fs on the actual disk is already showing issues, most likely because of the bad sectors.

 

 

Thanks

 

I am now busy with the parity swap