(Solved) Failed Parity Drive (on 2 parity system)

[elbobo]

I made a terrible mistake, still unsure how I did it.

Background:

Dual Parity system previously 4TB drives, now 6TB, only 6TB in system are the parity drives

Did a swap for Parity 1 - Copy Successful, rebuild successful

Did a swap for Parity 2 - Copy Successful, rebuild currently running

Get alert that Parity 2 has raw read error (in the thousands) - Odd for a new drive... This is where I discover my terrible mistake, I've accidently placed a drive that had 3.5 years of spin time on it from my other Unraid box instead of the new 6TB.

 

At this point I have paused the rebuild of the previous Parity drive (now a disk in the array) because I don't think I should trust the Parity 2.

 

What's the best way to resolve this with the least risk to data? Everything important on the array is offsite backed up... but if I can avoid bringing it back (and losing the unimportant stuff) I would like that. 

 

Should I (and can I even) pull parity 2 and restart the data-rebuild of Disk 4 (the swapped disk) then once that is complete, add a new 6TB drive as parity 2 and have that start it's process?

 

Still unsure how this drive made it from my "destroy/recycle" pile back to the "on hand to swap if necessary" stack... I will be putting some failsafes in place to prevent that going forward. I cannot believe I did this... I am certainly kicking myself...

Edited November 22, 2021 by elbobo
Solved

[trurl]

Do you still have the original disk4?

 

attach diagnostics to your NEXT post in this thread

[elbobo]

Diagnostics attached. 

No, the original disk 4 does not exist anymore.

 

Thank you

tower-diagnostics-20211121-2043.zip

[trurl]

I think if you unassign parity2 you should be able to rebuild disk4 from parity since it is the only invalid disk.

[trurl]

2 minutes ago, trurl said:

I think if you unassign parity2 you should be able to rebuild disk4 from parity since it is the only invalid disk.

If it won't let you do that for some reason, we have ways to make it.

[elbobo]

Thank you for your help! 

 

I have unassigned parity 2 and restarted the array, it is rebuilding Disk4 and I am optimistic that this will be successful. 

 

Once it is done (and I get a new 6TB in) I will readd my Parity2 removing the unassigned drive and marring/tagging/disposing of it so this never happens again.