Unable to swap out a failed drive

[len5623]

New user on trial version of Unraid so very possible something obvious!
Version: 6.12.0-rc6
I have the following setup:-
Parity 2TB, Data Array of Disk1 2TB, Disk2 1TB, Disk3 1TB, Cache 500GB + 500GB Raid0.

These disks were what I had around and will be replaced with a new group of drives once I have familiarised myself with the system.

Disk1 is showing increasing read errors and so I want to swap this disk out. My replacement disk is also a 2TB unit although not the same model.

I have followed the procedure set out https://docs.unraid.net/unraid-os/manual/storage-management#data-disks

To replace a failed disk or disks:

1.    Stop the array.
2.    Power down the unit.
3.    Replace the failed disk(s) with a new one(s).
4.    Power up the unit.
5.    Assign the replacement disk(s) using the Unraid webGui.
6.    Click the checkbox that says Yes I want to do this

 

At step 5. I get a "wrong" under Disk1 and a red cross.
Down at the Array Operation area I get "Stopped. Invalid configuration". The Start button is greyed out and "Too many wrong and/or missing disks.

I never see step 6. I have tried this several times always with the same result.

So, what am I missing?

Thanks

Len

 

tower-diagnostics-20230531-0926.zip

[JorgeB]

Disk4 is disabled, since there's single parity it's not possible to replace disk1 before rebuilding disk4.

[len5623]

Disk4 is unassigned. The minimum slot count is 6 so I assumed that that is why Disk4 shows up? There are only 4 disks showing on the dashboard.

[itimpi]

3 minutes ago, len5623 said:

Disk4 is unassigned. The minimum slot count is 6 so I assumed that that is why Disk4 shows up? There are only 4 disks showing on the dashboard.

It looks like disk4 was assigned at some point in the past and never removed cleanly so Unraid has been emulating it.

[len5623]

At the moment I only have 4 sata ports so not sure how that has happened? Any way around this? 

I did a new config after this cropped up initially and the symptoms didn't change.

Edited May 31, 2023 by len5623
added comment

[JorgeB]

You'd need to do a new config, resync parity, then replace disk1.

[len5623]

Disk2 and Disk3 are empty. I could replace Disk1 with original and then could shrink the array and then use one of those removed disks assigned to disk4 to sort out the issue? 

[JorgeB]

Not sure I follow, if you shrink the array you don't need to replace disk4, what I mentioned before would shrink the array to 3 disks + parity.

[len5623]

Went through the shrink array procedure and did the new config part (retaining drive assignments) and Disk4 went away so looks to be OK now.

[len5623]

Successfully swapped the bad drive out and rebulit array.

Many thanks for the help

Len