Long story short, I had to temporarily physically remove an M. 2 drive from my two-drive ZFS mirror pool. I started the array without the drive and none of the docker services started even though the other drive in the mirror was online and showing healthy but in a (expected) degraded state. 

 

Since the system wasn't operational with only one drive in the ZFS mirror, I powered down the system, popped the ORIGINAL drive back in the system, and powered it on. Before manually starting the array, I noticed the ZFS mirror pool was now only showing one disk/one drive slot. I added a slot to the pool and put the ORIGINAL m.2 drive back in the new slot. Unraid warned me the drive would be wiped when starting the array and I thought this was ok since it would need to resync the data between both drives. 

 

The pool is now showing healthy with two drives, both in the unraid main tab and ZFS master. The drive that was never removed shows green and the one that was taken out and put back in shows a blue 'new device' icon. I am not sure if this means the ZFS mirror is functional and both drives are in sync. In my silliness with this entire task, I am wondering if maybe their 'slots' got reversed, and that somehow messed up the zfs pool? 

 

Running the latest BETA 7.0.0-beta.3

 

Could someone please let me know if there's a command I have to run or something to get the mirror back to fully operational, or if it is operational at this point even with the blue new device indicator?

 

Thank you! 

 

 

 

 

Edited October 16, 20241 yr by FCruz2489

10 hours ago, FCruz2489 said:

Unraid warned me the drive would be wiped when starting the array and I thought this was ok since it would need to resync the data between both drives. 

It doesn't need to wipe it, it will just bring the offlined device up to date, you can see it here:

 

 

To show the pool correctly now, stop the array, click on the pool, select "remove pool", then go back to main, add the pool again, assign both devices and it should re-import and show both green.

That did the trick! Thank you very much for the help!