Create ZFS pool with 3 way mirror fails

Cannot reproduce, but "invalid profile: 'mirror' 3 0" is a problem, should be 'mirror' 3 1.

 

Can you describe the steps you took to create the pool?

 

This is what I did:

 

assign 3 devices to a pool

click on the first device and change fs to zfs, mirror, 1 group of 3 devices

start array

format pool

 

 

 

 

Maybe order matters?

 

Already had 3 device pool that originally had the 3 SSD's in a BTRFS 3 way, but slots were empty.

Clicked on first device, changed format to ZFS, 1 group 3 members, applied changes

Assigned 3 devices to the 3 empty slots, confirmed ZFS still was selected

Started array, formatted pool.

 

I guess to recreate try first setting up a 3 way BTRFS, format it, stop the array, unassign pool slots, start/stop array to commit change, change first pool slot to ZFS, assign disks.

8 minutes ago, JonathanM said:

Maybe order matters?

Yep, that's it, if you first select the pool type before assigning the devices it will fail, it's something I never tried before, the idea is that you select the fs/profile after assigning the devices, because you can't even change from mirror to a different one for example without devices assigned, but the GUI does allow that, so it should be corrected.

So, what would be the best way to reset?

 

14 minutes ago, JorgeB said:

it's something I never tried before

🤣 Well, at least I uncovered it early. Too bad I didn't try it during the RC cycle.

Also, do you want to leave this report open until the GUI is fixed?

Since the pool is new and there's no data you can:

 

stop array

click on first pool device 

click erase and proceed to erase the pool

set fs to zfs and profile to mirror

start array

format pool

 

And yes, leave it open for now, I think it's something LT will want to fix.

That worked, thanks!

I added a few steps, but the end result was the same. I first selected auto as the file system type, and as expected, it imported the existing BTRFS pool. Then I did the erase and reset.

 

BTW, the three way default after I did the erase and selected ZFS was RAID0, don't know if that's intended.

3 minutes ago, JonathanM said:

don't know if that's intended.

It's the default for now, but the plan is to change that in the future.

Is it possible to have 2 or more mirrored cache pools with zfs? I have previously successfully created an SSD mirrored cache pool with zfs but when following the same process to create another cache pool with zfs mirror with a pair of HDDs I get the error as indicated earlier in this thread and cannot resolve it by following the instruction. 
 

thanks 

Edited February 11 by BigFam
Clarification

44 minutes ago, BigFam said:

Is it possible to have 2 or more mirrored cache pools with zfs?

Yes, if it's failing post the diags after doing it.