Unraid ZFS pool expansion

[Smasher]

I have a ZFS Raidz pool with 3 drives. When I setup the pool I set it up with 6 slots. I am now attempting to add another 20TB drive to expand storage and I am encountering an error. Is there no way to expand a ZFS pool in unraid? I am running 6.12.6. The current pool is over 70% full and way larger than my main array so I have no way to back this up and recreate a new pool.

 

Help Please 🙏

[Smasher]

I did some more research and it looks like this functionality is very new. Maybe this is a case where unraid needs to implement a new version of ZFS? https://github.com/openzfs/zfs/pull/15022

[JorgeB]

That functionally should work, please post the diagnostics.

[Smasher]

Here are the diagnostics!

blackbird-diagnostics-20240207-1031.zip

[JorgeB]

I'm sorry, I didn't read the 1st post correctly, you cannot expand a zfs raidz pool by adding a single device, this is a zfs limitation, not Unraid, Unraid allows you to expand a raidz pool by adding a new vdev with the same width, in this case you would need to add 3 new disks.

 

 

[Smasher]

25 minutes ago, JorgeB said:

I'm sorry, I didn't read the 1st post correctly, you can only expand a zfs raidz pool by adding a new vdev of the same width, this is a zfs limitation, not Unraid, in this case you need to add 3 new disks.

 Thank you, that seems to be correct but hopefully will be changing. 🤞 This is released soon. https://github.com/openzfs/zfs/pull/15022

[JorgeB]

It should change in about a year, with openzfs 2.3.