Recreating a mirror

[tannebil]

In the process of replacing a failed drive in a mirror on TrueNAS Scale, I made a mistake (detached rather than replaced the failed drive) and the vdev is now a single drive and the GUI will only let me add a new drive as a stripe rather than a mirror. It looks the the right way to make it back into a mirror is the use "zfs attach" in the CLI to just attach the new drive to the vdev. However, since I got into this situation by not being thoughtful enough and the answer appears to be zfs generic and from 2014 rather than specific to TrueNAS Scale, I thought I'd ask for a second opinion. Thanks!

Edit: it's not the boot pool

 

[Patrick M. Hausen]

In the UI navigate to the pool status, click on the menu on the right hand side of the remaning drive and select "extend". That will let you add a new mirror component.

 

[tannebil]

Thanks!

saw that but was afraid it would expand it as as stripe the moment I clicked it which would have compounded my problem.

 

[tannebil]

Reslivering now. Thanks