[SOLVED] How to remove vdev from zpool?

Software & Operating Systems BSD
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I accidentally created a zpool of mirrors with 1 extra mirror making it 11 instead of 10.

I just finished setting up Samba, Permissions, about 40 datasets, and already copied a few terabytes of data when I noticed.

Is there a way to remove one mirror vdev?

I thought something like this was being worked on, and I saw it’s possible for Special (metadata) devices, so I’m wondering if it’s possible in the latest TrueNAS 13.

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Edit, TrueNAS does stuff on the GUI, not the CLI.

I would destroy and start from scratch…

Never tried it, instructions look like it should work.

Run the command with the -n flag, and it should show the new layout with a mirror removed.

If you run it for real, allow it to fully re-allocate before physically removing disks.

You could copy the base dataset elsewhere to a non-mounted pool, as a backup, as you don’t have any actual data saved? If target is not mounted, the children should maintain values, like mountponts?

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When using the CLI, it will error with invalid commands, but iften let you force bad changes.

TrueNAS does all sorts of silly stuff to help users

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VDEV device removal exists in the Solaris version of ZFS. Not sure if it has made it to TrueNAS or not.

https://blogs.oracle.com/solaris/post/oracle-solaris-zfs-device-removal

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Looks like a simple zpool remove tank mirror-X worked fine! Wow, I worried about this for nothing :smiley:.

root@nas[~]# zpool remove AllStore mirror-10
root@nas[~]# zpool status AllStore
  pool: AllStore
 state: ONLINE
remove: Evacuation of mirror in progress since Tue Dec 15 21:40:17 2022
        54.9G copied out of 426G at 233M/s, 12.89% done, 0h27m to go
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