SOLVED Upgrading 2-way Mirror into 3-way Mirror

[kamhoe]

Can I possible to add an extra disk from my current 2-way mirror (jails) into 3-way mirror?

Or I have to transfer the jails to a temporary pool, destroy the 2-way mirror & re-create a new 3-way mirror?

 

[Samuel Tai]

The latter, as vdev expansion isn't available in OpenZFS 2.0, which is what TrueNAS 12.0 runs. Expansion is planned for OpenZFS 2.1, which is planned for release with TrueNAS 13.

 

[Etorix]

It's possible, and simple once you know it's weirdly labelled in the GUI:
Storage > Pools > (gear) > Status > (…) > Extend

 

[Etorix]

The latter, as vdev expansion isn't available in OpenZFS 2.0, which is what TrueNAS 12.0 runs. Expansion is planned for OpenZFS 2.1, which is planned for release with TrueNAS 13.

Expanding mirrors is always possible.
Next year's OpenZFS 2.1 is supposed to bring raidZ expansion; that's not applicable here.

 

[kamhoe]

Thanks all! I don't know if I can hold it until OpenZFS 2.1 next year but I am planning to switch it to 3-way when I receive the new drive by this weekend.