How can I resize ZRAID-1 after installation?

[magicfab]

I am testing a new PVE install and would like to use ZRAID-1 when installing, however this uses all available space (1TBx3 disks). I'd like to use less as PVE itself normally uses very little (I already have plenty shared network storage) and using less total space would make it faster to rebuild the storage array when/if disks fail.

How can I do this? Perhaps this would be a useful feature at install time (specifiying total space).

 

[LnxBil]

You already have faster rebuild speed with ZFS, that's one of the cool features. Only used blocks get resilvered (that's the term in ZFS for rebuilding). If everything works now and you do not need the disks, just leave it as it is.