Removing smaller drives from an existing pool

[jrtaylor92]

I have a zfs pool consisting of 2x2tb and 2x8tb drives. i added the 2x8tb drives after i ran out of space on the 2x2tb drives.
Is it possible to move all the data onto the 8tb drives so i can remove the old 2tb drives? My NAS only has space for 4 drives.

 

[sretalla]

Since you're running mirrors, yes you can.

You can remove a top-level VDEV (one of your mirrors) from a pool on recent versions of ZFS that doesn't have any RAIDZ VDEVs in it (which is the case for you).

The remove operation will start a process to evacuate all data from the mirror to be removed to the remaining pool VDEV(s) and when done, the removed mirror will no longer be part of the pool.

This page in the docs mentions how to get to the screen/widget where you can see the "Remove" button on a VDEV.

Devices

Provides information on settings and functions found on the Devices screens and widget.

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