ZFS: Grow or add more disk space to pool or filesystem

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From the computer of: qmchenry (338 recipes)
Created: Jun 06, 2006

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Run out of disk space on your production server? Cringe at the downtime required to bring filesystems offline, backup, create bigger filesystems, and restore all the while typing with crossed fingers? Dread deciding the disk layout for your new server? Don't panic! ZFS has you covered. In one simple command, you can add space to a ZFS pool without taking it offline.

Given a ZFS pool techrx and an unused disk denoted by c1t0d0, you can add the disk to the pool (a non-mirrored pool -- that's another recipe) with this command:

Before, the output of zfs list showed:

After the zpool command, the same command shows:

It's worth pointing out again that this command works on a live, mounted filesystem. All of the filesystems in the techrx pool benefit from this increase in space (unless they have a quota).