====== ZFS - Pools - Expand a ZFS Pool ======

zpool add - This adds a vdev to a pool. This generally results in more storage space.

zpool attach - This attaches a device to a vdev in the pool. This generally results in more redundancy.

----

===== Adding vdevs =====

Adding a RAID Z1 vdev to a pool

<code bash>
zpool add testpool raidz1 ada4 ada5 ada6
</code>

Adding a mirrored vdev to a pool:

<code bash>
zpool add testpool mirror ada4 ada5 ada6
zpool add otherpool ada4
</code>

<WRAP info>
**NOTE:**  This will increase capacity.
</WRAP>

----

===== Attaching disks =====

A Disk can be attached.

<code bash>
zpool attach testpool ada1 ada4   
</code>

<WRAP info>
**NOTE:**  This will add ada4 to whichever vdev has ada1.

  * This results in no capacity increase.

</WRAP>

----

===== Detaching Disks =====

A disk can also be detached:

<code bash>
zpool detach testpool ada4
</code>