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====== TrueNAS - Pool - Add another vdev ======

It is generally recommended to add the same number of hard drives that the pool currently has.

  * Meaning that if you have four hard drives in your pool using RAIDz1, you can add four additional drives, create a Vdev and you will have two Vdevs that are both utilizing RAIDz1.
  * TrueNAS will also automatically balance the data between both Vdevs.

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===== Add a vdev =====

Select **Storage**.

  * Navigate to the pool.
  * Select the gear icon
  * Select **Add Vdevs**.

{{:truenas:pool:truenas_-_pool_-_pool_actions.png?200|}}

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===== Add the hard drives to the vdev =====

  * Add the hard drives to the second Vdev.
  * Select **Add VDEVS**. 
    * Depending on the RAID type being used, it will automatically be selected.

{{:truenas:pool:truenas_-_pool_-_add_vdev.png?600|}}

This will prompt for confirmation:

  * Select **Confirm**.
  * Select **Add Vdev**.

{{:truenas:pool:truenas_-_pool_-_add_vdev_-_warning.png?600|}}

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===== Check that the new vdev is okay =====

  * View the Pool Status.

{{:truenas:pool:truenas_-_pool_-_status.png?600|}}

 
<WRAP info>
**NOTE:**  This should show both Vdevs!
</WRAP>

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