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====== TrueNAS - Disks - Add a Disk to an Existing Pool - Create a Second 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**.

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===== Add the hard drives to the second Vdev =====

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

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

  * View the Pool Status.
 
<WRAP info>
**NOTE:**  This should show both Vdevs!
</WRAP>

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