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Perhaps the most important part about TrueNAS is the ability to efficiently store and share large amounts of data. The way this is accomplished is through setting up ZFS Pools.
To set up a pool in TrueNAS, go to Storage > Pools and click ADD.
Set Create a new pool and click CREATE POOL.
First, enter a name for the pool. If you want to encrypt the data for additional security, set the Encryption option. Be aware that this can also complicate how data is retrieved and has some risks. Refer to the Encryption article for more details.
Now configure the virtual devices (vdevs) that make up the pool. The TrueNAS web interface can simplify this by recommending a vdev layout based on the number of available disks. Click SUGGEST LAYOUT to add all same-sized disks in an ideal configuration for data redundancy and performance.
To manually add disks in a vdev, select the disks to add and click .
TrueNAS helpfully suggests a vdev layout based on the number of disks added to the vdev. For example, if two disks are added, TrueNAS automatically configures the VDEV as a mirror (one redundant disk). To change the vdev layout, open the Data VDevs list and select the desired layout. Note that a stripe is never recommended for storing critical data, as a single disk failure can result in losing all data in that vdev.
A vdev layout can be duplicated by clicking REPEAT. If more disks are available and equal in size, the REPEAT button creates another vdev with an identical configuration. Thus, it creates a mirror of vdevs. Otherwise, another vdev can be added by clicking ADD DATA and adding disks as was done in the first vdev.
WarningIt is not recommended to have multiple data vdevs with different numbers of disks. Adding multiple vdevs with different layouts to a pool is not supported. Create a new pool for the different layout. For example, “pool1” has a data vdev in a mirror layout, so create “pool2” for any raid-z vdevs.
If desired, a cache, log, and spare vdev can be added by clicking ADD CACHE, ADD LOG, and ADD SPARE, respectively. When ready to proceed with the desired vdevs, click CREATE.
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