Go to the Storage Dashboard and click Create Pool.

TrueNAS allows setting data or object quotas for user accounts and groups cached on, or connected to the system. You can use the quota settings on the Add Dataset or Edit Dataset configuration screens in the Advanced Options settings to set up alarms and set aside more space in a dataset. See Adding and Managing Datasets for more information.

To manage the dataset overall capacity, use Edit on the Dataset Space Management widget to open the Capacity Settings screen.

The Snapshots screen lists dataset snapshots on the system. It allows you to add new or manage existing snapshots.

Access to the Snapshots screen is available using the Manage Snapshots link on the Data Protection widget on the Datasets screen and by clicking Snapshots on the Periodic Snapshot Tasks widget on the Data Protection screen.

If the selected dataset does not have snapshots, the screen displays No Snapshots are Available.

Taking snapshots requires the system have all pools, datasets, and zvols already configured.

The Storage Dashboard widgets provide enhanced storage provisioning capabilities and access to pool management options to keep the pool and disks healthy, upgrade pools and VDEVs, open datasets, snapshots, data protection screens, and manage S.M.A.R.T. tests. This article provides instructions on pool management functions available in the TrueNAS UI.

Select Storage on the main navigation panel to open the Storage Dashboard. Locate the ZFS Health widget for the pool, then click the Edit Auto TRIM. The Pool Options for poolname dialog opens.

Now that you are logged in to the web interface, it is time to set up TrueNAS storage. These instructions describe a simple mirrored pool setup, where half the selected disks are used for storage and the other half for data protection. However, there are many configuration possibilities for your storage environment!

You can read more about these options in Creating Storage Pools. You can also use the ZFS Capacity Calculator and ZFS Capacity Graph to compare configuration options.

File Explorer limits the number of snapshots Windows presents to users. If TrueNAS responds with more than the File Explorer limit, File Explorer shows no available snapshots. TrueNAS displays a dialog stating the dataset snapshot count has more snapshots than recommended and states performance or functionality might degrade.

There are two ways to view the list of snapshots:

Datasets, root, non-root parent, and child, or zvols with encryption include the ZFS Encryption widget in the set of dataset widgets displayed on the Datasets screen.

The Datasets tree table includes lock icons and descriptions that indicate the encryption state of datasets.

Icon	State	Description
	Locked	Displays for locked encrypted root, non-root parent and child datasets.
	Unlocked	Displays for unlocked encrypted root, non-root parent and child datasets.
	Locked by ancestor	Displays for locked datasets that inherit encryption properties from the parent.
	Unlocked by ancestor	Displays for unlocked datasets that inherit encryption properties from the parent.

The Encryption option on the Pool Manager screen sets encryption for the pool and root dataset.

ZFS supports deduplication as a feature. Deduplication means that identical data is only stored once, which can significantly reduce storage size. However, deduplication is a compromise and balance between many factors, including cost, speed, and resource needs. Consider and understand the implications of using deduplication before adding it to a pool.

Deduplication is one technique ZFS can use to store files and other data in a pool. If several files contain the same pieces (blocks) of data or any other pool data occurs more than once in the pool, ZFS stores just one copy of it. Instead of storing many copies of a book it stores one copy and an arbitrary number of pointers to that one copy. Only when no file uses the data is the data deleted. ZFS keeps a reference table that links files and pool data to the actual storage blocks containing their data. This is the deduplication table (DDT).

Zettabyte File system (ZFS) is an advanced, modern file system specifically designed to provide features not available in traditional UNIX file systems. Sun originally developed and intended ZFS to be an open-source file system that can be ported to other operating systems. After the Oracle acquisition of Sun, some of the original ZFS engineers founded OpenZFS to provide continued, collaborative development of the open source version.

Here is an overview of the features provided by ZFS.