TrueNAS Scale Storage

Last Edit: 2023.12.10


Manage, create, and utilize storage in TrueNAS Scale.



Navigate to the Storage tab in TrueNAS to access the Storage Dashboard. Displayed will be the number of unassigned disks that are available. Create a new pool or import an existing pool with the TrueNAS management tools.

Screenshot of Storage Dashboard.

Create Pool

A new dataset can be created from unassigned disks. This example will create a Raid-z2 array across 8 disks.

In the Storage Dashboard, select Create Pool to open the Pool Manager.

Configure the new pool in the Pool Manager.

Namepool01Name the pool.
EncryptiontrueRead the warning from TrueNAS and refer to the TrueNAS Scale encryption documentation before enabling encryption. This encryption offers protection in transport and disposal of drives. If you lose the generated keys you will lose access to your data.
Encryption StandardAES-256-GCMEncryption algorithm to use if encryption is enabled.
Add VDev TypeDataData is the default type, and the one to use for storage VDev’s.

When configured, select Create to create the pool to your specifications.

Screenshot of Pool Manager creating an 8 disk Raid-z2 array.

Import Pool

Import existing ZFS pools easily with the built in Import Pool tool.

In the Storage Dashboard, select Import Pool.

Screenshot of Import Pool tool.

Hot Spare

Dedicate a drive to be a hot spare in your system. When a drive in the configured VDev fails, this drive will automatically be used to start rebuilding.

In the Storage Dashboard, find the pool to add the hot spare, and under Topology select Manage Devices.

Select Add VDev from the Devices page, found in the upper right.

In the Pool Manager, select Add VDev and navigate to the Spare section.

Select the disk to use as the hot spare from the available devices.

Once assigned, select Save And Go To Review to apply the configuration. Verify the spare assignment and Update Pool.

Pool Status

When the creation or import process has completed, the pool will be listed in the Storage Dashboard.

Screenshot of created Pool, pool01.


With a created pool, datasets can now be created for data storage.

Navigate to the Datasets tab in the TrueNAS dashboard, select the created pool pool01. The pool itself is the top level dataset.

Screenshot of pool01 dataset.

Create Datasets

Select Add Dataset on the pool details page.

Configure the new dataset using the wizard.

Parent pathpool01Will be the name of the parent dataset.
NametestName of the dataset to create.
CommentsOptional comments for your memory.
SyncInherit (standard)Determines when to wait for data writes to complete.
Compression levelInherit (lz4)Set compression level, LZ4 recommended.
Enable AtimeInherit (off)Update file access time when read.
Encryption OptionsInheritInherit unless the dataset being created needs to have a different key.
ZFS DeduplicationInherit (off)Deduplicate data when stored. Do not use if on a resource-light system.
Case SensitivitySensitiveChoose filename case sensitivity.
Share TypeGenericChange to SMB if required for your application.

Select Save to create the new dataset.

TrueNAS Datasets dashboard with pool01 and test datasets.

Manage Datasets

With the datasets created, configuration and management tools become available on the dataset Details page. View and modify dataset details by navigating to it in the Datasets tab. Available tools include the following and are self-explanatory. Refer to the documentation and your own environment for configuration.

  • ZFS Encryption: Encryption properties.
  • Data Protection - Snapshots, replication, cloud sync, rsync.
  • Dataset Space Management - Quotas, space reservations.
  • Permissions - File permissions, access control lists.


After completing pool setup, verify the configured storage locations for TrueNAS services to use. If you have an SSD pool for applications and an HDD pool for data storage, use the SSD pool for the following configurations.

System Settings - Advanced

In advaned system settings there is a Storage section, select the Configure button, and read the prompted warning.

Select Poolpool00Pool that the TrueNAS system should use. This pool will be indicated by the TrueNAS Scale logo in the roles column of the datasets dashboard.
Swap Size2Swap size for disks added, does not impact existing disks.

Select Save to apply configuration.

Applications Settings

On the Applications page of the TrueNAS dashboard (Apps on the menu), select the Settings button in the upper right and select Choose Pool. Choose the pool the system should store Kubernetes configuration and containers.

Poolpool00Pool to store applications in. Will create an ix-applications dataset in the selected pool.

Select Choose to apply configuration.