TrueNAS SCALE Documentation Archive
This content follows the TrueNAS SCALE 22.12 (Bluefin) releases. Archival documentation is provided for reference only and not actively maintained.
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Pool Manager Screen

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Last Modified 2023-08-31 14:46 EDT

The Storage Dashboard displays information about the pools configured on your TrueNAS system. To create a pool, click the Create Pool button at the top right of the screen. The Pool Manager screen displays:

StorageCreatePoolManagerSCALE

Pool Manager Screen

Name	Description
Name	Enter a name for the pool of up to 50 characters in length that follows ZFS naming conventions. Pool names should be lower-case alpha characters to avoid potential problems with sharing protocols. Names can include numbers, and special characters such as underscore (_), hyphen (-), colon (:), or a period (.).
Encryption	Select to enable ZFS encryption for this pool, the root (parent) dataset and if desired, child datasets and zvols in this pool. See Storage Encryption for more information on using SCALE storage encryption.
Reset Layout	Click to reset the proposed layout displayed. Click before you save to remove any VDEV types selected and move disks assigned to any VDEV back to the Available Disks list.
Suggest Layout	Click to allow TrueNAS to review all available disks and populate the primary data VDEVs with identically sized drives. These drives are balanced for storage capacity and data redundancy. To clear the suggestion, click Reset Layout
Add Vdev	Click to display the dropdown list of VDEV options. VDEV types are Data, Cache, Log, Hot Spare, Metadata or Dedup. Click to add VDEV types to an existing or new pool VDEV setup.
Available Disks	List of available disks on the TrueNAS. Click the chevron_right expand icon to see the disk serial number and model number. Select the checkbox to the left of the disk and then select the blue to the right of the VDEV type (if more than one VDEV type exists or is added with the ADD VDEV button) to move the disks to that VDEV. To move it back to the Available Disks list, select the disk checkbox(es) and the blue .
Data VDevs	List of disks assigned to the VDEV(s). You must include a Data VDEV in any pool you create and before you add any other type of VDEV to the pool. To move disks back to the Available Disks list, select the disk checkbox(es) and the blue symbol.
VDev type	Displays under the Data VDevs heading. For an existing pool, the default VDEV type is the VDEV type for that existing pool. For initial pool creation, the default type is Stripe. After adding disks to the Data VDevs a expand symbol displays with available options to change the default type of VDEV (for example, if two disks are moved to a Data VDEV, the Mirror option displays along with Stripe).
Estimated raw capacity:	Displays the raw storage capacity of the disks for the Data VDEV type.
Estimated total raw capacity:	Displays the estimated total raw capacity of the disks in the VDEV.

Use CANCEL to exit without saving and display the Pools screen.

Use CREATE to add the pool VDEV.

If your system disks do not have unique serial numbers, the Pool Manager screen displays a warning message and the Show disks with non-unique serial numbers option.

PoolManagerWithDiskWarningSCALE1

Select Show disks with non-unique serial numbers to display the system disks.

The 0 selected/ # total below the Available Disks displays a count of the number of disks selected / to the total number of disks available on your system. This counter keeps track of the total number of available disks in the system when disks span across several screen pages.

VDEV Layout Options

Settings	Description
Data	Data is the standard VDEV for primary storage operations. Each storage pool requires at least one data VDEV. Data VDEV configuration typically affects how users can configure other types of VDEVs.
Cache	A cache VDEV is a ZFS L2ARC read-cache used with fast devices to accelerate read operations. Users can add or remove cache VDEVs after creating the pool.
Log	A log VDEV is a ZFS LOG device that improves synchronous write speeds. Users can add or remove log VDEVs after creating the pool.
Hot Spare	A Hot Spare VDEV is a drive or drives reserved for inserting into Data VDEVs when an active drive fails. The system uses hot spares as temporary replacements for failed drives to prevent larger pool and data loss scenarios. When a user replaces a failed drive with a new one, the hot spare reverts to an inactive state and becomes available again as a hot spare. If a user detaches the failed drive from the pool without adding a new one, the system promotes the temporary hot spare to a full Data VDEV member.
Metadata	A Metadata VDEV is a special allocation class used to create fusion pools for increased metadata and small block I/O performance.
Dedup	A Dedup VDEV stores ZFS de-duplication. Requires allocating X GiB for every X TiB of general storage. Example: 1 GiB of Dedup VDEV capacity for every 1 TiB of Data VDEV availability.

Data VDEV Types

Settings	Description
Stripe	Each disk stores data. A stripe requires at least one disk and has no data redundancy.
Mirror	Data is identical in each disk. A mirror requires at least two disks, provides the most redundancy, and has the least capacity.
RAIDZ1	Uses one disk for parity while all other disks store data. RAIDZ1 requires at least three disks.
RAIDZ2	Uses two disks for parity while all other disks store data. RAIDZ2 requires at least four disks.
RAIDZ3	Uses three disks for parity while all other disks store data. RAIDZ3 requires at least five disks.

Pool Manager Screen

Pool Manager Screen

VDEV Layout Options

Data VDEV Types

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