Get a Quote     (408) 943-4100               TrueNAS Discord      VendOp_Icon_15x15px   Commercial Support Toggle between Light and Dark mode
TrueNAS.com Software Systems Company Community Security iX Portal Download

  1. Documentation Hub
  2. /
  3. TrueNAS CORE and Enterprise
  4. /
  5. UI Reference Guide
  6. /
  7. Storage
  8. /
  9. Pools
  10. /
  11. Zvols Screen
Edit this page

Zvols Screen

  3 minute read.

Last Modified 2022-09-27 14:01 -0400

Use the Storage > Pools Add Zvol screen to add a zvol to a pool.

AddZvolAdvancedOptionScreen

Basic Options

Setting Description
Zvol name Enter a short name for the zvol. Using a zvol name longer than 63-characters can prevent accessing zvols as devices. For example, a zvol with a 70-character filename or path cannot be used as an iSCSI extent. This setting is required.
Comments Enter any notes about this zvol.
Size for this zvol Specify size and value. Units like t, TiB, and G can be used. The size of the zvol can be increased later, but cannot be reduced. If the size is more than 80% of the available capacity, the creation fails with an out of space error unless Force size is also selected.
Force size Select to force the system to create a zvol that brings a pool to over 80% capacity (not recommended). By default, the system does not create a zvol if that operation brings the pool to over 80% capacity.
Sync Select an option from the dropdown list that sets the data write synchronization. Inherit sets zvol to get sync settings from the parent dataset, Standard uses the sync settings requested by the client software, Always that waits for data writes to complete,or Disabled that never waits for writes to complete.
Compression level Select a compression option from the dropdown list. Select Off to not compress data to save space. Refer to Compression for a description of the available algorithms.
ZFS Deduplication Do not change this setting unless instructed to do so by your iXsystems support engineer.
Sparse Select to provide thin provisioning. Use with caution as writes fail when the pool is low on space.
Read-only Select an option from the dropdown list to set whether the zvol can be modified. Options are Inherit to get and use the parent pool or root dataset settings, On to prevent modifying the zvol, or Off to allow the zvol to be modified.
Inherit (Encryption Options) Select to enable the zvol to use the encryption properties of the root dataset.

Selecting ADVANCED OPTIONS adds one additional setting.

Setting Description
Block size select the default Inherit or select from the other dropdown list options 4KiB, 8KiB, 16KiB, 32KiB, 64KiB or 128KiB. See Creating a Zvol for more information on these options and block sizes.

SUBMIT activates after all required fields are populated. Use to save settings.

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

Related Content

Related Storage Articles