Adding Zvols

A ZFS Volume (Zvol) is a dataset that represents a block device. These are needed when configuring an iSCSI Share. To create a zvol in a pool, go to Storage > Pools then click and Add Zvol. Options To quickly create a Zvol with the default options, enter a name for the Zvol, a size, and click SAVE. See Zvols Screen for more information on zvol settings. Setting Zvol Block Sizes To set the zvol block size, click ADVANCED OPTIONS on the ADD ZVOL screen.
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Zvols Screen

Use the Storage > Pools Add Zvol screen to add a zvol to a pool. 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.
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Adding and Managing Zvols

A ZFS Volume (zvol) is a dataset that represents a block device or virtual disk drive. TrueNAS requires a zvol when configuring iSCSI Shares. Adding a virtual machine also creates a zvol to use for storage. Storage space you allocate to a zvol is only used by that volume, it does not get reallocated back to the total storage capacity of the pool or dataset where you create the zvol if it goes unused.
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Zvol

The zvol screens and widgets, accessed from the Datasets screen, allow you to add or edit a zvol and manage the volume storage. Like datasets, zvols are listed on the Datasets screen tree table. The tree table includes storage space used and available for that zvol (or dataset), encryption status (locked, unlocked, or unencrypted), and the role of that zvol or dataset or what service uses it (i.e., the system dataset, a share, virtual machine, or application).
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Snapshots

The Snapshots screen, accessed from the Datasets screen by clicking Manage Snapshots on the Data Protection widget, provides a list of existing snapshots filtered for the snapshot you selected, allows you to add new or manage existing snapshots. The Snapshots screen also opens when you click Snapshots on the Periodic Snapshot Tasks widget found on the Data Protection screen. Snapshots Screen If the selected snapshot does not have snapshots the screen displays No Snapshots are Available.
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Encryption Settings

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. Figure 1: Dataset Tree Table Encryption Icons 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.
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Storage Encryption

TrueNAS SCALE offers ZFS encryption for your sensitive data in pools and datasets or Zvols. Users are responsible for backing up and securing encryption keys and passphrases! Losing the ability to decrypt data is similar to a catastrophic data loss. Data-at-rest encryption is available with: Self Encrypting Drives (SEDs) using OPAL or FIPS 140.2 (Both AES 256) Encryption of specific datasets (AES-256-GCM) The local TrueNAS system manages keys for data-at-rest. Users are responsible for storing and securing their keys.
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