What is a ZVOL in FreeNAS?

What is a ZVOL in FreeNAS?

A zvol is a feature of ZFS that creates a raw block device over ZFS. This allows you to use a zvol as an iSCSI device extent. To create a zvol, select an existing ZFS volume or dataset from the tree then click “Create zvol” to open the screen shown in Figure 8.1e.

What is TrueNAS ZVOL?

A ZFS Volume (zvol) is a dataset that represents a block device. TrueNAS requires a zvol when configuring iSCSI Shares. To create a zvol in a pool, go to Storage and click on a pool or dataset, then select Add Zvol.

What is the difference between a ZVOL and dataset?

A zvol is block storage, while datasets are file-based. The name of the system is FreeNAS. It is capitalized that way because it stands for Free Network Attached Storage.

What is a sparse ZVOL?

What is a hot spare and how does it work? The ZFS hot spares feature enables you to identify disks that can be used to replace a failed or faulted device in one or more storage pools. Note: The device or devices that you designate as a spares must be equal to or larger than the size of the largest disk in the pool.

What version of FreeBSD is FreeNAS?

FreeNAS is a FreeBSD based operating system for Network Attached Storage. The current version 11.1 is based on FreeBSD 11.1-STABLE. It can be used on 64bit compatible hardware.

Why is TrueNAS free?

TrueNAS CORE will always be completely Open Source and free. TrueNAS Enterprise and iXsystems support are available for more critical storage applications. The upgrade from FreeNAS to TrueNAS CORE is as simple as clicking a button in the UI. The upgrade is free and the software is still Open Source.

What is dataset and ZVOL?

Dataset – This is the file system portion of ZFS, which sits on top of the zpool. zvol– These are a bit different that a dataset. If you were to think of a dataset as a NAS-type device (i.e. file-based), then the zvol is more of a SAN-type device (block base).

What is a TrueNAS dataset?

A TrueNAS dataset is a file system that is created within a data storage pool. Datasets can contain files, directories (child datasets), and have individual permissions or flags. Datasets can also be encrypted, either using the encryption created with the pool or with a separate encryption configuration.