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The PC-BSD® Disk Manager can be used to manage ZFS pools and datasets as well as the disks attached to the system. To access this utility, use Control Panel → Disk Manager or type pc-su pc-zmanager from within an xterm. You will need to input your password in order to access this utility.
As seen in the example in Figure 8.13a, the utility will open in the “ZFS Filesystems” tab and will display the system's ZFS datasets, the amount of space available to each dataset, and the amount of space each dataset is using.
Figure 8.13a: Viewing the System's ZFS Datasets