Before you can create any jails, you must first configure which volume or dataset will be used to hold the jails. To do so, click Jails ‣ Configuration to access the screen shown in Figure 13.1a. It is recommended to create a dataset to use for the “Jail Root”. As jails are created, they will automatically be installed into their own dataset under the specified path. For example, if you configure a “Jail Root” of /mnt/volume1/dataset1 and create a jail named jail1, it will be installed into its own dataset named /mnt/volume1/dataset1/jail1.