A disk that is set up for a non-root ZFS file system is relabeled automatically when the pool is created or when the disk is added to the pool. If whole disks are used either to create a pool or to add to a ZFS storage pool, an EFI label is applied.
Generally, most modern bus types support hot-plugging. This feature enables a system to immediately recognize a disk that you insert in to an empty slot. For more information about hot-plugging devices, see Chapter 2, Dynamically Configuring Devices.