It appears that ZFS interacts with
I have had success duplicating drive contents one slice at a time using a command similar to
cat /dev/rdsk/c1t3d0s0 > /dev/rdsk/c1t4d0s0.
The /dev/rdsk devices are character devices. These are used for low level manipulation of the corresponding slice's data a character at a time. The /dev/dsk devices are block devices. These are used for accessing the slice's data in blocks in a structured manner through a filesystem.
ZFS works on storage pools. Storage pools are built using virtual devices (vdevs). Vdevs can be built from disks,partitions or block devices.