Solaris ZFS partitioning notes
From b0rken.org
Even when Solaris claims to be using a "whole disk" for ZFS, it has actually partitioned it behind the scenes.
On sparc systems, the boot drive has an SMI label with a single partition spanning almost the entire disk.
On x86 systems, the boot drive has an MBR label with a single partition spanning almost the whole disk.
Other disks have a EFI label written, again with a single partition spanning the whole disk.
