The Sun ZFS Storage 7120 can support up to two Sun Disk shelves. The figures below show the complete set of supported configurations, as well as steps to migrate from one state to another.
NOTE: Cabling diagrams are not representative of proper slot location for HBAs.
fig.1 Sun ZFS Storage 7120 system with one Sun Disk shelf
fig.2 Sun ZFS Storage 7120 system with two Sun Disk shelves