HP StoreOnce Backup System Concepts and Configuration Guidelines (BB877-90913, November 2013)

The illustration above shows the flexibility of the configuration
VTL1 is connected to FC Port 1 exclusively
VTL3 is connected to FC Port 2 exclusively
VTL2 is spread across FC Port 1 and FC Port 2. The medium changer is connected to both
ports whereas the drives by default are connected 50% to each port (2 each in this case).
This mode is useful in high availability SANs
General Fibre Channel configuration guidelines 43