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

If FC switch1 fails, Host A and Host B lose access to their backup devices, even though B6200
failover is enabled because the physical configuration provides a point of failure. Hosts C and D
still have access to the media changers and to 100% of the drives on VTL3 and VTL4.
Scenario 3, dual fabric with dual switches, recommended
This FC configuration has added complexity because it has two fabrics. The arrows illustrate
accessibility, not data flow.
FC configuration
• Dual fabrics
• Multiple switches within each fabric
• Zoning by WWPN
• Each zone to include a host and the required targets on the HP B6200 Backup system
• Equivalent ports from each node can see the same fabric, but are directed to different switches
B6200 VTL configuration
• Default library configuration is 50% drives presented to Port 1, 50% presented to Port 2. Robot
appears on Port 1 and Port 2
• Up to 120 WWNs can be presented to Port 1 and Port 2
• On B6200 failover all WWNs of failed node are automatically transferred to the corresponding
port on the other node, which still has access to both fabrics. This is transparent to the hosts.
Figure 28 Complex configuration with ports of different VTLs being presented to different fabrics,
recommended configuration
54 Configuring FC to support failover in a StoreOnce B6200 Backup system environment