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. Hosts C and D still have
access to the media changers and to 50% of the drives on VTL2 and 50% of the drives on VTL1
B6200 failover between nodes is enabled.
Scenario 2, single fabric with dual switches, not advised
The FC configuration is the same in this scenario, but the VTLs are presented to a single port. This
configuration is not advised because it compromises the B6200 autonomic failover facility.
FC configuration
• Multiple switches within a single fabric
• All hosts can see the robots over two separate switches
• Zoning by WWPN
• Each zone to include a host and the required targets on the HP B6200 Backup system
• Equivalent ports on each node see different switches
B6200 VTL configuration
• B6200 failover nodes will not failover if we lose a FC port on the node
• Up to 120 WWNs can be presented to the individual port
• Loss of a port or switch means that all access is lost to the VTLs that are dedicated to that port
• Library configuration is all drives presented entirely to a single port, either Port 1 or Port 2
Figure 27 Separate VTLs presented to separate ports and into different switches in different Fabrics,
not recommended
Scenario 2, single fabric with dual switches, not advised 53