HP Array Controller HSG V8.7 Software - Manual (Page 65)

Configuring an HSG80 Array Controller 2–11
Using Multiple-Bus Failover
Multiple-bus (or host-assisted) failover is a dual-redundant controller
configuration in which each array controller has its own connection to
the host. Thus, if one of the host connections to an array controller
fails, the host can cause units that became inaccessible to failover to the
remaining viable connection. Because both array controllers service the
same storage units, either array controller can continue to service all of
the units if the other array controller fails.
Keep the following points in mind when considering using multiple-bus
failover:
n The host distributes the I/O load between the array controllers.
n The host must have two Fibre Channel adapters as well as
operating-system software to support the multiple-bus failover,
dual-redundant controller configuration.
n Mount both array controllers in the same BA370 rack-mountable
enclosure and follow the steps in “Configuring an HSG80 Array
Controller,” page 2–3.
n Partitioning is not supported.