Single Host With Four Controller Units Configured as Two Partner Groups
FIGURE 4-4 shows one application host connected through FC-AL cables to four arrays configured as two separate partner groups. This configuration can be used for capacity and I/O throughput requirements. Host-based Alternate Pathing software is required for this configuration.
Note – This configuration is a recommended enterprise configuration for RAS functionality because the controller is not a single point of failure.
The following three parameters must be set on the master controller unit, as follows:
■mp_support = rw or mpxio
■cache mode = auto
■cache mirroring = auto
For information on setting these parameters, refer to the Sun StorEdge T3 and T3+ Array Administrator’s Guide.
Alternate master controller unit
Interconnect cables
Master controller unit
FC-AL
Ethernet
Application host
HBA
HBA
HBA
HBA
LAN
Ethernet port
Management host