User Guide

Chapter 4 Configuration Examples 31
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.
FIGURE 4-4 Single Host With Four Controller Units Configured as Two Partner Groups
Application host
Management host
Ethernet
Ethernet
port
Interconnect
cables
HBA
LAN
FC-AL
FC-AL
HBA
HBA
HBA
Master
Alternate
master
controller
unit
controller
unit