Sun Microsystems manual Sun StorEdge T3 and T3+ Array Configuration Guide August

Single Host With Two Hubs and Eight Controller Units Configured as Four Partner Groups

FIGURE 4-7shows one application host connected through FC-AL cables to two hubs and to eight Sun StorEdge T3+ arrays, forming four partner groups. This configuration is the maximum allowed in a 72-inch cabinet. This configuration can be used for footprint and I/O throughput.

Note – This configuration is a recommended enterprise configuration for RAS functionality because the controller is not a single point of failure.

Note – There are no hub port position dependencies when connecting arrays to a hub. An array can be connected to any available port on the hub.

Each array needs to be assigned a unique target address using the port set command. These target addresses can be any number between 1 and 125. At the factory, the array target addresses are set starting with target address 1 for the bottom array and continuing to the top array. Use the port list command to verify that all arrays have a unique target address. Refer to Appendix A of the Sun StorEdge T3 and T3+ Array Administrator’s Guide for further details.

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

Note – For information on setting these parameters, refer to the Sun StorEdge T3 and T3+ Array Administrator’s Guide

Host-based multipathing software is required for this configuration.

36 Sun StorEdge T3 and T3+ Array Configuration Guide • August 2001