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

Dual Hosts With Two Switches and Eight

Controller Units

FIGURE 4-13 shows two application hosts connected through FC-AL cables to two

switches and eight Sun StorEdge T3+ arrays. This multi-initiator configuration, can

be used for footprint and I/O throughput.

Note – This configuration is not a recommended for RAS functionality because the

controller is a single point of failure.

The following limitations should be evaluated when proceeding with this

configuration:

■ Avoid the risk caused by any array or data path single point of failure using host-

based mirroring software such as VERITAS Volume Manager or Solaris Logical

Volume Manager.

■ When configuring more than a single array to share a single FC-AL loop, as with

a hub, array target addresses need to be set to unique values.

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 two parameters must be set on the master controller unit, as follows:

■ 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.

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Sun-microsystems Sun StorEdge T3 Bedienungsanleitung Seite 60