Redundant Host And Drive Loops - IBM DS4200 Installation, User's, And Maintenance Manual

Note: The minimum DS4200 Express configuration is two partitions. The maximum
is 64 partitions. Configuration upgrades are available as upgrade options.
Contact your IBM reseller or marketing representative for more information.

Redundant host and drive loops

This section provides examples of DS4200 Express host fibre channel
configurations.
DS4200 Express host configurations: This section provides the following
examples of DS4200 Express host fibre channel configurations:
v Redundant host and drive fibre channel loop configurations, as shown in
Figure 56
v Single SAN fabric configuration, as shown in Figure 57 on page 76
v Dual SAN fabric configuration, as shown in Figure 58 on page 76
v Two storage subsystems in a dual SAN fabric configuration, as shown in
Figure 59 on page 77
v Two clusters, as shown in Figure 60 on page 77
Notes:
1. These configurations have host and drive path failover protection and are
recommended for high availability.
2. The following illustrations do not accurately represent the controller locations or
port locations in the DS4200 Express. The illustrations are for illustration
purposes only.
Host system
with two host
adapters
DS4200
Figure 56. Examples of redundant host direct attached fibre channel configurations
In Figure 57 on page 76, the fibre channel switches are connected together via the
inter-switch link (ISL) to form a single SAN fabric.
Host system Host system
with two host with two host
adapters adapters
DS4200
Chapter 3. Cabling the storage subsystem
75