Note: The minimum DS4700 Express configuration is two partitions. The maximum
is 128 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 DS4700 Express host fibre channel
configurations.
DS4700 Express host configurations: This section provides the following
examples of DS4700 Express host fibre channel configurations:
v Redundant host and drive fibre channel loop configurations, as shown in
Figure 87
v Single SAN fabric configuration, as shown in Figure 88 on page 109
v Dual SAN fabric configuration, as shown in Figure 89 on page 109
v Two storage subsystems in a dual SAN fabric configuration, as shown in
Figure 90 on page 110
v Two clusters, as shown in Figure 91 on page 110
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 DS4700 Express. The illustrations are for illustration
purposes only.
In Figure 88 on page 109, the fibre channel switches are connected together via the
inter-switch link (ISL) to form a single SAN fabric.
Host system
with two host
adapters
DS4700
Host system
with two host
adapters
Host system
with two host
adapters
ds470027
DS4700
Figure 87. Examples of redundant host direct attached fibre channel configurations
108 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide
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