IBM DS4700 manual Redundant host and drive loops

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:

vRedundant host and drive fibre channel loop configurations, as shown in Figure 87

vSingle SAN fabric configuration, as shown in Figure 88 on page 109

vDual SAN fabric configuration, as shown in Figure 89 on page 109

vTwo storage subsystems in a dual SAN fabric configuration, as shown in Figure 90 on page 110

vTwo 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.

Host system	Host system	Host system
with two host
	with two host	with two host
adapters
	adapters	adapters

DS4700

DS4700

ds470027

Figure 87. Examples of redundant host direct attached fibre channel configurations

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.

108IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide