Fibre Channel connections:
The storage subsystem Fibre Channel connection consists of up to two host Fibre
Channel loops. The host Fibre Channel loops provide the fibre path for host
attachment. They can consist of Fibre Channel cables, SFP modules, host bus
adapters, Fibre Channel switches, and controllers.
Fibre Channel host loop configurations:
You must determine how the host systems will connect to the storage subsystem.
You can connect up to four host systems directly to the storage subsystem. The
illustrations in the following sections show common host system configurations.
Redundant host loops:
This section provides examples of host Fibre Channel configurations.
Host Fibre Channel configurations:
This section provides the following examples of host Fibre Channel configurations.
v Single SAN fabric configuration, as shown in Figure 61 on page 69
v Dual SAN fabric configuration, as shown in Figure 62 on page 69
v Two storage subsystems in a dual SAN fabric configuration, as shown in
Figure 63 on page 70
Note: These configurations have host and drive path failover protection and are
recommended for high availability.
In Figure 61 on page 69, the Fibre Channel switches are connected together
through the Inter-Switch Link (ISL) to form a single SAN fabric.
Host system
with dual host
adapters
DS3500
Host system
with dual host
adapters
Figure 60. Dual-controller direct-attached Fibre Channel connections to multiple HBAs in
multiple hosts
68 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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