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Most fibre channel switches support eight to 16 hosts. If the configuration requires
more hosts than four fibre channel switches can support, you must add cascading
switches, as shown in Figure 82.
Cluster servers
If the fibre channel network environment into which you are installing the storage
subsystem is configured for cluster servers, you must install two host bus adapters
per cluster node. For complete information about installing host bus adapters, refer
to the IBM TotalStorage DS4000 FC2-133 Dual Port Host Bus Adapter Installation
and User’s Guide.
Figure 83 on page 110 shows fibre channel connections using a dual-path
configuration for fully redundant environments.
Note: The interlink is used as the clustering heartbeat path.
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Figure 82. Adding hosts by using cascading switches
Chapter 3. Cabling the storage subsystem 109