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A single initiator fibre channel has only one cluster connected to one fibre channel host port. If your fibre channel disk array subsystem has dual controllers, you can connect each cluster to each of the fibre channel host port. The dual controller of the disk array must allow the two clusters to view all the logical devices in the disk array and has the same set of logical unit numbers (LUNS).
A single port fibre channel disk array can be used in a cluster system with an additional fibre channel switch or hub. However, the fibre channel switch or hub can be a single point of failure of the system. Administrators must be aware of the risk of setting up such systems.
If you are using a SAN subsystem, and your SAN controller supports groups. Make sure you have defined the host ports of the cluster in the same group such that both clusters can boot from and see the same logical units. If you are planning to setup multiple cluster pairs, you should define one group per cluster pairs. Please consult your SAN storage vendor for more details.