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140 Appendix A. Supplementary Hardware Information

Figure A-1. Single-controller RAID Array Connected to Single-initiator Fibre Chan-

nel Interconnects

The external RAID array must have a separate SCSI channel for each cluster node. In

clusters with more than two nodes, connect each node to the SCSI channel on the RAID

array, using a single-initiator SCSI bus as shown in Figure A-1.

To connect multiple cluster nodes to the same host port on the RAID array, use a Fibre

Channel hub or switch. In this case, each host bus adapter is connected to the hub or

switch, and the hub or switch is connected to a host port on the RAID controller.

A Fibre Channel hub or switch is also required with a dual-controller RAID array with two

host ports on each controller. This conﬁguration is shown in Figure A-2. Additional cluster

nodes may be connected to either Fibre Channel hub or switch shown in the diagram. Some

RAID arrays include a built-in hub so that each host port is already connected to each of

the internal RAID controllers. In this case, an additional external hub or switch may not be

needed.

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Red Hat CLUSTER SUITE 4.7 DM MULTIPATH Guida di Installazione Pagina 156