Compaq ProLiant 6500 Compaq Parallel Database Cluster Model PDC/05000 for Orac - Page 83
Planning Quad Redundancy Configurations
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Cluster Planning 4-9 Planning Quad Redundancy Configurations For the highest possible level of I/O path redundancy, you can configure your cluster for quad redundancy. This configuration provides four host adapters in each of at least four nodes and four Fibre Channel SAN Switches for each redundant Fibre Channel Fabric. The recommended quad redundancy configuration includes these I/O path components: I At least four cluster nodes I Four host adapters in each node I Four Fibre Channel SAN Switches in each redundant Fibre Channel Fabric I Two dual-port array controllers in each storage subsystem I Fibre Channel cables and GBIC-SW modules for the connections between the nodes and the Fibre Channel SAN Switches, and between the Fibre Channel SAN Switches and the storage subsystems In a quad redundancy configuration, both ports on both array controllers in each storage subsystem access the same storagesets. Thus, up to three of the four paths between the controllers and the shared data can fail and the cluster nodes can still access the shared data. In addition, quad redundancy provides continued access to shared storage in the event of multiple component failures in the I/O paths between the nodes and the array controllers. For example, up to three host adapters in a node can fail, or up to three Fibre Channel SAN Switches can fail, and the nodes can still access shared storage over a path containing functioning components. Figure 4-2 shows an example of a quad redundancy configuration in a redundant Fibre Channel Fabric. In this example, the following connections are made: I Each of four host adapters in each node connects to the same-numbered Fibre Channel SAN Switch (host adapter 1 to Fibre Channel SAN Switch #1, host adapter 2 to Fibre Channel SAN Switch #2, host adapter 3 to Fibre Channel SAN Switch #3, host adapter 4 to Fibre Channel SAN Switch #4). I The two odd-numbered Fibre Channel SAN Switches connect to port 1 of the array controllers. Fibre Channel SAN Switch #1 connects to array controller A, port 1 in each storage subsystem. Fibre Channel SAN Switch #3 connects to array controller B, port 1 in each storage subsystem.