Compaq ProLiant 8500 Compaq Parallel Database Cluster Model PDC/05000 for Orac - Page 45
I/O Path Configuration Examples for Redundant Fibre Channel Fabrics
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Cluster Architecture 2-21 I/O Path Configuration Examples for Redundant Fibre Channel Fabrics Every I/O path connection between host adapters and array controller ports is active at the same time. An active port does not become inactive unless it fails, whereupon all I/O activity on the failed path is automatically switched over to the pre-defined backup I/O path. Dual Redundancy Configuration Example In a redundant Fibre Channel Fabric, a dual redundancy configuration is the minimum allowable configuration that provides redundancy along the I/O paths. This configuration provides two of each component along the I/O paths. These include at least two nodes, two host adapters in each node, and two Fibre Channel SAN Switches. Figure 2-9 shows the correct method for cabling the I/O path components in a dual redundancy configuration. In this example, both Fibre Channel SAN Switches connect to port 1 on one array controller and to port 2 on the other array controller in each MA8000/EMA12000 Storage Subsystem. If one Fibre Channel SAN Switch fails, the other switch still has access to port 1 on one array controller and port 2 on the other array controller in each storage subsystem. This ensures that the host adapters can still access the full range of LUNs.