Compaq ProLiant 8500 Compaq Parallel Database Cluster Model PDC/O2000 for Orac - Page 69
I/O Data Paths in a Redundant FCAL, Fibre Host AdaptertoStorage Hub/Switch Paths, Paths
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Cluster Architecture 2-45 I/O Data Paths in a Redundant FC-AL A distinct I/O path connection exists between each Fibre Host Adapter in a cluster node and every array controller port in each RA4000/RA4100 Array in the redundant FC-AL. Fibre Host Adapter-to-Storage Hub/Switch Paths Figure 2-18 highlights the I/O data paths that run between the Fibre Host Adapters and the Storage Hubs or FC-AL Switches in a redundant FC-AL. Fibre Host Adapters (2) FC-AL Node 1 Switch/Storage Hub #1 Fibre Host Adapters (2) Node 2 FC-AL Switch/Storage Hub #2 RA4000/4100 Array #1 RA4000/4100 Array #2 Figure 2-18. Fibre Host Adapter-to-FC-AL Switch/Storage Hub data paths Secure Path monitors the status of the components along each active path. If Secure Path detects the failure of a Fibre Host Adapter, Fibre Channel cable, Storage Hub, or FC-AL Switch along an active path, it automatically transfers all I/O activity on that path to the components on the defined backup path.