Compaq ProLiant 6500 Compaq Parallel Database Cluster Model PDC/O1000 for Orac - Page 51
Ethernet switches or hubs provided for the cluster interconnect. The bottom
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2-28 Compaq Parallel Database Cluster Model PDC/O1000 for Oracle8i and Windows 2000 Administrator Guide Because Ethernet switches are required in PDC/O1000 clusters with three or more nodes, using an Ethernet switch instead of a crossover cable makes it easier to upgrade the cluster interconnect if more servers are added to the cluster. IMPORTANT: Crossover cables and Ethernet hubs cannot be used in PDC/O1000 clusters with a redundant Ethernet cluster interconnect or in PDC/O1000 clusters with three or more nodes. Figure 2-14 shows the redundant Ethernet cluster interconnect components used in a two-node PDC/O1000 cluster. Ethernet Switch/Hub #2 for Cluster Interconnect Dual-port Ethernet Adapters (2) Ethernet Switch/Hub #1 for Cluster Interconnect Crossover Cable Dual-port Ethernet Adapters (2) Node 1 Crossover Cable Client LAN Hub/Switch #2 Node 2 Client LAN Hub/Switch #1 Figure 2-14. Redundant Ethernet cluster interconnect for a two-node PDC/O1000 cluster These components include two dual-port Ethernet adapters in each cluster node. The top port on each adapter connects by Ethernet cable to one of two Ethernet switches or hubs provided for the cluster interconnect. The bottom port on each adapter connects by Ethernet cable to the client LAN for the cluster. A crossover cable is installed between the two Ethernet switches or hubs used in the Ethernet cluster interconnect.