Compaq ProLiant 8500 Compaq Parallel Database Cluster Model PDC/05000 for Orac - Page 21
Clusters Defined
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1-2 Compaq Parallel Database Cluster Model PDC/O5000 for Oracle8i and Windows 2000 Administrator Guide Clusters Defined A cluster is an integration of software and hardware products that enables a set of loosely coupled servers and shared storage subsystem components to present a single system image to clients and to operate as a single system. As a cluster, the group of servers and shared storage subsystem components offers a level of availability and scalability far exceeding that obtained if each cluster node operated as a stand-alone server. The PDC/O5000 uses the Oracle8i Parallel Server software, which is a parallel database that can distribute its workload among the cluster nodes. Refer to Chapter 3, "Cluster Software Components" to determine the specific releases your cluster kit supports. Figure 1-1 shows an example of a PDC/O5000 that includes two nodes (Compaq ProLiant™ servers), two sets of storage subsystems, two Compaq StorageWorksTM Fibre Channel SAN Switches or Compaq StorageWorks Fibre Channel Storage Hubs, a redundant cluster interconnect, and a client local area network (LAN).