Compaq ProLiant 8500 Compaq Parallel Database Cluster Model PDC/O2000 for Orac - Page 22
Clusters Defined
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1-2 Compaq Parallel Database Cluster Model PDC/O2000 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/O2000 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/O2000 that includes two nodes (ProLiantTM servers), two Compaq StorageWorks RAID Array 4000s or 4100s (RA4000/RA4100 Arrays), two Compaq StorageWorksTM Fibre Channel Storage Hubs, Compaq StorageWorks FC-AL Switches, or Compaq StorageWorks Fibre Channel SAN Switches, a cluster interconnect, and a client local area network (LAN). Switch/Hub Client LAN Cluster Interconnect Fibre Host Adapters (2) Fibre Host Adapters (2) Node 1 Storage Hub/Switch #1 Node 2 Storage Hub/Switch #2 RA4000/4100 Array #1 RA4000/4100 Array #2 Figure 1-1. Example of a two-node Compaq Parallel Database Model PDC/O2000 cluster The PDC/O2000 can use redundant Fibre Channel Fabric Storage Area Network (SAN) and redundant Fibre Channel Arbitrated Loop (FC-AL) SAN topologies. These two SAN topologies support the use of multiple redundant fabrics or loops, respectively. In the example shown in Figure 1-1, the clustered nodes are connected to the database on the shared storage subsystems through a redundant Fibre Channel Fabric or redundant FC-AL. Clients access the database through the client LAN, and the cluster nodes communicate across an Ethernet cluster interconnect.