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Oracle10g Grid Computing with RAC
Chapter 3 - High Performance and Highly Available
Database Clusters

IBM Parallel SysPlex Architecture

The S/390 Parallel Sysplex follows the Shared Disk model approach with all nodes (or MVS systems) accessing the disks concurrently. The cluster is built in with ‘coupling facility’, which addresses the global concurrency issues involved in the shared-data scheme. The Coupling Facility is a special hardware component with proprietary microcode.

To share data with in the parallel cluster, DB2 subsystems must belong to a predefined data-sharing group. All members of a data-sharing group use the same shared DB2 catalog and directory.

DB2 data sharing implementation [Fig 3.12] Parallel Sysplex environment, which usually consists of:

  • At least one coupling facility — a component that manages the shared resources of the connected central processor complexes (CPCs).

  • At least one Sysplex Timer, which keeps the processor timestamps synchronized in the data-sharing group.

  • A connection to shared DASD (Direct access storage device), where user data, system catalog and directory data, and MVS catalog data all reside.

  • One or more CPCs, consisting of main storage, central processors, timers, and channels, that can attach to a coupling facility.


Figure 3.12 IBM Parallel SysPlex System

For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.

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