||Oracle Tips by Burleson
Oracle10g Grid Computing
Chapter 3 - High
Performance and Highly Available
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
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
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