The pureScale environment is a Db2 9.8 feature that provides a scalable active-active configuration that transparently delivers high throughput and continuous availability for any business-critical system. From an architectural standpoint, Db2 pureScale leverages the architecture and design principles of the Db2 z/OS sysplex architecture that was introduced in the early 1990s:
Db2 pureScale architecture
The preceding diagram shows the pureScale components, which are broadly classified as follows:
- Db2 members
- Cluster-caching facility (CF)
- Shared storage
- Cluster services and interconnect
A Db2 member is the core processing engine within the pureScale cluster. A member is similar to a single partition Db2 and contains the following features:
- The system controller process (db2sysc)
- The watch dog process (db2wdog)
- Local buffer pools
- Lock list
- Database...