A DB2 pureScale cluster is made up of number of servers which are connected together, a shared area of disk and some software that all work together to provide a high performance and resilient database.
The cluster is made up of a number of "controllers" or Coupling facilities (CF) and a number of members.
- Provide centralized locking and caching.
- Do not run DB2 and do not perform what you might think of as the normal work of the database i.e. processing queries.
- Run DB2 and do what you might think of as the normal work of the database i.e. processing queries
- Access the centralized locking and caching provided by the CF.
- Use Remote Direct Memory Access (RDMA) to communicate very quickly with the rest of the cluster.
There are normally 2 or more members. The number of members can be increased to add more processing power to the cluster.