DB2 10.5 for Linux, UNIX, and Windows

HADR is now supported in a DB2 pureScale environment

DB2® pureScale® environments now support DB2 high availability disaster recovery (HADR). This enhancement combines the continuous availability of the DB2 pureScale Feature with the robust disaster recovery capabilities of HADR.

Often, there is a trade-off when you want to meet both your high availability needs and disaster recovery needs with a single product. The DB2 pureScale Feature offers outstanding availability, resilience, and scalability. Among its features are built-in failure detection, recovery automation, and a data sharing architecture, all of which help prevent impacts from most unplanned outages. However, normally you do not distribute DB2 members across different geographic locations, so there is little disaster recovery protection. HADR, in contrast, excels at providing local high availability or remote disaster recovery.

In previous releases, HADR was not supported in DB2 pureScale environments, so if you wanted to provide a disaster recovery solution, you had to deploy another product such as InfoSphere® Q Replication or Change Data Capture. Integration of HADR with the DB2 pureScale Feature, however, provides a number of advantages:

Better synchronization. Both SUPERASYNC and ASYNC synchronization modes are supported in DB2 pureScale environments.
DDL support. HADR replicates DDL operations.
Ease of use. HADR is easy to configure and maintain.
Native takeover support. By using the TAKEOVER HADR command, you can perform either a graceful takeover (role switch) or a forced takeover (failover).