DB2 V10.5 PureScale支持HADR

DB2 V10.5 PureScale支持HADR

PureScale是DB2 V9.8引入的share disk的集群解决方案。而HADR则是DB2的V8版本就已经存在的灾备解决方案。

在v10.5之前, PureScale不支持HADR。但是从10.5开始。PureScale开始支持HADR。

IBM® DB2® pureScale® Feature was originally introduced in Version 9.8. DB2 Version 10.5 continues to build on DB2 pureScale Feature support.

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In addition, V10.5 introduces HADR support in a DB2 pureScale environment and leverages work load balancing.

虽然有了支持，但还是有些明显的限制。

Restrictions for HADR in DB2 pureScale environments

* There are a number of restrictions that you should be aware of if you are planning to deploy HADR in a DB2® pureScale® environment.

* The restrictions are as follows:
* The HADR synchronization modes SYNC and NEARSYNC are not supported. You must specify either the ASYNC or SUPERASYNC option for the hadr_syncmode configuration parameter.
* A peer window is not supported because it requires either SYNC or NEARSYNC to be the synchronization mode.
* You cannot have more than one HADR standby database.
* The topology of the primary and the standby must be synchronized. If you add a member on the primary, that operation is replayed on the standby. If you drop a member on the primary, you must reinitialize the standby by using a backup or a split mirror from the primary's new topology.
* The reads on standby feature is not supported.
* You cannot use the integrated cluster manager, IBM® Tivoli® System Automation for Multiplatforms (SA MP), to manage automated failover; it manages high availability within the local cluster only.
* Network address translation (NAT) between the primary and standby sites is not supported.