High Availability Cluster Multi-Processing for AIX Concepts and Facilities Guide
The IBM tool for building UNIX-based mission-critical computing platforms is the HACMP software. The HACMP software ensures that critical resources, such as applications, are available for processing. HACMP has two major components: high availability (HA) and cluster multi-processing (CMP).
The primary reason to create HACMP clusters is to provide a highly available environment for mission-critical applications. For example, an HACMP cluster could run a database server program which services client applications. The clients send queries to the server program which responds to their requests by accessing a database, stored on a shared external disk. In an HACMP cluster, to ensure the availability of these applications, the applications are put under HACMP control. HACMP takes measures to ensure that the applications remain available to client processes even if a component in a cluster fails. To ensure availability, in case of a component failure, HACMP moves the application (along with resources that ensure access to the application) to another node in the cluster.
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