High-availability cluster multiprocessing

Meaning – The term high-availability cluster multiprocessing, refers to the application service that enables up to eight RS/6000 servers to access the same data in parallel. This optimizes application execution and scalability and protects against unplanned outages and server downtime.

It is IBM’s solution for high-availability clusters on the AIX Unix and Linux for IBM System platforms and stands for High Availability Cluster Multiprocessing. IBM’s HACMP product was first shipped in 1991 and is now in its 20th release – PowerHA SystemMirror for AIX 7.1.

PowerHA can run on up to 32 computers or nodes, each of which is either actively running an application (active) or waiting to take over when another node fails (passive).

Example of usage“The 7.1 release of PowerHA relies heavily on CAA, a clustering infrastructure built into the operating system and exploited by RSCT and PowerHA. CAA provides the monitoring and communication infrastructure for PowerHA and other clustering solutions on AIX, as well as cluster-wide event notification using the Autonomic Health Advisor File System (AHAFS) and cluster-aware AIX, commands with clcmd.”