IBM PowerHA SystemMirror (formerly IBM PowerHA and HACMP) is IBM's solution for

high-availability cluster High-availability clusters (also known as HA clusters, fail-over clusters) are groups of computers that support server applications that can be reliably utilized with a minimum amount of down-time. They operate by using high availability softwa ...

s on the

AIX Aix or AIX may refer to: Computing * AIX, a line of IBM computer operating systems *An Alternate Index, for a Virtual Storage Access Method Key Sequenced Data Set * Athens Internet Exchange, a European Internet exchange point Places Belgi ...

Unix Unix (; trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and ot ...

and

Linux Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...

for

IBM System p The IBM System p is a high-end line of RISC (Power)/UNIX-based servers. It was the successor of the RS/6000 line, and predecessor of the IBM Power Systems server series. History The previous RS/6000 line was originally a line of workstations and ...

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). Data on

file system In computing, file system or filesystem (often abbreviated to fs) is a method and data structure that the operating system uses to control how data is stored and retrieved. Without a file system, data placed in a storage medium would be one larg ...

s can be shared between systems in the cluster. PowerHA relies heavily on IBM's Reliable Scalable Cluster Technology (RSCT). PowerHA is an RSCT aware client. RSCT is distributed with AIX. RSCT includes a daemon called group services that coordinates the response to events of interest to the cluster (for example, an interface or a node fails, or an administrator makes a change to the cluster configuration). Up until PowerHA V6.1, RSCT also monitored cluster nodes, networks and network adapters for failures using the topology services daemon (''topsvcs''). In the current release (V7.1), RSCT provides coordinate response between nodes, but monitoring and communication are provided by the Cluster Aware AIX (CAA) infrastructure. 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. CAA replaces the function provided by Topology Services (topsvcs) in RSCT in previous releases of PowerHA/HACM

IBM PowerHA SystemMirror Timeline

IBM PowerHA SystemMirror Releases

* PowerHA SystemMirror 7 ** PowerHA SystemMirror 7.2, released in

*** PowerHA SystemMirror 7.2.1, released in . **** New User Interface. ** PowerHA SystemMirror 7.1 was released in , and uses the Cluster Aware AIX (CAA) infrastructure available in AIX V6.1 TL 6 and AIX 7.

*** PowerHA SystemMirror 7.1.1 . * PowerHA 6 ** PowerHA 6.1, Rebranded again to IBM PowerHA SystemMirror for AIX, GA Oct 27 2009

*** Now in Standard and Enterprise Editions *** EMC SRDF support *** GLVM 2-site Configuration Wizard *** Improvements to SMIT panels and File Collections *** IPv6 support * HACMP 5 ** HACMP 5.5, Rebranded to IBM PowerHA, GA Nov 2008

*** Asynchronous replication support *** Updated support for DLPAR/CUOD to include support for IBM POWER5 and POWER6 processors *** Support for LPAR mobility to relocate critical applications *** PowerHA/XD PPRC support of Global Mirror when used with SAN Volume Controller *** Function to allow PowerHA/XD PPRC to support multiple storage subsystems at each site *** Better integration with the AIX operating system by avoiding modifications to the TCP/IP bringing up process ** HACMP 5.4.1, Nov 2007
announcement
*** AIX Workload Partitions support (WPAR) *** New GLVM monitoring ***

NFSv4 Network File System (NFS) is a distributed file system protocol originally developed by Sun Microsystems (Sun) in 1984, allowing a user on a client computer to access files over a computer network much like local storage is accessed. NFS, li ...

support improvements ** HACMP 5.4, July 2006
announcement
*** Web-based GUI *** Nondisruptive HACMP cluster startup, upgrades, and maintenance ** HACMP 5.3, August 2005 ** HACMP 5.2, July 2004 ** HACMP 5.1, July 2003 * HACMP 4 ** HACMP 4.5, July 2002 ** HACMP 4.4, June 2000 ** HACMP 4.3 ** HACMP 4.2 *** Adds Cluster Single Point of Control (CSPOC) feature *** Dynamic Reconfig

References

{{Reflist

External links

HACMP Homepage

HACMP/PowerHA Hints and Tips

HACMP for AIX Certified Systems Expert Requirements

HACMP Version Compatibility Matrix

PowerHA Technical Forum

AIX Health Check
High Availability Cluster Multiprocessing High-availability cluster computing Cluster computing

IBM PowerHA SystemMirror Timeline

IBM PowerHA SystemMirror Releases

See also

References

External links