AIX POWERHA/HACMP: Basic commands -

POWERHA/HACMP: Basic commands

# IBM PowerHA (formerly HACMP) is IBM's solution for high-availability clusters on the AIX
# Unix and Linux for IBM System p platforms and stands for High Availability Cluster
# Multiprocessing.

# 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 systems can be shared between systems in the cluster.

# - PowerHA 7.1 was released in 2010 and uses the Cluster Aware AIX (CAA) infrastructure
#   available in AIX V6.1 TL 6 and AIX 7.1
# - PowerHA 6.1, Rebranded again to IBM PowerHA SystemMirror for AIX, GA Oct 27 2009
# - HACMP 5.5, Rebranded to IBM PowerHA, GA Nov 2008
# - HACMP 5.4.1, Nov 2007
# - HACMP 5.4, July 2006
# - HACMP 5.3, August 2005
#   [...]

# HACMP SPECIFICS
# ------------------------------------------------------------------------------------------
# * Heartbeat is implemented via a shared Heartbeat disk
# * Fallback policy: possibility of automatic fallback
# * File collection synchronization
# * Cluster validation test (DON'T RUN AS IT MAKES A FULL SET OF TESTS INCLUDING CRASH, etc)

# Show cluster state (continuous output)
# ------------------------------------------------------------------------------------------

root@<server>:/root#> clstat [ -r interval ]

   Cluster status: stable | unstable | reconfig

# Show cluster state (not continuous output)
# ------------------------------------------------------------------------------------------

root@<server>:/root#> cldump

# Check cluster daemons
# ------------------------------------------------------------------------------------------

root@<server>:/root#> lssrc -g cluster

Subsystem         Group            PID          Status
clstrmgrES       cluster          50136        active
clinfoES         cluster          139308       active

# Reduced information about ressource groups
# ------------------------------------------------------------------------------------------

root@<server>:/root#> clRGinfo

# RG (Ressource Group): Formed by IP, LVM, AS (application server) & AM (application monitor)
#
# Ressource Group parameters:
#   - Startup policy
#   - Failover policy
#   - Fallback policy
#   - Site policy: for long-distance intersite clusters

# Complete information about application servers
# ------------------------------------------------------------------------------------------

root@<server>:/root#> cldisp

# ------------------------------------------------------------------------------------------

root@<server>:/root#> smitty [ hacmp | powerha ]