AIX (Advanced Interactive eXecutive) is a series of proprietary Unix operating systems developed and sold by IBM.
Performance Optimization With Enhanced RISC (POWER) version 7 enables a unique performance advantage for AIX OS.
POWER7 features new capabilities using multiple cores and multiple CPU threads, creating a pool of virtual CPUs.
AIX 7 includes a new built-in clustering capability called Cluster Aware
AIX POWER7 systems include the Active Memory Expansion feature.

Wednesday, December 26, 2012

TESTING HACMP: HA FAILOVER SCENARIOS

1. Graceful

For graceful failover, you can run “smitty clstop” then select graceful option. This will not change
anything except stopping the cluster on that node.
Note: If you stop the cluster, check the status using lssrc –g cluster, sometimes clstrmgrES daemon will
take long time to stop, DO NOT KILL THIS DAEMON.It will stop automatically after a while.
You can do this on both the nodes

2. Takeover

For takeover, run “smitty clstop” with takeover option, this will stop the cluster on that node and the standby node will take over the pakage
You can do this on both the nodes

3. Soft Pakckage Failover

Run smitty cm_hacmp_resource_group_and_application_management_menu >>>Move a Resource Group to Another Node >>>>select the package name and node name
>>>enter

This will move the package from that node to the node that you have selected in the above menu. 

This method will give lot of troubles in HA 4.5 whereas it runs good on HA 5.2 unless we have any apps startup issues.
You can do this on both the nodes

4. Failover Network Adapter(s):

For this type of testing , run “ifconfig enx down” , then package IP will failover to primary adapter. You can not even see any outage or anything.
We can manually (ifconfig enx up) bring it back to original adapter , but better to reboot the server to bring the package back to the original node

5. Hardware Failure (crash):

This is a standard type of testing; run the command “reboot –q” then the node will godown without

stopping any apps and come up immediately. The package will failover to the standby node with in  min os downtime (Even tough HA failover is fast, some apps will take long time to start