IBM SG24-5131-00 manual Initial Startup, Takeover and Reintegration

4.4.2 Initial Startup

At this point in time, the cluster is not yet started. So the cluster manager has to be started first. To check whether the cluster manager is up, you can either look for the process with the ps command:

ps -ef grep clstr

or look for the status of the cluster group subsystems:

lssrc -g cluster

or look for the status of the network interfaces. If you have IP Address Takeover (IPAT) configured you should see that the network interface is on its boot address with the netstat -icommand.

Then start HACMP through smit clstart. In the panel that appears, choose the following parameters and press Enter:

1.start now

2.broadcast message true

3.start cluster lock services false

4.start cluster information daemon true

Reissue either the ps command (see above) or look for the interface state with the netstat -icommand. Now, you should see that the boot interface is gone in favor of the service-interface.

You also would like to check whether a takeover will work, so, you have to bring up HACMP on all cluster nodes through smitty clstart and check whether the cluster gets into a stable state. Use clstat for this purpose.

4.4.3 Takeover and Reintegration

When the cluster is up and running, stop one of the node’s cluster managers with smitty clstop and choose graceful with takeover. One possibility to check whether the takeover went through smoothly is to look at the /tmp/hacmp.out file during the takeover, preferably on the takeover node. You can use the tail -f /tmp/hacmp.out command for this.

After the cluster has become stable, you might check the netstat -ioutput again to verify that the takeover node has acquired the IP address of the “failed” node.

112 IBM Certification Study Guide AIX HACMP