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112 IBM Certification Study Guide AIX HACMP
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 -i command.
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 -i command. 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 -i output
again to verify that the takeover node has acquired the IP address of the
“failed” node.