Managing Serviceguard 13th Edition, February 2007

Understanding Serviceguard Software Components
Serviceguard Architecture
Chapter 360
Then force inetd to re-read inetd.conf:
/usr/sbin/inetd -c
You can check that this did in fact disable Serviceguard by trying the
following command:
cmquerycl -n nodename
where nodename is the name of the local system. If the command fails,
you have successfully disabled Serviceguard.
NOTE You should not disable Serviceguard on a system on which it is actually
running. If you are not sure, you can get an indication by means of the
command:
ps -e | grep cmclconfd
If there are cmclconfd processes running, it does not mean for certain
that Serviceguard is running on this system (cmclconfd could simply be
handling UDP queries from a Serviceguard cluster on the same subnet)
but it does mean you should investigate further before disabling
Serviceguard.
Cluster Daemon: cmcld
This daemon determines cluster membership by sending heartbeat
messages to cmcld daemons on other nodes in the Serviceguard cluster.
It runs at a real time priority and is locked in memory. The cmcld
daemon sets a safety timer in the kernel which is used to detect kernel
hangs. If this timer is not reset periodically by cmcld, the kernel will
cause a system TOC (Transfer of Control), which is an immediate system
halt without a graceful shutdown. This could occur because cmcld could
not communicate with the majority of the cluster’s members, or because
cmcld exited unexpectedly, aborted, or was unable to run for a significant
amount of time and was unable to update the kernel timer, indicating a
kernel hang. Before a TOC resulting from the expiration of the safety
timer, messages will be written to /var/adm/syslog/syslog.log and
the kernel’s message buffer, and a system dump is performed.
The duration of the safety timer depends on the cluster configuration
parameters HEARTBEAT_INTERVAL and NODE_TIMEOUT, and also on the
characteristics of the cluster configuration, such as whether it uses a
quorum server or a cluster lock (and what type of lock) and whether or