Managing Serviceguard Eighteenth Edition, September 2010

You still need to have redundant networks, but you do not need to specify any heartbeat
LANs, since there is no other node to send heartbeats to. In the cluster configuration
file, specify all the LANs that you want Serviceguard to monitor. Use the
STATIONARY_IP parameter, rather than HEARTBEAT_IP, to specify LANs that already
have IP addresses. For standby LANs, all that is required is the NETWORK_INTERFACE
parameter with the LAN device name.
Single-Node Operation
Single-node operation occurs in a single-node cluster or in a multi-node cluster,
following a situation where all but one node has failed, or where you have shut down
all but one node, which will probably have applications running. As long as the
Serviceguard daemon cmcld is active, other nodes can rejoin the cluster at a later time.
If the Serviceguard daemon fails when in single-node operation, it will leave the single
node up and your applications running. This is different from the loss of the
Serviceguard daemon in a multi-node cluster, which halts the node with a system reset,
and causes packages to be switched to adoptive nodes.
It is not necessary to halt the single node in this scenario, since the application is still
running, and no other node is currently available for package switching.
However, you should not try to restart Serviceguard, since data corruption might occur
if the node were to attempt to start up a new instance of the application that is still
running on the node. Instead of restarting the cluster, choose an appropriate time to
shutdown and reboot the node, which will allow the applications to shut down and
then permit Serviceguard to restart the cluster after rebooting.
Disabling identd
Ignore this section unless you have a particular need to disable identd.
You can configure Serviceguard not to use identd.
CAUTION: This is not recommended. Disabling identd removes an important security
layer from Serviceguard. See the white paper Securing Serviceguard at www.hp.com/
go/hpux-serviceguard-docs for more information.
If you must disable identd, you can do so by adding the -i option to the tcp
hacl-cfg and hacl-probe commands in /etc/inetd.conf.
For example:
1. Change the cmclconfd entry in /etc/inetd.conf to:
hacl-cfg stream tcp nowait root /usr/lbin/cmclconfd cmclconfd -c -i
2. Change the cmomd entry in /etc/inetd.conf to (all on one line):
276 Building an HA Cluster Configuration