HP Integrity Virtual Machines 4.3: Installation, Configuration, Administration

4. Ensure that the VM package is running on the desired node.
5. Verify failover and online migration function as expected prior to placing systems into
production.
10.6 Troubleshooting Network Problems When Using Serviceguard
If the guest has network problems after failover:
• Make sure the vswitches are configured on the adoptive node. If you are using the VLAN
feature of Integrity VM vswitches, make sure that appropriate VLAN IDs are assigned to
each port.
• Adjust the values of the following Serviceguard parameters in the cluster configuration file.
The correct settings for the HEARTBEAT_INTERVAL and the NODE_TIMEOUT parameter are
system- and load-dependent.
— The HEARTBEAT_INTERVAL parameter specifies the normal interval between the
transmission of heartbeat messages from one node to the other in the cluster. The value
of the HEARTBEAT_INTERVAL parameter is entered in microseconds; the default value
is 1,000,000 microseconds. Setting the value of this parameter to less than the default is
not recommended. The default should be used where possible. The maximum value
recommended is 15 seconds, and the maximum value supported is 30 seconds. This
value should be at least half the value of the NODE_TIMEOUT parameter.
— The NODE_TIMEOUT parameter specifies the amount of time after which the Serviceguard
node can determine that the other node is unavailable and can initiate cluster
reformation. This parameter is entered in microseconds; the default value is 2,000,000.The
minimum is two times the value of the HEARTBEAT_INTERVAL parameter. The
maximum recommended value for this parameter is 30,000,000. The default setting
yields the fastest cluster reformations. However, using the default value increases the
potential for spurious reformations because of momentary system hangs or network-load
spikes. For many installations, a setting of 5,000,000 to 8,000,000 (5 to 8 seconds) is more
appropriate. The maximum value recommended is 30 seconds and the maximum value
supported is 60 seconds.
222 Using HP Serviceguard with Integrity VM