Managing HP Serviceguard for Linux, Tenth Edition, September 2012

IMPORTANT: HP strongly recommends using
the default. Changing this value can affect how
quickly the link-level and IP-level monitors detect
a network failure. See “Monitoring LAN Interfaces
and Detecting Failure: Link Level” (page 75).
Can be changed while the cluster is running.
SUBNET IP address of a cluster subnet for which IP
Monitoring can be turned on or off (see
IP_MONITOR). The subnet must be configured
into the cluster, via NETWORK_INTERFACE and
either HEARTBEAT_IP or STATIONARY_IP. All
entries for IP_MONITOR and POLLING_TARGET
apply to this subnet until the next SUBNET entry;
SUBNET must be the first of each trio.
By default, each of the cluster subnets is listed
under SUBNET, and, if at least one gateway is
detected for that subnet, IP_MONITOR is set to
ON and POLLING_TARGET entries are populated
with the gateway addresses, enabling target
polling; otherwise the subnet is listed with
IP_MONITOR set to OFF.
See “Monitoring LAN Interfaces and Detecting
Failure: IP Level” (page 75) for more information.
Can be changed while the cluster is running; must
be removed, with its accompanying IP_MONITOR
and POLLING_TARGET entries, if the subnet in
question is removed from the cluster configuration.
IP_MONITOR Specifies whether or not the subnet specified in
the preceding SUBNET entry will be monitored at
the IP layer.
To enable IP monitoring for the subnet, set
IP_MONITOR to ON; to disable it, set it to OFF.
By default IP_MONITOR is set to ON if a gateway
is detected for the SUBNET in question, and
POLLING_TARGET entries are populated with the
gateway addresses, enabling target polling. See
the POLLING_TARGET description that follows
for more information.
Cluster Configuration Planning 117