PRIMECLUSTER Global Link Services Configuration and Administration Guide: Redundant Line Control Function 4.1 (for Solaris(TM) Operating System)

3.6.8 Monitoring the remote host

Sets a function to monitor if or not possible to communicate with a GS/SURE system (the other end of communication), that becomes the other end of communication when operating GS/SURE linkage mode. To set monitor-to, use the "hanetobserv" command. See "7.5 hanetobserv Command" as to how to set it. To set an interval to monitor, use the "hanetpoll" command. See "7.7 hanetpoll Command" as to how to set it.

It is necessary to set GS/SURE linkage mode (the operation mode is "c") before executing this setting.

If the local system is running on a clustered system, it switches a node when GS/SURE system (remote host) stops. During this process, if no response is returned from any of the defined monitored remote system by executing "hanetobserv" command, it is recognized as a local NIC failure and it switches the node. Moreover, even though all the GS/SURE system (remote host) stops operating, all monitored remote system does not return responses, and there occurred an unnecessary switching. To avoid this, it is possible to interoperate operational node and standby node to monitor network failures. So that if all the remote system stops operating, it does not mistakenly switch the node.

If operating the cluster, use the "hanetobserv" command to monitor from both operational node and standby command. Keep in mind that since it is necessary to identify the remote node from both operational and standby node, a take-over IP address must be used for a virtual IP address.