16.2.2 Notes on application failover

This subsection provides additional useful information about application failover.

In the application failover configuration, NNMi fails over when its server stops, but does not fail over when an NNMi process stops (except for nnmcluster). For details, see 16.4.2 Application failover scenarios.

If you want NNMi to fail over when an NNMi process stops, use an HA configuration that is based on HA cluster software.
There is no functionality for providing a report when the standby server stops (the state in which no switchover target is available).
There is no functionality for executing user-specified commands for performing some processing when failover occurs.
The IP address of the server on which NNMi runs switches when failover occurs. The IP address is not inherited. Therefore, note the following points:
- Set up the SNMP trap transmission target in both NNMi management servers.
- Register the bookmarks of both NNMi management servers in the web browser, and connect it to the active server.
Back up data periodically so that you will be able to use the backed up data in the unlikely event of a system failure. The data duplicated in the standby server by the application failover feature cannot be used as a substitute for a backup.
In the application failover configuration, the database requires three times the amount of disk space that would be needed in an ordinary configuration. For details about database configuration, see 16.4.1 Application failover behavior.