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You can enable a preonline check of a failover IP address to protect against network partitioning. The check pings a service group's configured IP address to verify that it is not already in use. If it is, the service group is not brought online.
A second check verifies that the system is connected to its public network and private network. If the system receives no response from a broadcast ping to the public network and a check of the private networks, it determines the system is isolated and does not bring the service group online.
To enable the preonline IP check, do one of the following:
If preonline trigger script is not already present, copy the preonline trigger script from the sample triggers directory into the triggers directory:
# cp /opt/VRTSvcs/bin/sample_triggers/VRTSvcs/preonline_ipc /opt/VRTSvcs/bin/triggers/preonline
Change the file permissions to make it executable.
If preonline trigger script is already present, create a directory such as /preonline and move the existing preonline trigger as T0preonline to that directory. Copy the preonline_ipc trigger as T1preonline to the same directory.
If you already use multiple triggers, copy the preonline_ipc trigger as TNpreonline, where TN is the next higher TNumber.