Note the following considerations to prevent duplicate alert actions from being executed by a redundant Operations Sentinel server.
Each Operations Sentinel server in an environment of resilient Operations Sentinel servers must use dedicated terminal/communications server ports for its alert policy. The terminal/communications server considers each server a separate application contending for the port.
If you do not want duplicate external alert notifications, such as duplicate paging messages, make sure one of the following occurs:
The active alert policies on the primary and secondary server do not perform duplicate alert actions.
Only one of the Operations Sentinel servers receives the alert notification.
See the Operations Sentinel Administration and Configuration Guide for more information.