Short Description: The interval in which the cluster servers probe each other for availability.
It is important that the server not have a long cluster probe time, which will result in the cluster information not being refreshed as often. The default probe time is one (1) minute, however this can be changed with the following NOTES.INI parameter: Server_Cluster_Probe_Timeout=Number in minutes This is the interval at which the cluster servers probe each other for availability.
Valid up to 120 (minutes)
Can cause serious performance issues if set too fast depending on the server’s load.
Domino 7 Performance Tuning Redbook
Redbook: Domino 7 Performance Tuning