Sun Cluster HA for Lotus Fault Probes

The Sun Cluster HA for Lotus fault probe has two parts--a local probe that runs on the node on which the Lotus Domino server processes are currently running, and a remote probe that runs on all other nodes that are possible masters of the Lotus Domino server's logical host.

Both probes use a simple telnet connection to the Lotus Domino port to check the status of the Domino server. If a probe fails to connect, it initiates a failover or takeover by invoking the hactl(1M) command.

The local fault probe can perform three local restarts before initiating a failover. The local restart mechanism uses a sliding time window algorithm; only when the number of retries is exhausted within that window does a failover occur.