A centralized session manager would be nice, but I for one haven't been able to find a decent solution for use with PHP. I don't know about other systems or APIs. Msession is dead (I still have it running, but any attempt to build a stable daemon on an up-to-date system failed ...
Each Sun Cluster data service supplies a fault monitor that periodically probes the data service to determine its health. A fault monitor verifies that the application daemon(s) are running and that clients are being served. Based on the information returned by probes, predefined actions, such as...