We run a cluster of ColdFusion 8 servers on top of the Sun JVM, version 1.6.0_11. Occasionally a server will simply stop responding to requests. We've determined so far that the JVM is locking up and that neither ColdFusion nor IIS are the root of the problem. I've included our JVM arguments below. Any additional JVM settings we should be looking at? Any tools to monitor, trace, or get metrics from inside the JVM so we can see what it's doing when the crashes occur? Any other JVM troubleshooting tips?
-server -Xms1024m -Xmx1024m -Dsun.io.useCanonCaches=false -XX:MaxPermSize=256m -XX:PermSize=256m -XX:+UseParallelGC -Dsun.rmi.dgc.client.gcInterval=300000 -Dsun.rmi.dgc.server.gcInterval=300000 -Djmx.invoke.getters=true