From what I have read and understood this directory is used for the scheduling service in order to avoid scheduled tasks being executed by each node of a cluster.
Does it work using netboot? I ask because it seems not to. This is using the "all" configuration with a HA JMS queue, and using netboot of course.
12:28:01,390 WARN [JARDeployer] Failed to add deployable jar: file:/ms/svc/appserver/jboss4-netboot/server/fish/tmp/deploy/tmp43495deploy-hasingleton java.util.zip.ZipException: error in opening zip file at java.util.zip.ZipFile.open(Native Method)