Hello Thank you very much for your replies. I need only a small confirmation. That all means that: 1. Non persisted messages are stored in the same persistent storage like messages marked as persistent, when cache manager is out of memory 2. Messages marked as persistent can be both: in memory (cache) and persistent storage at the same time 3. When lack of electricity happens all non persistent messages from memory will be lost (stored non persistent ones will survive). Short answers like yes/no would be enought. Best regards vitor_b P.S. hard to be a beginner View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4030871#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...