If you have Toolkit running, MONDAT is the command to see what data is collected and how much of each. You don't have to have MONWRITE running to use the Performance Toolkit. If you want to keep raw MONWRITE data around, various reasons were discussed recently on the list, you'll need to first estimate the space you need for this and then also create a process to clean up the disk full condition. The current MONWRITE does not automatically clean up after itself.
Bill Bitner - VM Performance Evaluation - IBM Endicott - 607-429-3286
