Setting CSALIMITs as an early warning is different. Rather than measuring the CSA usage of some other application, you measure DFSMShsm’s CSA use. This method uses DFSMShsm CSALIMITS as an alarm system that notifies the console operator if DFSMShsm’s CSA usage deviates from normal.

1. Run the system for a week or two with CSALIMIT inactive or set to a very high value.
2. Issue the QUERY CSALIMIT command periodically to determine DFSMShsm’s CSA use.
3. Identify peak periods of CSA use.
4. Select a maximum value based on the peak, multiplied by a safety margin that is within the constraints of normally available CSA.