Determine if the shortage is due to RSVNONR being specified too low or an application problem that is causing a large number of address spaces to become non-reusable.

Examine the ASVTNONR and ASVTANR field (representing the total and currently available RSVNONR entries) to determine the depletion rate of RSVNONR entries. To calculate and verify the average ASID depletion rate, the ASVTANR value should be collected multiple times over a period of several weeks before this message is issued. When you know the historical average depletion rate and the expected interval between IPLs, the result +5% is the minimum RSVNONR value that should be specified at IPL. For details about ASVT, see z/OS® MVS™ Data Areas in the z/OS Internet library.

If the depletion rate unexpectedly exceeds the average rate and causes this message to be displayed, an application problem may exist. The cause of the change in the depletion rate should be determined.

For more information about RSVNONR, see z/OS MVS Initialization and Tuning Reference.