An address space that becomes nonreusable when it terminates (that is, message IEF352I ADDRESS SPACE UNAVAILABLE is issued when the address space terminates) should be considered for using a reusable ASIDs. Specify REUSASID=YES on the START command for the address spaces or specify ATTR=(REUSASID) on the ASCRE. Investigate and remediate any 0D3 abends that result from the use of a reusable ASID.

For an address spaces that does not become nonreusable when it terminates (that is, no IEF352I message), you should not specify REUSASID=YES on the START command or ATTR=(REUSASID) on ASCRE. z/OS® takes an ASID from the pool of available ordinary ASIDs to satisfy a request for reusable ASID if there are no available ASIDs that have been previously used as a reusable ASID. Once an ASID has been used to satisfy a request for a reusable ASID, it can only be used as a reusable ASID (that is, it cannot be used for a START without REUSASID=YES or an ASCRE without ATTR=(REUSASID)). Unnecessary use of REUSASID=YES or ATTR=(REUSASID) can reduce the number of ordinary ASIDs available for satisfying ordinary address space requests.