The IXLALTER function provides for the expansion or contraction of the size of a structure and/or for the reapportionment of the entry-to-element ratio of the structure. When the system receives an IXLALTER request for a cache structure, all active reclaim vectors associated with all storage classes for the structure are deactivated. The system resumes using the default reclaim algorithm for all storage classes for the structure.

While the alter process continues, the system rejects any attempt to activate a reclaim vector with non-zero return and reason codes.

At the completion of structure alter processing, you can again activate one or more reclaim vectors. Ensure that when doing so, you take into consideration any changes that were made to the structure's entry and element counts during the alter process. Also, be aware that any reclaim vectors that were deactivated when the structure alter process was initiated are not automatically reinstated at the completion of alter processing.