Autoinstall performance

You might want to increase the number of buffers to improve autoinstall performance. Increasing the number of buffers can stop the high-level index being read for each autoinstall.

If you have many terminals autoinstalled, shutdown can fail due to the value of the MXT system initialization parameter being reached or CICS® becoming short on storage. To prevent this possible cause of shutdown failure, consider putting the CATD transaction in a class of its own to limit the number of concurrent CATD transactions. Also, the AIQMAX parameter can be specified to limit the number of devices that can be queued for autoinstall. This parameter protects against abnormal consumption of virtual storage by the autoinstall or delete process, caused as a result of some other abnormal event.

If the CATD transaction limit is reached, the AIQMAX system initialization parameter affects the LOGON, LOGOFF, and BIND processing by CICS. CICS requests the z/OS® Communications Server to stop passing such requests to CICS. The z/OS Communications Server holds the requests until CICS indicates that it can accept further commands.

This occurs when CICS has processed a queued autoinstall request.