Advanced Topics › TPCF Device Processing

TPCF Device Processing

It is not always apparent why one device is chosen over another device during allocation processing. You may find that a device you would rather not use is being used before a more preferred device in spite of the criteria you have defined to TPCF. If this is the case at your site, then you should read this section to find out more about TPCF device processing and how z/OS allocation processing may reduce the effectiveness of TPCF under certain circumstances. Also read this section if jobs are entering allocation recovery unexpectedly.

This section provides you with detailed information about the following topics:

• Factors that influence or limit the ability of TPCF to preference devices
• Why jobs enter allocation recovery when online devices are available
• What you can do to prevent jobs from entering allocation recovery
• What you can do if TPCF elimination or preferencing are not producing the results you expect