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Concurrent driver upgrade: Method to eliminate scheduled system outages for new function releases

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5 Author(s)
A. Muehlbach ; IBM Systems and Technology Group, IBM Deutschland Entwicklung GmbH, Schoenaicherstrasse 220, 71032 Boeblingen, Germany ; B. D. Valentine ; D. Immel ; M. S. Bomar
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The reliability, availability, and serviceability goal for an IBM zSeries® system is to provide 24-hour-per-day, 365-day-per-year service with reduced system downtime. The continuous reliable operation rate has been improved with every new zSeries release by using error prevention, error detection, error recovery, and other methods that contribute to avoiding unplanned interruptions. Until now, planned downtime—for example, the time needed to upgrade a zSeries to the next firmware driver—had not yet been addressed. We developed the concurrent driver upgrade (CDU) feature so that customers could add new functions without downtime. It is now possible to upgrade the zSeries firmware engineering change (EC) driver to the next EC level without any performance impact during the upgrade. This paper describes the motivation and strategy of the CDU and describes its use.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:51 ,  Issue: 1.2 )