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Fault-tolerance design of the IBM Enterprise System/9000 Type 9021 processors

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5 Author(s)
Chen, C.L. ; IBM Enterpise Systems, P.O. Box 950, Poughkeepsie, New York 12602, USA ; Tendolkar, N.N. ; Sutton, A.J. ; Hsiao, M.Y.
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The 9021-type processors offer the highest performance of the IBM Enterprise System/9000™ (ES/9000™) series. They also have the highest levels of concurrent error detection, fault isolation, recovery, and availability of any IBM general-purpose processor. High availability is achieved by minimizing component failure rates through improvements of the base technology, and design techniques that permit hard and soft failure detection, recovery and isolation, and component replacement concurrent with system operation. In this paper, we discuss fault-tolerant design techniques for array, logic, and storage subsystems. We also present diagnostic strategy, fault isolation, and recovery techniques. New features such as the redundant power system and Processor Availability Facility are described. The overall recovery design is described, as well as specific implementation schemes. The design process to verify the error detection, fault isolation, and recovery is also described.

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:36 ,  Issue: 4 )