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IBM System z10 design for RAS

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8 Author(s)
W. J. Clarke ; IBM Systems and Technology Group, 2455 South Road, Poughkeepsie, New York 12601, USA ; L. C. Alves ; T. J. Dell ; H. Elfering
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The IBM System z10™ server reliability, availability, and serviceability (RAS) design continues to reduce the sources of server outages through innovative RAS architecture and techniques. The z10™ server introduced functional improvements that challenged the RAS design. Increases were made in the performance of each processor, the total number of processors, the total size of the memory, the amount of cache, the bandwidth of the I/O, the thermal density, and the exposure to soft errors. These changes demanded stronger RAS functions to prevent unscheduled outages. Significant improvements were made to the IBM e-business on demand® functions (concurrent, customer-requested upgrades) that enable customers to better manage capacity without having to take planned outages. The hypervisor simplified configuration changes, such as adding cryptography or channel subsystems to logical partitions, by eliminating the need for preplanning. Single-core checkstopping and single transparent CPU (central processing unit) sparing were added. The RAS functions reduced the number of scheduled outages. Product improvements were complemented by improvements in RAS modeling. This paper describes these RAS improvements and how they provide value to the customer.

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:53 ,  Issue: 1 )