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IBM Journal of Research and Development  
Volume 48, Number 3/4, Page 519 (2004)
IBM eServer z990
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Reliability, availability, and serviceability (RAS) of the IBM eServer z990

by M. L. Fair, C. R. Conklin, S. B. Swaney, P. J. Meaney, W. J. Clarke, L. C. Alves, I. N. Modi, F. Freier, W. Fischer, N. E. Weber
The IBM eServer™ zSeries® Model z990 offers customers significant new opportunity for server growth while preserving and enhancing server availability. The z990 provides vertical growth capability by introducing the concurrent addition of processor/memory books and horizontal growth in channels by the use of extended virtualization technology. In order to continue to support the zSeries legacy for high availability and continuous reliable operation, the z990 delivers significant new features for reliability, availability, and serviceability (RAS). This paper describes these new capabilities, in each case presenting the value of the feature, both in terms of enhancing the self-management capability of the server and its availability.
Related Subjects: Computer architecture; Computer organization and design; Computer system availability; IBM eServer z990