Abstract
The performance of the I/O subsystem is becoming more and more important in modern systems, since the CPU capacity increases rapidly. In this paper the IBM-370—XA I/O architecture is described from the point of view of a performance analyst, and suggestions are given to improve the system.
Two of the proposed systems, called the “buffered disk system” and the “local disk controller system”, are discussed in detail. At the expense of modifications to the hardware of the 370—XA I/O subsystem they provide a much better performance: the I/O access rate may easily be doubled or even tripled. Full compatibility with the 370XA channel subsystem, and with the MVS/XA operating system is maintained.
The performance improvements achievable with disk caching are investigated, both for the existing control unit based system, and for the proposed local disk controller system.
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Literature
A. Brandwajn, ‘Models of DASD Subsystems: Basic Model of Reconnection’, Performance Evaluation, Vol 1, November 1981, pp 263–281.
A. Brandwajn, ‘Models of DASD Subsystems with multiple Access Paths: A throughput Driven Approach’, IEEE transactions on Computers, vol C-32, May 1983, pp 451–463.
R.L. Cormier, R.J. Dugan and R.R. Guyette, ‘System/370 Extended Architecture: The Channel Subsystem’, IBM Journal of Research and Development, Vol 27, No 3, May 1983, pp 206–218.
G.E. Houtekamer, ‘A Local Disk Controller’, Delft University of Technology, report no 051560–28(1984)08.
IBM, ‘IBM System/370 Extended Architecture, Principles of Operation’, manual SA22–7085, 1983.
IBM, ‘IBM 3880 Storage Control Model 13 Description’, manual GA32–0067, 1983
H. Kobayashi, Modeling and Analysis: An introduction to System Performance Evaluation Methodology, Addison Wesley Publishing Company, Reading, Massachusetts, 1978, ISBN 0–201–14457–3.
S.S. Lavenberg, (ed.), Computer Performance Modeling Handbook, Academic Press, New York, 1963, ISBN 0–12–438720–9
A. Padegs, ‘System/370 Extended Architecture: Design Considerations’, IBM Journal of Research and Development, Vol 27, No 3, May 1983, pp 198–205.
A.J. Smith, ‘Optimization of I/O systems by Cache Disks and File Migration: A Summary’, Performance Evaluation, Vol 1, 1981, pp 249–262.
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© 1985 Springer-Verlag Berlin Heidelberg
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Houtekamer, G. (1985). Performance Analysis of the IBM DASD Subsystem, and Some Suggestions for Improved Systems. In: Beilner, H. (eds) Messung, Modellierung und Bewertung von Rechensystemen. Informatik—Fachberichte, vol 110. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-87472-7_19
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DOI: https://doi.org/10.1007/978-3-642-87472-7_19
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