NDLI: Modeling recycle: a case study in the industrial use of measurement and modeling

Content Provider	IEEE Xplore Digital Library
Author	Malhis, L.M. West, S.C. Kant, L.A. Sanders, W.H.
Copyright Year	1995
Description	Author affiliation: Storage Syst. Div., IBM Corp., Tucson, AZ, USA (Malhis, L.M.; West, S.C.)
Abstract	Large-scale data storage systems rely on magnetic tape cartridges to store millions of data objects. As these tapes age, the resident data objects become invalid; consequently, less and less of the tape potential capacity is effectively utilized. To address this problem, data storage systems have a facility, called "recycle" in this paper, that transfers valid data objects from sparsely populated tapes onto new tapes, thus creating empty tapes for reuse. A high performance recycle process is needed to keep the number of tape cartridges to a minimum, and to maintain a continuous supply of empty tapes for storing newly created data objects. The performance of such processes is not easy to determine, and depends strongly on the data stored on the tapes, the speed and characteristics of the computer on which recycle is executed, and the nature of the algorithms themselves. This paper documents an extensive effort to evaluate a proposed recycle algorithm, using held workload data, laboratory measurements, and modeling. The results of the study were used to improve the recycle process, and were later verified through field trials. In addition yielding the results themselves, the effort illustrated that modeling and measurement, in an industrial setting, can indeed be used successfully in the design process.<>
Starting Page	285
Ending Page	294
File Size	1084294
Page Count	10
File Format	PDF
ISBN	0818670592
DOI	10.1109/IPDS.1995.395823
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-04-24
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Recycling Computer aided software engineering Large-scale systems Data storage systems Laboratories Magnetic field measurement Process design Coordinate measuring machines Electric variables measurement Area measurement
Content Type	Text
Resource Type	Article

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