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Analytical performance modeling of hierarchical mass storage systems

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4 Author(s)
Pentakalos, O.I. ; Maryland Univ., Baltimore, MD, USA ; Menasce, D. ; Halem, M. ; Yesha, Y.

Mass storage systems are finding greater use in scientific computing research environments for retrieving and archiving the large volumes of data generated and manipulated by scientific computations. This paper presents a queuing network model that can be used to carry out capacity planning studies of hierarchical mass storage systems. Measurements taken on a Unitree mass storage system and a detailed workload characterization provided the workload intensity and resource demand parameters for the various types of read and write requests. The performance model developed here is based on approximations to multiclass Mean Value Analysis of queuing networks. The approximations were validated through the use of discrete event simulation and the complete model was validated and calibrated through measurements. The resulting model was used to analyze three different scenarios: effect of workload intensity increase, use of file compression at the server and client, and use of file abstractions

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Computers, IEEE Transactions on  (Volume:46 ,  Issue: 10 )