Parametric Evaluation of Performance Behavior in Hierarchical Storage Architecture
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Parametric Evaluation of Performance Behavior in Hierarchical Storage Architecture
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1997
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Abstract
In this article, we investigate lhe performance behavior of a hierarchical storage architecture. Considering
both the size of video files and the skewed file access patterns over the available files, it is not
cost-effective to store all video files on secondary storage such as disk arrays, since most users may
access only a small subset of the available video files. Using tertiary storage, such as a tape library, is a
promising solution for achieving the desired cost effectiveness. Though a hierarchical storage structure is
desirable, an unbalanced configuration of the storage hierarchy may result in waste of resources and thus
degrade overall server throughput. Our effort is focused on investigating the effect of the various system
parameters to obtain an optimal configuration of the hierarchical storage. Throughput of the server
is defined along with two orthogonal performance metrics, namely expected service rime and system
congestion and blocking probability. We establish an analytical formulation for the given performance
metrics. Hierarchical storage performance is governed by several factors such as user-access pattern,
number of tape drives, capacity of secondary storage, transfer rate of tape drives, and transfer rate of
disks. It is observed that speeding up the rate of data transfer may in some cases increase the blocking
probability and hence degrade overall server performance. We use a queuing model to obtain an analytical
formulation of the server's performance. This enables us to investigate the effects of different
configurations of the storage hierarchy and different data access patterns; it also provides a framework
to determine the optimal configuration of storage hierarchies. The results of a simulation-based performance
evaluation are also presented.
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Won, Youjip; Srivastava, Jaideep. (1997). Parametric Evaluation of Performance Behavior in Hierarchical Storage Architecture. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/215299.
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