HP Labs Technical Reports



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Ivy: a study on replicating data for performance improvement

Lo, Sai-Lai

HPL-CSP-90-48

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Abstract: Keeping multiple copies of a file may improve read performance by increasing the bandwidth through parallel access; by balancing the load across storage nodes and by choosing the one which gives the fastest response. However, keeping all the copies up-to-date could incur a significant overhead. One possible approach to achieve good read performance and avoid slow updates is to change the number of copies according to the usage pattern. The aim of the Ivy project was to assess the potential of this dynamic replication scheme in achieving better read performance. A series of trace-driven simulations were performed. The results of this study indicate that read performance improvement of over twenty percent can be achieved with dynamic replications.

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