โ Scribed by Pinheiro, Eduardo; Bianchini, Ricardo
No coin nor oath required. For personal study only.
In this paper, we study energy conservation techniques for disk array-based network servers. First, we introduce a new conservation technique, called Popular Data Concentration (PDC), that migrates frequently accessed data to a subset of the disks. The goal is to skew the load towards a few of the disks, so that others can be transitioned to low-power modes. Next, we introduce a user-level file server that takes advantage of PDC. In the context of this server, we compare PDC to the Massive Array of Idle Disks (MAID). Using a validated simulator, we evaluate these techniques for conventional and two-speed disks and a wide range of parameters. Our results for conventional disks show that PDC and MAID can only conserve energy when the load on the server is extremely low. When two-speed disks are used, both PDC and MAID can conserve significant energy with only a small fraction of delayed requests. Overall, we find that PDC achieves more consistent and robust energy savings than MAID.
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Sponsored By Acm Sigarch ; Additional Support By Intel Corporation And Florida State University. Acm Order Number 415031--t.p. Verso. Includes Bibliographical References And Author Index. Also Available On The World Wide Web Via Acm Digital Library With Title: Proceedings Of The 17th Annual Internat