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...{s|0≤s≤S}{K(n, s)} 5 Evaluation Methodology 5.1 Test Bed We simulate a complete storage system to evaluate our power-aware cache management schemes. We have enhanced the widely used DiskSim simulator =-=[12]-=- and augmented it with a disk power model. The power model we use is similar to that used by Gurumurthi et al. [16] for multi-speed disks. We have also developed a storage cache simulator, CacheSim an...

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...hanical model handles seek times, rotational latency and various other aspects of disk mechanics. The implementations of these modules in the current version of Diskmodel are derived from DiskSim 2.0 =-=[4]-=-. Disksim 3.0 uses Diskmodel natively. Diskmodel has also been used in a device driver implementation of a shortest positioning time first disk request scheduler. B.2 Types and Units All math in diskm...

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...W 10.9 secs 135 J 1.5 secs 13 J Table 1: Simulation Parameters We simulate a complete storage system to evaluate our poweraware cache management schemes. We enhanced the widely used DiskSim simulator =-=[11]-=- by adding a disk power model. The power model used is similar to that proposed by Gurumurthi et al. [15] for multi-speed disks. We also developed a storage cache simulator, CacheSim and use it with D...

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...PC-H 4,228,725 15 35.96 7200 6 Table 2: Workloads and the configuration of the original storage systems on which the traces were collected. Our experiments are carried out using the Disksim simulator =-=[12]-=-, which models the performance of disks, caches, storage interconnects, and multi-disk organizations in detail, and has been validated against several real disk drives. We augmented Disksim with power...

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...ple, accessing partial sectors is not supported in disk drives but MEMS storage devices may be able to conserve power by using small transfers for metadata and other small requests. Using the DiskSim =-=[4]-=- MEMS simulator, we investigated the interaction between power consumption and I/O performance based on file system traces [18]. Our experimental results show that the power consumption pattern of MEM...

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...ns to compare the throughput of different disk layouts. Our simulator consists of a disk component, a disk layout component, and a buffer pool component. We ported the disk component from DiskSim 2.0 =-=[5]-=-. The disk layout component simulates disk layouts for Overwrite, LFS, WOLF, and HyLog. The implementation of LFS is based on the description in [14, 19] and the source code of the Sprite operating sy...

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...tion of REO, we have attempted to quantify the benefits of the Optimizer within the RAID Engine. For this we built a simulation model that included memory and I/O buses and integrated it into disksim =-=[13]-=-, a disk simulator with fairly accurate disk and array models. We simulated the setup shown in Figure 1. 8.2.1 Setup Table 2 lists the fixed parameters for our experiment and their values. We chose pa...

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...mmler and Wilkes [14] developed an accurate disk drive model, which has since been used to study disk seek algorithms. DiskSim is another storage simulator that has been used to model system behavior =-=[2]-=-, and has been adapted to include MEMS devices. Recently, there has been interest in modeling the behavior of MEMS storage devices. Griffin, Schlosser, Ganger, and Nagle have published extensively on ...