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The scale of today's storage systems has made it increasingly difficult to find and manage files. To address this, we have developed Spyglass, a file metadata search system that is specially designed for large-scale storage systems. Using an optimized design, guided by an analysis of real-world metadata traces and a user study, Spy-glass allows fast,(More)
Real-time systems are growing in complexity and real-time and soft real-time applications are becoming common in general-purpose computing environments. Thus, there is a growing need for scheduling solutions that simultaneously support processes with a variety of different timeliness constraints. Toward this goal we have developed the Resource(More)
Deduplication technologies are increasingly being deployed to reduce cost and increase space-efficiency in corporate data centers. However, prior research has not applied deduplication techniques inline to the request path for latency sensitive, primary workloads. This is primarily due to the extra latency these techniques introduce. Inherently,(More)
To offset the significant power demands of hard disk drives in computer systems, drives are typically powered down during idle periods. This saves power, but accelerates duty cycle consumption, leading to earlier drive failure. Hybrid disks with a small amount of non-volatile flash memory (NVCache) are coming on the market. We present four I/O subsystem(More)
Being one of the few mechanical components in a typical computer system, hard drives consume a significant amount of the overall power used by a computer. Spinning down a hard drive reduces its power consumption, but only works when no disk accesses occur, limiting overall effectiveness. We have designed and implemented a technique to extend disk spin-down(More)
One of the biggest bottlenecks in desktop-based computing is the hard disk with I/O write latency being a key contributor. I/O write latency stems from the mechanical nature of hard disks, of which seek and rotational delays are the major components. Hybrid disk drives place a small amount of flash memory (NVCache) on the drive itself which can be leveraged(More)
Demand for real-time capability in general-purpose systems is rising and as systems are retrofitted with new scheduling features they become increasingly complex. To counter this trend we present the best-effort bandwidth server (BEBS), an aperiodic server for flexible and efficient support of best-effort applications in a real-time system. Recognizing that(More)
One of the goals of upcoming hybrid hard disks is to reduce power consumption by adding a small amount of non-volatile flash memory (NVCache) to the drive itself. By using the NVCache to satisfy writes while the rotating media is spun-down, hard disk power consumption can be decreased by lengthening low-power periods. However, the NVCache must eventually be(More)