Predictive Reduction of Power and Latency (PuRPLe)

Increasing efforts have been aimed towards the management of power as a critical system resource, and the disk can consume approximately a third of the power required for a typical laptop computer. Mechanisms to manage disk power have included spin-down policies and APIs to modify access workloads to be more powerfriendly. In this work we present a measurement study of disk power consumption, focusing on the potential impact of successfully optimizing disk layout or predicting future disk accesses with predictive read-ahead. We demonstrate how such strategies can allow the reduction of disk power consumption at least as well as traditional disk spin-down schemes, while avoiding the serious performance degradation that can occur from excessive spin-downs. Experimental results showed that a successful predictive disk management policy could reduce disk power consumption by over 80%, while maintaining the responsiveness of a continuously running disk. In contrast, an aggressive spin-down...

• Type: Conference
• Year: 2005
• Where: MSS
• Authors: Matthew Craven, Ahmed Amer
• Keywords: Disk Power, Disk Power Consumption, Future Disk Accesses, MSS 2005