Check out the new USENIX Web site.

Home About USENIX Events Membership Publications Students
OSDI 2000 Abstract

Trading Capacity for Performance in a Disk Array1

Xiang Yu, Benjamin Gum, Yuqun Chen, Randolph Y. Wang, and Kai Li, Princeton University; Arvind Krishnamurthy, Yale University; and Thomas E. Anderson, University of Washington


A variety of performance-enhancing techniques, such as striping, mirroring, and rotational data replication, exist in the disk array literature. Given a fixed budget of disks, one must intelligently choose what combination of these techniques to employ. In this paper, we present a way of designing disk arrays that can flexibly and systematically reduce seek and rotational delay in a balanced manner. We give analytical models that can guide an array designer towards optimal configurations by considering both disk and workload characteristics. We have implemented a prototype disk array that incorporates the configuration models. In the process, we have also developed a robust disk head position prediction mechanism without any hardware support. The resulting prototype demonstrates the effectiveness of the configuration models.
?Need help? Use our Contacts page.

Last changed: 16 Jan. 2002 ml
Technical Program
OSDI 2000 Home