Intel Research Seminar

DATE: Thursday , February 7, 2002
TIME: Noon - 1:30 pm
PLACE: Intel Seminar (417 S. Craig Street - 3rd Floor)

David Stewart
Ph.D. Student, Cambridge University

Quality of Service for Storage Devices

Currently storage devices provide unpredictable levels of service due to variable load and throughput optimizing scheduling policies. Storage device speeds are improving much less rapidly than that of other computer system components, so their performance is becoming increasingly visible to users. Thus the variable service of storage devices will cause greater and greater irritation.

This talk addresses the problems of providing predictable and timely service from storage devices, particularly in scenarios where there is a high level of contention for storage system bandwidth --- file and database servers. The workloads that these systems service also have a large amount of dependency between individual requests; timeliness problems cannot be solved through judicious pre-fetching and caching, unlike multimedia workloads where these techniques perform admirably.

A model of timeliness requirements for storage system traffic is presented, as is an architecture for fulfilling such requirements with low administrative, user and computational overhead.

Dave Stewart is a PhD student at Cambridge University's Computer Laboratory and has recently submitted his dissertation entitled "Quality of Service from Storage Devices." This is the subject of a paper being submitted to iwQoS this year.

For Further Seminar Info:
Contact Kim Kaan, 412-605-1203, or visit

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