D-SPTF: Decentralized Request Distribution in
Brick-based Storage Systems
Christopher R. Lumb, Gregory R. Ganger, Richard Golding*
November 2003
CMU-CS-03-202
School of Computer Science
Carnegie Mellon University
Pittsburgh, PA 15213-3890
*IBM Almaden Research
Abstract
Distributed Shortest-Positioning Time First (D-SPTF) is a request distribution protocol for decentralized
systems of storage servers. D-SPTF exploits high-speed interconnects to dynamically select which server, among
those with a replica, should service each read request. In doing so, it simultaneously balances load, exploits the
aggregate cache capacity, and reduces positioning times for cache misses. For network latencies of up to 0.5ms, DSPTF performs as well as would a hypothetical centralized system with the same collection of CPU, cache, and disk
resources. Compared to existing decentralized approaches, such as hash-based request distribution, D-SPTF
achieves up to 65% higher throughput and adapts more cleanly to heterogeneous server capabilities.
We thank the members and companies of the PDL Consortium (including EMC, Hewlett-Packard, Hitachi, IBM, Intel,
Microsoft, Network Appliance, Oracle, Panasas, Seagate, Sun and Veritas) for their interest, insights, feedback and support. This
work is partially funded by the National Science Foundation, via grant #CCR-0205544.
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