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Storage Systems Research Center

A random write workload running with and without Ascar

Automatic Storage Contention Alleviation and Reduction system (Ascar) is a novel storage traffic management system for improving the bandwidth utilization and fairness of resource allocation. Ascar regulates I/O traffic from the clients using a rule based algorithm that controls the congestion window and request rates; it requires no runtime coordination between clients or with a central coordinator. Ascar produces rules in an unsupervised manner by systematically exploring the solution space of possible rule designs and evaluating the target workload under the candidate rule sets. Evaluation shows that our Ascar prototype can improve the throughput of all tested workloads – some by as much as 35%. The optimization time and controller overhead are unrelated to the scale of the system; thus, it has the potential to support millions of clients. As a pure client-side solution, Ascar needs no change to either the hardware or server software.

The Storage Systems Research Center is part of the Jack Baskin School of Engineering at the University of California, Santa Cruz. Composed of faculty from the Computer Science, Computer Engineering, and Electrical Engineering departments, our research focuses on many aspects of file and storage systems. We have active projects in archival storage, scalable distributed indexing and non-hierarchical file systems, large-scale distributed storage systems, file systems for next-generation storage devices, and data deduplication. We also have particular focus in cross-cutting issues such as security and reliability in file and storage systems. You're encouraged to browse a full list of our projects and explore the research that the SSRC has done since 2001.

If you're interested in joining the SSRC, please see this page or contact any of the faculty or students in the SSRC.

Prospective graduate students

Applications for graduate school at UC Santa Cruz are due at the end of each calendar year. We have lots of information available online for prospective graduate students.

Learn more about the SSRC

There are many ways to learn more about the SSRC and the research we're doing here at UC Santa Cruz.

  • Browse the SSRC web site
  • Subscribe to one or more RSS feeds (see the links in the upper left corner of the page)
  • Contact SSRC faculty, students, or staff
  • Attend an SSRC seminar or other event—all are open to the public unless otherwise indicated.
  • Browse past events from 2011, 2012, 2013, and 2014.
  • Visit the SSRC group on LinkedIn

Contact us

You can reach us by contacting individual faculty or students, or you can reach us at:

Storage Systems Research Center
Jack Baskin School of Engineering
University of California
1156 High Street
Santa Cruz, CA 95064  USA
Phone: +1 (831) 459-2817
Fax: +1 (831) 459-1041
Director: Prof. Darrell D. E. Long
Associate Director: Prof. Ethan L. Miller

Engineering 2 Building SSRC Labs:
E2-381: +1 (831) 459-4458
E2-383: +1 (831) 459-1371
E2-380: no phone


Last modified 9 Jan 2012
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