RAID-II: a high-bandwidth network file server

  • Authors:

  • A. L. Drapeau;K. W. Shirriff;J. H. Hartman;E. L. Miller;S. Seshan;R. H. Katz;K. Lutz;D. A. Patterson;E. K. Lee;P. M. Chen;G. A. Gibson

  • Affiliations:

  • Computer Science Division, University of California, Berkeley, CA;Computer Science Division, University of California, Berkeley, CA;Computer Science Division, University of California, Berkeley, CA;Computer Science Division, University of California, Berkeley, CA;Computer Science Division, University of California, Berkeley, CA;Computer Science Division, University of California, Berkeley, CA;Computer Science Division, University of California, Berkeley, CA;Computer Science Division, University of California, Berkeley, CA;DEC Systems Research Center, Palo Alto, CA;Computer Science and Engineering Division, University of Michigan, Ann Arbor, MI;School of Computer Science, Carnegie Mellon Umversity, Pittsburgh, PA

  • Venue:
  • ISCA '94 Proceedings of the 21st annual international symposium on Computer architecture
  • Year:
  • 1994

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Abstract

In 1989, the RAID (Redundant Arrays of Inexpensive Disks) group at U. C. Berkeley built a prototype disk array called RAID-I. The bandwidth delivered to clients by RAID-I was severely limited by the memory system bandwidth of the disk array' s host workstation. We designed our second prototype, RAID-H, to deliver more of the disk array bandwidth to file server clients. A custom-built crossbar memory system called the XBUS board connects the disks directly to the high-speed network, allowing data for large requests to bypass the server workstation. RAID-II runs Log-Structured File System (LFS) software to optimize performance for bandwidth-intensive applications.The RAID-II hardware with a single XBUS controller board delivers 20 megabytes/second for large, random read operations and up to 31 megabytes/second for sequential read operations. A preliminary implementation of LFS on RAID-II delivers 21 megabytes/second on large read requests and 15 megabytes/second on large write operations.