RAID-II: A high-bandwidth network file server

Ann L. Drapeau, Ken W. Shirriff, John H. Hartman, Ethan L. Miller, Srinivasan Seshan, Randy H. Katz, Ken Lutz, David A. Patterson, Edward K. Lee, Peter M. Chen, Garth A. Gibson

Research output: Contribution to journalConference articlepeer-review

28 Scopus citations


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-II, 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.

Original languageEnglish (US)
Pages (from-to)234-244
Number of pages11
JournalConference Proceedings - Annual International Symposium on Computer Architecture, ISCA
StatePublished - 1994
EventProceedings of the 21st Annual International Symposium on Computer Architecture - Chicago, IL, USA
Duration: Apr 18 1994Apr 21 1994

ASJC Scopus subject areas

  • Hardware and Architecture


Dive into the research topics of 'RAID-II: A high-bandwidth network file server'. Together they form a unique fingerprint.

Cite this