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RAID-II: a high-bandwidth network file server

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11 Author(s)
A. L. Drapeau ; Div. of Comput. Sci., California Univ., Berkeley, CA, USA ; K. W. Shirriff ; J. H. Hartman ; E. L. Miller
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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. They designed their 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

Published in:

Computer Architecture, 1994., Proceedings the 21st Annual International Symposium on

Date of Conference:

18-21 Apr 1994