Redundant Arrays of Independent Disks


Redundant Arrays of Independent Disks

(storage, architecture)(RAID. Originally "Redundant Arraysof Inexpensive Disks") A project at the computer sciencedepartment of the University of California at Berkeley,under the direction of Professor Katz, in conjunction withProfessor John Ousterhout and Professor David Patterson.

The project is reaching its culmination with theimplementation of a prototype disk array file server with acapacity of 40 GBytes and a sustained bandwidth of 80MBytes/second. The server is being interfaced to a 1 Gb/slocal area network. A new initiative, which is part of theSequoia 2000 Project, seeks to construct a geographicallydistributed storage system spanning disk arrays and automatedlibraries of optical disks and tapes. The project willextend the interleaved storage techniques so successfullyapplied to disks to tertiary storage devices. A key elementof the research will be to develop techniques for managinglatency in the I/O and network paths.

The original ("..Inexpensive..") term referred to the 3.5 and5.25 inch disks used for the first RAID system but no longerapplies.

The following standard RAID specifications exist:

RAID 0 Non-redundant striped arrayRAID 1 Mirrored arraysRAID 2 Parallel array with ECCRAID 3 Parallel array with parityRAID 4 Striped array with parityRAID 5 Striped array with rotating parity

ftp://wuarchive.wustl.edu/doc/techreports/berkeley.edu/raid/raidPapers.http://HTTP.CS.Berkeley.EDU/projects/parallel/research_summaries/14-Computer-Architecture/.

["A Case for Redundant Arrays of Inexpensive Disks (RAID)","D. A. Patterson and G. Gibson and R. H. Katz", Proc ACMSIGMOD Conf, Chicago, IL, Jun 1988].

["Introduction to Redundant Arrays of Inexpensive Disks(RAID)", "D. A. Patterson and P. Chen and G. Gibson andR. H. Katz", IEEE COMPCON 89, San Francisco, Feb-Mar 1989].