Redundant Arrays of Independent Disks
RAID
Redundant Array of Inexpensive Disks
Redundant Arrays of Inexpensive Disks

    (RAID.  Originally "Redundant Arrays
   of Inexpensive Disks") A project at the computer science
   department of the University of California at Berkeley,
   under the direction of Professor Katz, in conjunction with
   Professor John Ousterhout and Professor David Patterson.

   The project is reaching its culmination with the
   implementation of a prototype disk array file server with a
   capacity of 40 GBytes and a sustained bandwidth of 80
   MBytes/second.  The server is being interfaced to a 1 Gb/s
   local area network.  A new initiative, which is part of the
   Sequoia 2000 Project, seeks to construct a geographically
   distributed storage system spanning disk arrays and automated
   libraries of optical disks and tapes.  The project will
   extend the interleaved storage techniques so successfully
   applied to disks to tertiary storage devices.  A key element
   of the research will be to develop techniques for managing
   latency in the I/O and network paths.

   The original ("..Inexpensive..") term referred to the 3.5 and
   5.25 inch disks used for the first RAID system but no longer
   applies.

   The following standard RAID specifications exist:

    RAID 0	Non-redundant striped array
    RAID 1	Mirrored arrays
    RAID 2	Parallel array with ECC
    RAID 3	Parallel array with parity
    RAID 4	Striped array with parity
    RAID 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 ACM
   SIGMOD Conf, Chicago, IL, Jun 1988].

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

   (1995-07-20)