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RAID controller

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Promise Technology Ultra33 IDE RAID controller

A RAID controller is a device which manages the physical storage units in a RAID system and presents them to the computer as logical units. The term is typcially used to refer to a host bus adapter (HBA), but it may also refer to the controller unit of an independent enclosure, such as a disk array or network-attached storage (NAS) server.

External disk arrays are usually purchased as an integrated subsystem of RAID controllers, disk drives, power supplies, and management software. RAID adapters for use internal to a PC or server are sold either as embedded systems in the computer or as seperate expansion cards.

RAID controllers typically use one of the following buses/protocols to communicate with the physical disks:

The logical drives are generally presented to the operating system as an SCSI disk drive using a vendor specific device driver interface.

References

  • Storage Basics: Choosing a RAID Controller, May 7, 2004, By Ben Freeman[1]
  • ORACLE FAQ Glossary of Terms, Nov 12, 2005, Frank Naudé

http://www.orafaq.com/glossary/faqglosr.htm


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