RAID controller
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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 sometimes used to refer to a host bus adapter (HBA), but it properly refers to the hardware which implements the RAID logic. This controller may be integrated with an HBA, or it may be part 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 separate 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.
[edit] 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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