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RAID Controllers
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. more...
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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:
IDE;
SCSI;
SATA;
SAS;
Fibre Channel;
The logical drives are generally presented to the operating system as an SCSI disk drive using a vendor specific device driver interface.
Read more at Wikipedia.org
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