![]() ![]() Those external disk arrays are usually purchased as an integrated subsystem of RAID controllers, disk drives, power supplies, and management software. In a modern enterprise architecture disk array controllers (sometimes also called storage processors, or SPs ) are parts of physically independent enclosures, such as disk arrays placed in a storage area network (SAN) or network-attached storage (NAS) servers. Many enterprise controllers use FC on front-end and SATA on back-end. somewhat less popular protocol dedicated for a specific solution: FICON/ ESCON, iSCSI, HyperSCSI, ATA over Ethernet or InfiniBandĪ single controller may use different protocols for back-end and for front-end communication. ![]() one of ATA, SATA, SCSI, FC these are popular protocols used by disks, so by using one of them a controller may transparently emulate a disk for a computer.Front-end interface communicates with a computer's host adapter (HBA, Host Bus Adapter) and uses:.Back-end interface communicates with controlled disks. ![]() The two should not be confused as they provide very different functionality.Ī disk array controller provides front-end interfaces and back-end interfaces. It also often provides additional disk cache.ĭisk array controller is often improperly shortened to disk controller. It almost always implements hardware RAID, thus it is sometimes referred to as RAID controller. A disk array controller is a device that manages the physical disk drives and presents them to the computer as logical units. ![]()
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