Different Forms of RAID

Computer Science & Engineering

RAID stands for Redundant Array For Independent Disk is a method which groups several disks together which makes the system to view as a single disk.RAID uses three techniques namely Stripping,Mirroring and Parity. stripping is the process of splitting the data and writing the data across the disks.In mirroring two identical copies of data are created if any disk fails,data can be read from the duplicated disk.Parity is used to recalculate the data when disk failure happens.In this paper different RAID lelves are discussed.RAID 0 uses Stripping technique which is not fault tolerant,RAID 1 uses Mirroing technique which provides excellent data protection.RAID 3 AND RAID 5 both uses stripping and parity and can withstand single disk failure where as RAID 6 uses stripping with dual parity and can withstand two disks failure.Nested levels namely RAID 0+1 AND RAID 1+0 combines the ideas of both RAID 0 AND RAID 1.In these nested levels the RAID 0 performance benefits and the RAID 1fault tolerance benefits are combined.

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