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RAID processing unit
A Raid Processing Unit is an Integrated Circuit designed to implement RAID for persistent storage devices. The RPU performs calculations, such as XOR, to maintain data integrity over all connected drives in an array.
RAID calculations can be performed by the computer's central processing unit (CPU), but using a separate specialized chip for this task can save much array built time and increases overall usage performance.
RPU's are used mainly on specialized RAID adapters. Such a RAID adapter acts as an intermediary between the array of inexpensive drives and the computers' main data interface (such as PCI, ISA or PCI-Express)
Most RAID adapter use a general purpose Integrated Circuit to perform array built calculations and RAID calculations. Those integrated circuits usually have (a) good performing XOR unit(s). XOR calculations are used to compute data blocks on more advanced RAID levels like RAID 5 and RAID 6 when writing data to the persistent storage devices.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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