Storage apparatus and data integrity assurance method

Details Storage apparatus and data integrity assurance method Storage apparatus and data integrity assurance method

2009-02-19

2011-10-18

Kindred, Alford W (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S002000, C710S052000, C710S065000

Reexamination Certificate

active

08041850

ABSTRACT:
A channel control unit of a storage apparatus is provided with: a variable-length DMA (Direct Memory Access) that performs data transfer of variable-length data sent to or received from the host computer in accordance with an I/O request; a fixed-length DMA that performs data transfer of fixed-length data to and from the cache memory; and a buffer intervening between the variable-length DMA and the fixed-length DMA. In performing the data transfer of the fixed-length data to the cache memory, the fixed-length DMA divides the variable-length data into multiple sets of the fixed-length data each having a data size equivalent to a unit size of data managed in the cache memory, and adds a first integrity code to the last fixed-length data set of the fixed-length data sets generated by the division, the first integrity code being generated based on the entire variable-length data.

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International Search Report of PCT/JP2009/000714 mailed Nov. 27, 2009.

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