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RAID system and galois field product computation method

A Galois field and product technology, applied in calculation, calculation using number system representation, calculation using non-contact manufacturing equipment, etc., can solve problems such as reducing performance

Active Publication Date: 2008-07-23
FUJITSU LTD
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  • Abstract
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Problems solved by technology

Therefore, reduced performance

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  • RAID system and galois field product computation method
  • RAID system and galois field product computation method
  • RAID system and galois field product computation method

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Embodiment Construction

[0044] Hereinafter, in the order of the RAID system, Galois field product calculation according to one embodiment, Galois field product calculation according to another embodiment, Galois field product calculation according to still another embodiment, and the modified embodiment, The present invention will be explained. However, the present invention is not limited to this configuration.

[0045] FIG. 1 is a block diagram illustrating a RAID system according to an embodiment of the present invention. Fig. 2 illustrates the parity calculation using the Galois field performed by the RAID system shown in Fig. 1. As shown in FIG. 1, the RAID system includes: a RAID controller 12 connected to a host computer 16, a plurality of (14 in this embodiment) data disk units (hard disk drives) 10-1 to 10-14, And the first parity disk unit (hard disk drive) 10-15 and the second parity disk unit (hard disk drive) 10-16, which are connected to the RAID controller 12 using, for example, a Fibre Ch...

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Abstract

Described is an apparatus for performing a Galois field product computation on data. A first symbol data includes a plurality of symbols each being a bit sequence on which a product operation by a factor alpha is to be performed in a Galois field, where alpha is a primitive element of the Galois field, is acquired. A factor alpha computation is performed on the first symbol data by performing a bit shift operation on the first symbol data toward high-order bit position, generating first mask data from the first symbol data, generating first correction data by computing a logical AND of the first mask data and a first symbol correction value, generating a factor alpha computation result by computing a XOR of the second symbol data and the first correction data.

Description

Technical field [0001] The present invention relates to a redundant array of independent disks (RAID) system for calculating data parity through Galois field calculation, and also relates to a Galois field product calculation method. More specifically, the present invention relates to a RAID system and a Galois domain product calculation method suitable for recovering data from a double-disk failure. Background technique [0002] One method used to recover data from a dual-disk failure is RAID-6. In this RAID-6 scheme, for example, as disclosed in Japanese Unexamined Patent Application Publication No. 2000-259359 (FIGS. 5 and 6), a linear redundancy technique has been proposed. [0003] Hereinafter, this technique will be described in the case of the configuration of the RAID-6 system shown in FIG. 14. Three data disk units (hard disk drives) 101, 102, and 103 and two parity disk units (hard disk drives) (ie, the first parity disk unit 104 and the second parity disk unit 105) are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/10
CPCH03M13/09G06F11/1076G06F2211/1057G06F7/52
Inventor 伊东利雄
Owner FUJITSU LTD
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