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US 2010/0162088 A1Published application
Xor circuit, raid device capable of recovering a plurality of failures and method thereof
AssigneeAccusys, Inc.
InventorsWen-Sen Tsai, Hung-Chi Lin, Feng-Sheng Chu
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Abstract
An XOR circuit, a RAID device which can recover several failures and method thereof are provided. A Galois field data recovery circuit having two or more sets of Galois Field engine circuits which are used in the XOR circuit, is one which can generate high efficient parity engine and high efficient flow data route and which at the same time correct the three or more failures during operation of the RAID device.
Claims10
A method of accessing data on a RAID device capable of recovering a plurality of failures comprising steps of:
- (1) issuing an access request from an host device to a RAID controller;
- (2) if the access request is write, then
- (2a) copying new data into a local memory from the host device;
- (2b) writing the new data into a plurality of disk drives;
- (2c) obtaining the new data on an internal bus from the internal bus;
- (2d) generating a new parity by an XOR circuit and storing in an XOR buffer;
- (2e) storing the new parity into the local memory;
- (2f) writing the new parity into a plurality of disk drives;
- (3) if the access request is read, then
- (3a) copying old data and old parities into the local memory from the disk drives;
- (3b) obtaining the new data on the internal bus from the internal bus;
- (3c) recovering lost data and storing recovered data into the XOR buffer;
- (3d) storing the recovered data into the local memory;
- and
- (3e) getting the old data and the recovered data from the local memory.
12 more elements
Dependencies are inferred from the claim text.