Redundant array of independent disks level 5 (raid 5) with a mirroring functionality
AssigneeLSI Corporation
InventorsRanjan Kumar, Preeti Badampudi, Shivprasad Prajapati
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Abstract
A redundant array of independent disks level 5 (RAID 5) with a mirroring functionality is disclosed. In one embodiment, a method for adding a mirroring functionality to a RAID 5 includes forming an array using at least three drives for storing data, creating multiple data blocks and a parity for the multiple data blocks based on the data for every (2N-1)th stripe of the array, and generating a mirror image of the multiple data blocks and the parity for the multiple data blocks for every (2N-1)th stripe to its respective 2Nth stripe of the array, where the N is an integer starting from 1.
Claims20
A method for adding a mirroring functionality to a RAID 5, comprising:
- forming an array using at least three drives for storing data;
- creating a plurality of data blocks and a parity for the plurality of data blocks based on the data for every (2N−1)th stripe of the array;
- and
- generating a mirror image of the plurality of data blocks and the parity for the plurality of data blocks for every (2N−1)th stripe to its respective 2Nth stripe of the array, wherein the N comprises an integer starting from 1.
A computer readable medium for adding a mirroring functionality to a RAID 5 having instructions that, when executed by a computer, cause the computer to perform a method comprising:
- forming an array using at least three drives for storing data;
- creating a plurality of data blocks and a parity for the plurality of data blocks based on the data for every (2N−1)th stripe of the array;
- and
- generating a mirror image of the plurality of data blocks and the parity for the plurality of data blocks for every (2N−1)th stripe to its respective 2Nth stripe of the array, wherein the N comprises an integer starting from 1.
A RAID controller coupled to a host central processing unit (CPU) for adding a mirroring functionality to a RAID 5 by performing a method comprising:
- forming an array using at least three drives for storing data;
- creating a plurality of data blocks and a parity for the plurality of data blocks based on the data for every (2N−1)th stripe of the array;
- and
- generating a mirror image of the plurality of data blocks and the parity for the plurality of data blocks for every (2N−1)th stripe to its respective 2Nth stripe of the array, wherein the N comprises an integer starting from 1.
Dependencies are inferred from the claim text.