HMC: A hybrid mirror-and-chained data replication method to supp

Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium

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369 48, 369 58, G11B 1722

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055597645

ABSTRACT:
A method of distributing a set of data among a plurality of disks, which provides for load balancing in the event of a disk failure. In accordance with the method the total number of the disks in an array are divided into a number of clusters. The blocks of data are then stored in each cluster such that each cluster contains a complete set of the data and such that data block placement in each cluster is a unique permutation of the data block placement in the other clusters. In the event of a disk failure, data block accesses to the failed disk are redirected to a disk in the other cluster having a copy of the data block and further access to the disks that remain operational are rebalanced.

REFERENCES:
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Hsiao et al. "Chained Declustering: A New Availability Strategy for Multiprocessor . . . " 6TH Int. Conf. on Data Engineering, Feb. 5, 1990, pp. 456-465.
Ghandeharizadeh et al. "Continuous Retrieval of Multimedia Data Using Parallelism" IEEE Trans. on Knowledge & Data Engineering, vol. 5, No. 4, Aug., 1993.
"Optimal Data Allotment to Build High Availability & High Performance Disk Arrays", IBM Technical Disclosure Bulletin, vol. 37, No. 5, May, 1994, pp. 75-79.
Keeton et al., "The Evaluation of Video Layout Strategies on a High-Bandwidth File Server" Proc. Network & Operating System Support for Digital Audio & Video, Nov. 3, 1993, pp. 228-239.
Li et al., "Combining Replication & Parity Approaches for Fault-Tolerant Disk Arrays", Proc. 6th IEEE Symposium on Parallel & Distributed Processing, Oct. 26, 1994, pp. 360-367.

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