HMC: A hybrid mirror-and-chained data replication method to support high data availability for disk arrays
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United States of America Patent
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Sep 24, 1996
Grant Date -
N/A
app pub date -
Aug 18, 1994
filing date -
Aug 18, 1994
priority date (Note) -
Expired
status (Latency Note)
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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.
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