Parity block configuration in an array of storage devices
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United States of America Patent
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Jul 16, 1996
Grant Date -
N/A
app pub date -
Mar 14, 1994
filing date -
Mar 14, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a redundant array of disk storage units which independently accesses data blocks on different units and which uses parity blocks for data protection, parity blocks are confined to specific address ranges of each respective disk unit (rows of the array), each row containing multiple parity blocks. Each parity block represents the exclusive-OR of a stripe of data blocks located on a diagonal of the array. Where data accesses exhibit locality of reference in certain rows, this arrangement distributes the burden of updating parity more equally than a conventional RAID level 5. Additionally, because a 'row' corresponds to a particular annular region of a disk surface on each respective disk unit, parity blocks can be located at optimal logical addresses or physical regions of the disk surface to simplify address translation and/or further improve performance.
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