Method and system for updating data in a data storage system
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United States of America Patent
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-
Dec 25, 2001
Grant Date -
N/A
app pub date -
Feb 19, 1999
filing date -
Feb 19, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and system for a data storage system to update stored data with received data in a cache associated with the data storage system where the data storage system comprises N data storage drives is provided, where data and calculated parity are striped across the N data storage drives. An associated cache is provided with the data storage system for receiving data. The data in the cache is periodically examined to determine if the data includes all sequential data contained within a complete stripe within the data storage system. Data is fetched from the N data storage drives into the cache and the parity for the stripe is calculated by logically combining the received data in the cache and fetched data from the data storage drives if the cache is determined not to include all sequential data contained within the complete stripe. Alternatively, the parity for the stripe is calculated by logically combining only data within the cache for the stripe, if data in the cache is determined to include all sequential data contained within a complete stripe, thereby minimizing the number of input/output operations required to update data.
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