Method and apparatus for resource allocation in a raid system
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United States of America Patent
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Aug 7, 2007
Grant Date -
Sep 25, 2003
app pub date -
Mar 21, 2002
filing date -
Mar 21, 2002
priority date (Note) -
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Abstract
The present invention implements an I/O task architecture in which an I/O task requested by the storage manager, for example a stripe write, is decomposed into a number of lower-level asynchronous I/O tasks that can be scheduled independently. Resources needed by these lower-level I/O tasks are dynamically assigned, on an as-needed basis, to balance the load and use resources efficiently, achieving higher scalability. A hierarchical order is assigned to the I/O tasks to ensure that there is a forward progression of the higher-level I/O task and to ensure that resources do not become deadlocked.
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