Method and apparatus for decomposing I/O tasks in a RAID system
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United States of America Patent
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Dec 31, 2013
Grant Date -
Aug 4, 2011
app pub date -
Mar 15, 2011
filing date -
Mar 21, 2002
priority date (Note) -
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Abstract
A data access request to a file system is decomposed into a plurality of lower-level I/O tasks. A logical combination of physical storage components is represented as a hierarchical set of objects. A parent I/O task is generated from a first object in response to the data access request. A child I/O task is generated from a second object to implement a portion of the parent I/O task. The parent I/O task is suspended until the child I/O task completes. The child I/O task is executed in response to an occurrence of an event that a resource required by the child I/O task is available. The parent I/O task is resumed upon an event indicating completion of the child I/O task. Scheduling of any child I/O task is not conditional on execution of the parent I/O task, and a state diagram regulates the child I/O tasks.
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