Space allocation in a write anywhere file system
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United States of America Patent
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Apr 19, 2011
Grant Date -
Jan 31, 2008
app pub date -
Oct 3, 2007
filing date -
Aug 18, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A file system determines the relative vacancy of a collection of storage blocks, i.e., an “allocation area”. This is accomplished by recording an array of numbers, each of which describes the vacancy of a collection of storage blocks. The file system examines these numbers when attempting to record file blocks in relatively contiguous areas on a storage medium, such as a disk. When a request to write to disk occurs, the system determines the average vacancy of all of the allocation areas and queries the allocation areas for individual vacancy rates. The system preferably writes file blocks to the allocation areas that are above a threshold related to the average storage block vacancy of the file system.
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