Data placement and allocation using virtual contiguity
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United States of America Patent
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-
Nov 18, 2003
Grant Date -
Nov 14, 2002
app pub date -
May 8, 2001
filing date -
May 8, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A data storage system randomly determines a start offset at which to write objects to a storage medium. For updated blocks of the object, e.g., for blocks written during copy-on-write as part of a point-in-time snapshot, the updated block is written in the region of the original file or as close thereto as possible to achieve 'virtual contiguity'. Subsequent reads of the object read entire region containing both the object and, potentially, 'chaff' data other than the object. The 'chaff' data is discarded by the I/O system or file system using, e.g., a bit mask, subsequent to the read.
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