Distributed fine-grained enhancements for distributed table driven I/O mapping
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United States of America Patent
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Aug 10, 2004
Grant Date -
Feb 14, 2002
app pub date -
Jun 1, 2001
filing date -
Jun 2, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention provides a virtual storage system that generally stores uses larger segmentations, but divides large segments into smaller sub-segments during data movement operations. The present invention provides a method and system having this hierarchy of segment sizes, namely a large segment for the normal case, while breaking the large segment into single disk blocks during data movement. The mapping has large segments except for those segments undergoing data movement. For those segments, it would be desirable to have the smallest segment size possible, namely, a single disk block. In this way, the administration costs are generally low, but latencies caused by the movement of large data blocks are avoided.
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