In response to these and other needs, the present invention provides a virtual storage system that generally uses larger segmentations, but has the ability to divide the large segments into smaller sub-segments during data movement operations. The mapping has large segments except for those segments...http://www.google.de/patents/US20020029326?utm_source=gb-gplus-sharePatent US20020029326 - Centralized fine-grained enhancements for distributed table driven I/O mapping
