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SAN Snapshot DB performance

Last Modified: 2013-11-14
When you do a SAN Snapshot of a database, using VSS technology, (through any vendor),

*is it always only a refresh of the newly written data since the last snapshot?
*Is there any vendor who provides a complete snapshot that is 100% new copy of the source database, so that there is no impact on performance and interdependence between source and new snapshot database?
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