In a data storage system providing access to a production dataset and snapshot copies of the production dataset, a production meta bit map identifies blocks of storage that are invalid in the production dataset. If a block in the production dataset is invalid when a snapshot copy is being made, then...http://www.google.com/patents/US6792518?utm_source=gb-gplus-sharePatent US6792518 - Data storage system having mata bit maps for indicating whether data blocks are invalid in snapshot copies
Data storage system having mata bit maps for indicating whether data blocks ...
