Patent ID: 7650366
Filing Date: 2010-01-19
Classification: G06F

Abstract:
1. A computer method for generating persistent consistency point images (PCPIs), comprising: obtaining a first set of write statistics for a plurality of data containers associated with a first storage space; generating the PCPIs for each of the plurality of data containers associated with the first storage space from which the first set of write statistics were obtained; obtaining a second set of write statistics for the plurality of data containers associated with the first storage space from which the first set of write statistics were obtained; determining the modifying operations were performed to at least one data container of the plurality of data containers while generating the PCPIs for each of the plurality of data containers, if the first and the second set of write statistics of the first storage space are not equal; deleting each of the generated PCPIs in response to determining that modifying operations were performed to the at least one data container of the plurality of data containers, while generating the PCPIs for each of the plurality of data containers; determining that no modifying operations were performed to the at least one data container of the plurality of data containers while generating the PCPIs for each of the plurality of data containers, if the first and the second set of write statistics of the first storage space are equal; and storing the generated PCPIs for each of the plurality of data containers on a storage device in response to determining that no modifying operations were performed to the at least one data containers of the plurality of data containers, while generating the PCPIs for each of the plurality of data containers, whereby each PCPI for each of the plurality of data containers comprises modifying operations up to a time of the first set of statistics.