Patent ID: 7693883

Claim:
A method for managing a data volume of a data area, the method comprising: storing a plurality of data pages into a cache, wherein each of the stored plurality of data pages is a copy of a respective one of a plurality of data pages of the data volume; preventing writing of data pages to the data volume; designating each of the plurality of data pages stored in the cache as modified with respect to a respective data page stored in the data volume, wherein each one of a plurality of the data pages stored in the cache is identical to the respective data page stored in the data volume when the designating of that one as modified with respect to the respective data page stored in the data volume is initiated; writing all data pages in the cache that are designated as modified to a respective location in one or more other data volumes of the data area; for each of the written data pages, updating a converter page of the cache to associate the written data page with its respective location in the one or more other data volumes; identifying a plurality of converter pages of the cache that are associated with respective converter pages of the data volume; designating the plurality of converter pages as modified; writing all converter pages in the cache that are designated as modified to a respective location in the one or more other data volumes of the data area; and updating each of the written converter pages in the cache to indicate its respective location in the one or more other data volumes of the data area.