Data replication with rollback

摘要

Aspects of the invention provide for a storage device to selectively replicate one or more data portions from a real dataspace to a virtual dataspace, and for selective rollback of data portions from the virtual dataspace to the real dataspace. Aspects further enable a storage device to preserve real data portions otherwise modified by a rollback to the virtual dataspace, for the use of same size real and virtual dataspaces, and for one or more variably sized extents or logs to be utilized.