Patent ID: 7779296
Filing Date: 2010-08-17
Classification: G06F

Abstract:
1. A method of storing data comprising: copying base data from a first storage device of a source system to a master set on a second storage device of a remote host; receiving one or more requests to write data to one or more specified blocks on the first storage device; storing in a list one or more indications that the data at the one or more specified blocks has changed, wherein a further change to one specified block of the one or more specified blocks since a prior specified base time does not prompt a change to the one indication of the one or more indications corresponding to the one specified block of the one or more specified blocks; and at a specified base time and using the stored one or more indications, sending to a remote host associated with the second storage device a replica of the data stored at the one or more specified blocks as of that time; wherein the remote host is configured to make and store a copy of the base data stored in the one or more specified blocks in the master set on the second storage device prior to merging the replica of the data into the master set.