Patent ID: 7607037
Filing Date: 2009-10-20
Classification: G06F

Abstract:
1. A method for recovering data from a target site upon the occurrence of a disaster at a primary site comprising: performing data replication processing propagating consistent point in time copies of data from a primary site to a target site; performing restart processing that determines a processing state of said data replication processing at a time of said disaster, wherein determining said state of said data replication processing when said target site and said primary site are not included in a multi-hop configuration includes determining, for one or more pairs of devices in said target site used in said data replication processing, whether each of said pairs is in a split state having a first device of said each pair split from a second device of said each pair, and if each of said pairs is in a split state, determining which device of said each pair includes a more recent consistent copy of data; and propagating a most recent one of said consistent point in time copies of data from one or more devices of said target site to one or more devices of said primary site, wherein said performing data replication processing is performed from a first host computer connected to said primary site, wherein propagating data from said target site to said primary site includes propagating data from a designated device in said target site while running in a protected mode having a backup copy of data from the designated device, and said performing restart processing and said propagating are automatically performed from a second host computer connected to said target site and wherein more than one consistent point in time copy of data is located on said target site at a same point in time, each of said more than one consistent point in time copy of data on said target site corresponding to a copy of data at a different point in time, said propagating further including: reconfiguring at least one device to create a first device relationship pairing and at least one device link to facilitate propagating data from said target site to said primary site; and propagating data from said target site to said primary site using said first device relationship.