Patent ID: 7386693

Claim:
A method in a data processing system, comprising: creating data volumes V 1,1 -V 1,n wherein data volume V 1,1 is created as a point-in-time (PIT) copy of a volume V, and wherein each data volume V 1,x of data volumes V 1,2 -V 1,n is created as a PIT copy of data volume V 1,x−1 ; creating data volumes V 2,1 -V 2,m wherein data volume V 2,1 is created as a PIT copy of the volume V, and wherein each data volume V 2,y of data volumes V 2,2 -V 2,m is created as a PIT copy of data volume V 2,y−1 ; generating a refresh instruction for refreshing the data contents of data volume V 2,y to the data contents of one of the data volumes V 1,1 -V 1,n .