Patent ID: 9514139
Filing Date: 2016-12-06
CPC Classification: G06F

Claim Text:
1. A computer implemented method for a space efficient cascading point-in-time copying of source data by mapping a plurality of cascading point-in-time target copies, the target copies being created at different points in time, the method comprising: physically copying data from the source data to a repository to create a physical copy; creating a data mapping that associates the physical copy with a most recent target copy of said plurality of cascading target point-in-time copies, the data mapping indicating shared mapping and non-shared mapping, the shared mapping indicating that an address of the physical copy in the repository is shared with at least one previously created target copy; and updating the data mapping of one or more target copies of said plurality of cascading target point-in-time copies that are older than a designated target copy of said plurality of cascading target point-in-time copies, so as to include information relating to the designated target copy;