Patent ID: 9355119
Filing Date: 2016-05-31
CPC Classification: G06F

Claim Text:
1. A method comprising: initiating, by a storage management computing device, a time-displaced data migration operation to migrate data from a source data structure to a destination data structure; assigning, by the storage management computing device, a virtual block number for an absent data block in a logical view of the destination data structure; assigning, by the storage management computing device, an absent allocated indicator as a physical block number associated with the virtual block number in the logical view of the destination data structure to indicate that data of a data block of the source data structure is absent from the destination data structure, wherein the logical view of the destination data structure comprises a hierarchical logical mapping and the absent allocated indicator is stored in place of a physical block number for the absent data block at a data level of the hierarchical logical mapping; and providing, by the storage management computing device, contemporaneously with the absent allocated indicator, an absent data block determinative indicator that the data of the data block of the source data structure is absent from the destination data structure, wherein the absent data block determinative indicator is stored external to the destination data structure.