Patent ID: 9372908
Filing Date: 2016-06-21
CPC Classification: G06F

Claim Text:
1. A method, comprising: storing in a plurality of first data structures indications that indicate storage locations that need to be copied for forming a consistency group, and storing in a plurality of second data structures indications that indicate new host writes subsequent to starting a point in time copy operation to form the consistency group, wherein a first data structure and a second data structure are maintained in a track, and a plurality of tracks are maintained in a metadata storage area; in response to determining that the second data structure indicates that there are new host writes, updating the first data structure with contents of the second data structure to determine which additional storage locations need to be copied for formation of a next consistency group by performing an OR operation of corresponding bits of the first data structure and the second data structure, and updating the second data structure to indicate that the second data structure is in an initialized state; in response to determining that the second data structure indicates that there are no new host writes, updating of the first data structure with the contents of the second data structure is not performed; and in response to processing all of the plurality of tracks maintained in the metadata storage area, setting an indicator by a non-background task to indicate that all of the plurality of second data structures are now in the initialized state.