Patent ID: 9720786
Date: 2017-08-01
CPC Classifications: G06F

Claim:
1. A computer-implemented method for resolving failed mirrored point in time copies, comprising: performing a mirrored point in time copy operation within an asynchronous remote mirror environment; determining when the mirrored point in time copy fails; identifying a point in time when the mirrored point in time copy fails, at that point in time all the data for making the source and target of the point in time copy consistent is available on secondary volumes at a disaster recovery site; maintaining and protecting a logical relationship between the source and the target of the failed point in time copy to prevent ongoing physical updates to any affected tracks on the source secondary volume as data for the source and target of the failed point in time copy are logically and physically equal at that point in time; and establishing a control data structure to track a logical correspondence between the source secondary volume and the target secondary volume when a mirrored point in time copy between the source secondary volume and the target secondary volume fails; and wherein the performing and determining are performed by an asynchronous mirroring system; and, the identifying, maintaining and protecting and establishing are performed by a failure resolution system.