Resolving Failed Mirrored Point-in-Time Copies with Minimum Disruption

摘要

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 disaster recovery site. The data for the source and target of the failed point in time copy are logically and physically equal at that point in time. This logical relationship can be maintained, and protected against ongoing physical updates to the affected tracks on the source secondary volume, by first reading the affected tracks from the source secondary volume, copying the data to the target secondary volume, and then writing the updated track to the source secondary volume.

主权项

1. A computer-implemented method for resolving failed mirrored point in time copies, comprising:
determining when a 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; and, 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.