Patent ID: 8566282
Filing Date: 2013-10-22
Classification: G06F

Abstract:
1. A method of operating a copy function to create a point-in-time copy relationship, comprising: initiating a point-in-time copy function to create a new point-in-time copy relationship from a source volume comprising a first volume to a target volume comprising a second volume; detecting that the target volume of the new point-in-time copy relationship is a source volume of a first pre-existing point-in-time copy relationship having as a target volume a third volume; detecting that the target volume of the first pre-existing point-in-time copy relationship is a source volume of a second pre-existing point-in-time copy relationship having as a target volume a fourth volume; and creating a buffer point-in-time copy relationship having a source volume comprising the target volume of the first pre-existing relationship and a target volume comprising a fifth volume in response to detecting that the target volume of the new point-in-time copy relationship is the source volume of the first pre-existing point-in-time copy relationship and the detecting that the target volume of the first pre-existing point-in-time copy relationship is the source volume of the second pre-existing point-in-time copy relationship.