Patent ID: 9223513
Filing Date: 2015-12-29
Classification: G06F

Abstract:
1. A method for accessing data in a data storage system, wherein the data storage system comprises at least a first volume and a second volume, and the first volume and the second volume remain consistent by a synchronous copy relationship, the method comprising: setting a virtual unique identifier of the second volume as a unique identifier of the first volume; creating a first path from a host to the first volume and a second path from the host to the second volume by using the unique identifier of the first volume; accessing data by using the first path from the host to the first volume; setting the second path from the host to the second volume as unavailable; in response to a failure of the first volume: setting the first path from the host to the first volume as unavailable; setting the second path from the host to the second volume as available; accessing data by using the second path from the host to the second volume; and suspending synchronous copying between the first volume and the second volume.