Patent ID: 8799599
Filing Date: 2014-08-05
Classification: G06F

Abstract:
1. A method for data migration between storage systems, comprising: discovering a first logical storage structures of a first storage system wherein data is migrated from first storage devices coupled to the first storage system and stored in second storage devices coupled to a second storage system; creating an image mode volume on the second storage system including image mode logical storage structures, including virtual disks, that match the discovered first logical storage structures, wherein the image mode volume is a proxy for the first logical storage structures of the first storage system; notifying a multi-pathing module in a computing node to redirect the transmission of realtime data for storage on the second storage system instead of the first storage system, wherein the multi-pathing module communicates with the first storage system via a primary communication path and communicates with the second storage system via a secondary communication path; wherein the multi-pathing module passes data read operations to the image mode volume for read data not yet migrated to the second storage system, wherein the data read operations fulfilled by the image mode volume from the first storage system, wherein the image mode volume stores read data from the first storage system on the second storage devices to complete migration of the read data; and initiating a migration of stored data on the first storage system to the second storage devices of the second storage system over a migration communication path between the first storage system and the second storage system to transparently perform data migration between the first storage system and the second storage system non-disruptively to the computing node, wherein the first storage system provides a notification when the migration completes in order to permit the host to access the second storage system as a primary storage system.