Patent ID: 7953949
Filing Date: 2011-05-31
Classification: G06F,H04L,Y10S

Abstract:
1. A computer system comprising: a first storage system providing a first logical unit; a second storage system coupled to the first storage system, providing a second logical unit; and a computer coupled to the first and the second storage systems, including an application and I/O management module, in which the I/O management module is configured to manage mapping relation between a logical position recognized by the application and identifiers of the first logical unit in the first storage system and the second logical unit in the second storage system; wherein at least one of the first and the second storage systems migrates data stored in the first logical unit of the first storage system to the second logical unit of the second storage system as to be consistent with the first logical unit in the first storage system, wherein the I/O management module changes the mapping relation as to correlate the logical position recognized by the application with the second logical unit in the second storage system from the first logical unit in the first storage system, based on notification from at least one of the first and the second storage systems, and controls access to the logical position from the application by issuing I/O request to the second logical unit in the second storage system instead of the first logical unit in the first storage system.