Patent ID: 7475206
Filing Date: 2009-01-06
Classification: G06F

Abstract:
1. A data migration method comprising: servicing I/O requests made by an application executing on a host system, including communicating I/O commands to a logical volume group comprising a plurality of first volumes in a first data system and a plurality of second volumes in a second data system different from the first data system; receiving a priority value associated with the application, wherein the priority value identifies the application as having a higher priority than other applications executing on the host system; monitoring I/O activity of the first volumes in the first data system, the I/O activity being measured as the number of read and write commands issued by the first application to the first volumes per unit of time; monitoring I/O activity of the second volumes in the second data system, the I/O activity being measured as the number of read and write commands issued by the first application to the second volumes per unit of time; selectively initiating a first copy operation to copy one of the first volumes to a target volume in the first data system based on the priority value and the I/O activity of the first volumes, the target volume being obtained from a storage pool in the first data system; and selectively initiating a second copy operation to copy one of the second volumes to a target volume in the second data system selectively initiated based on the priority value and the I/O activity of the second volumes, the target volume being obtained from a storage pool in the second data system.