Patent ID: 7337197

Claim:
A computer system for migrating data comprising; a server interfacing with a plurality of data storage devices, said server configured to migrate computer data files from one of said data storage device as a source to a second data storage device as a target by: requesting data from a source volume on the source data storage device, in accordance with a map file having source and target volume parameters, as a bit image of a logical volume, cylinder by cylinder, track by track, and bit by bit, wherein the source volume is mapped to a target logical unit number (LUN) on a small computer system interface (SCSI) bus; outputting the requested data to a target volumne, wherein all write commands go to the source volume and the target volume during outputting the requested data, and writing the requested data on the target data storage device as a bit image of the logical volume, cylinder by cylinder, track by track, and bit by bit, wherein updates to the source are detected and updated tracks containing said updates are recopied as a bit image form the source to the target; placing a busy condition on the source volume after outputting data; setting a SCSI ID to identify the target volume for access; and repeating requesting data and outputting data on a logical volume by logical volume basis, whereby a user accesses data from the source volume and moves off of the source volume at the same time.