Data migration system, method and program product

• US 7,337,197 B2
• Filed: 11/13/2003
• Issued: 02/26/2008
• Est. Priority Date: 11/13/2003
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Wilson, Forrest Lee, Blackburn, Jason Joseph
• Primary Examiner(s): Pham; Hung Q
• Application Number:
  US10/712,947
• Publication Number:
  US 20050108304A1
• Time in Patent Office: 1,566 Days
• Field of Search: 707/201, 707/10, 707/200, 707/204, 707/20, 711/100, 711/161, 711/162
• US Class Current: 1/1
• CPC Class Codes: G06F 16/10 File systems; File servers
• CPC Class Codes: G06F 3/0617 in relation to availability
• CPC Class Codes: G06F 3/0647 Migration mechanisms
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: Y10S 707/99955 Archiving or backup

Abstract

A data migration method that reads data from a source volume on a source data storage device. The data is read as a bit image of a logical volume, cylinder by cylinder, track by track, and bit by bit. The data is moved on as an image of the logical volume, on a cylinder by cylinder, track by track, and bit by bit basis.

Claims

1. 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.

2. The computer system of claim 1 wherein the logical volume comprises a physical volume.

3. A method of migrating computer data files between a source data storage device and a target data storage device comprising:

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 volume, 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 from 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.

4. The method of claim 3 wherein the logical volume comprises a physical volume.

5. A data processing system program product having executable instruction code stored on a machine-readable data storage medium for migrating data, wherein the executable instruction code when executed on a data processing system causes the data processing system to perform:

request data from a source volume on a 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;

output the requested data to a target volume of a target data storage device, 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 from 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.

6. The data processing system program product of claim 5 wherein the logical volume comprises a physical volume.