On-line data migration of a logical/virtual storage array by replacing virtual names

• US 7,697,554 B1
• Filed: 12/27/2005
• Issued: 04/13/2010
• Est. Priority Date: 12/27/2005
• Status: Active Grant

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: EMC Corporation (Dell Technologies Inc.)
• Inventors: Ofer, Adi, Madnani, Kiran, Brown, Jeffrey A.
• Primary Examiner(s): Cho; Hong
• Assistant Examiner(s): Foud; Hicham B
• Application Number:
  US11/318,734
• Time in Patent Office: 1,568 Days
• Field of Search: 711/5, 711/6, 711/165, 370/351, 370/389, 370/392, 370/401, 370/381, 370/412, 370/229, 709/213, 714/4
• US Class Current: 370/412
• CPC Class Codes: G06F 11/2082 Data synchronisation
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: H04L 2101/645 Fibre channel identifiers
• CPC Class Codes: H04L 61/30 Managing network names, e.g. use of aliases or nicknames name-to-address mapping H04L61/45
• CPC Class Codes: H04L 61/301 Name conversion
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

Data is transparently migrated between groups of logical units of storage presented as virtual arrays. A source virtual array has at least one source virtual port coupled to a fabric. Each source virtual port having a source virtual port name and a source virtual port address. A destination virtual array has one or more destination virtual ports coupled to the fabric, each destination virtual port having a destination virtual port name and a destination virtual port address. All data resident on the source virtual array is copied to the destination virtual array. The destination virtual port names and LUN names and numbers are then replaced with the source virtual port names and LUN names and numbers. The fabric then updates its name server database so that the database associates the source virtual port name with the destination virtual port address.

Claims

1. Apparatus for use in a storage system comprising a fabric having a database that associates Fibre Channel names and Fibre Channel addresses of Fibre Channel ports coupled to it, the apparatus comprising:

a plurality of groups of logical units of storage;

at least one physical port coupled to the groups through which the groups can be coupled to a fabric;

each group assigned a unique virtual port address for each physical port to which it is coupled;

a first said group comprising a source virtual array, the source virtual array having at least one source virtual port coupled to the fabric, each source virtual port having a source virtual port name and a source virtual port address;

a second said group comprising a destination virtual array, the destination virtual array having one or more destination virtual ports coupled to the fabric, each destination virtual port having a destination virtual port name and a destination virtual port address;

logic for copying all data resident on the source virtual array to the destination virtual array;

logic for replacing the destination virtual port names with the source virtual port names;

logic for causing the fabric to reload its name server database so that the database associates the source virtual port names with the destination virtual port addresses.

2. The apparatus of claim 1 wherein the source virtual array includes source LUNs for use by the host(s), each source LUN having a source LUN name and source LUN number, and wherein the destination virtual array includes destination LUNs for use by the hosts, each destination LUN having a destination LUN name and a destination LUN number, and wherein the logic for replacing further comprises logic for replacing the destination LUN names with the source LUN names.

3. The apparatus of claim 2 wherein the logic for replacing further comprises logic for replacing the destination LUN numbers with the source LUN numbers.

4. The apparatus of claim 3 further comprising a destination virtual port translation table associating the destination virtual port names with the source virtual port names, the destination translation table used by the logic for replacing for replacing the destination virtual port names with the source virtual port names.

5. The apparatus of claim 4 further comprising a destination LUN translation table associating the destination LUN names and numbers with the source LUN names and numbers, the destination LUN translation table used by the logic for replacing for replacing the destination LUN names and numbers with the source LUN names and numbers respectively.

6. The apparatus of claim 5 wherein the logic for replacing comprises a destination array controller capable of for enabling the destination port and destination LUN translation tables.

7. A program product comprising a computer readable medium having embodied therein a computer program for storing data, the computer program for operation in a system including a Fibre Channel fabric having a database that associates Fibre Channel names and Fibre Channel addresses of Fibre Channel ports coupled to it, a plurality of groups of logical units of storage, and at least one physical port coupled to the groups through which the groups can be coupled to a fabric, the program product comprising:

logic for assigning to each group a unique virtual port address for each physical port to which it is coupled, a first said group comprising a source virtual array, the source virtual array having at least one source virtual port coupled to the fabric, each source virtual port having a source virtual port name and a source virtual port address, a second said group comprising a destination virtual array, the destination virtual array having one or more destination virtual ports coupled to the fabric, each destination virtual port having a destination virtual port name and a destination virtual port address;

logic for copying all data resident on the source virtual array to the destination virtual array;

logic for replacing the destination virtual port names with the source virtual port names;

logic for causing the fabric to reload its name server database so that the database associates the source virtual port names with the destination virtual port addresses.

8. The program product of claim 7 wherein the source virtual array includes source LUNs for use by the host(s), each source LUN having a source LUN name and source LUN number, and wherein the destination virtual array includes destination LUNs for use by the hosts, each destination LUN having a destination LUN name and a destination LUN number, and wherein the logic for replacing further comprises logic for replacing the destination LUN names with the source LUN names.

9. The program product of claim 8 wherein the logic for replacing further comprises logic for replacing the destination LUN numbers with the source LUN numbers.

10. The program product of claim 9 wherein the logic for replacing uses a destination virtual port translation table associating the destination virtual port names with the source virtual port names for replacing the destination virtual port names with the source virtual port names.

11. The program product of claim 10 wherein the logic for replacing uses a destination LUN translation table associating the destination LUN names and numbers with the source LUN names and numbers for replacing the destination LUN names and numbers with the source LUN names and numbers respectively.

12. The program product of claim 11 wherein the logic for replacing comprises a destination array controller capable of enabling the destination port and destination LUN translation tables.

13. A method for operation in a system comprising:

a Fibre Channel fabric having a database that associates Fibre Channel names and Fibre Channel addresses of Fibre Channel ports coupled to it,

a plurality of groups of logical units of storage;

at least one physical port coupled to the groups through which the groups can be coupled to a fabric;

each group assigned a unique virtual port address for each physical port to which it is coupled;

a first said group comprising a source virtual array, the source virtual array having at least one source virtual port coupled to the fabric, each source virtual port having a source virtual port name and a source virtual port address;

a second said group comprising a destination virtual array, the destination virtual array having one or more destination virtual ports coupled to the fabric, each destination virtual port having a destination virtual port name and a destination virtual port address;

the method comprising the steps of;

copying all data resident on the source virtual array to the destination virtual array;

replacing the destination virtual port names with the source virtual port names;

causing the fabric to reload its name server database for use by the host(s) so that the database associates the source virtual port names with the destination virtual port addresses.

14. The method of claim 13 wherein the source virtual array includes source LUNs for use by the host(s), each source LUN having a source LUN name and source LUN number, and wherein the destination virtual array includes destination LUNs for use by the hosts, each destination LUN having a destination LUN name and a destination LUN number, and wherein the step of replacing further comprises replacing the destination LUN names with the source LUN names.

15. The method of claim 14 wherein the step of replacing further comprises replacing the destination LUN numbers with the source LUN numbers.

16. The method of claim 15 wherein the step of replacing uses a destination virtual port translation table associating the destination virtual port names with the source virtual port names for replacing the destination virtual port names with the source virtual port names.

17. The method of claim 16 wherein the step of replacing uses a destination LUN translation table associating the destination LUN names and numbers with the source LUN names and numbers for replacing the destination LUN names and numbers with the source LUN names and numbers respectively.

18. The method of claim 17 wherein the step of replacing uses a destination array controller for enabling the destination port and destination LUN translation tables.