Storage device identification replication

• US 20060026458A1
• Filed: 07/30/2004
• Published: 02/02/2006
• Est. Priority Date: 07/30/2004
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Grover, Rajiv K., Popp, Matthias, Knight, Frederick E.
• Application Number:
  US10/909,179
• Publication Number:
  US 20060026458A1
• Time in Patent Office: Days
• US Class Current: 714/6
• CPC Class Codes: G06F 11/1076 Parity data used in redundant arrays of independent storages, e.g. in RAID systems
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/0632 by initialisation or re-initialisation of storage systems
• CPC Class Codes: G06F 3/065 Replication mechanisms
• CPC Class Codes: G06F 3/0683 Plurality of storage devices

Abstract

A system and method implemented on a storage device comprising a controller. In one embodiment, a controller identifier of the storage device'"'"'s controller is combined with a logical unit number (“LUN”) associated with data stored on the storage device to produce a first value. The embodiment further comprises receiving a second value comprising a controller identifier of another storage device'"'"'s controller combined with a LUN associated with data stored on the other storage device, and combining the first and second values.

Claims

1. A method implemented on a storage device comprising a controller, comprising:

combining a controller identifier of the storage device'"'"'s controller with a logical unit number (“

LUN”

) associated with data stored on the storage device to produce a first value;

receiving a second value comprising a controller identifier of another storage device'"'"'s controller combined with a LUN associated with data stored on the other storage device; and

combining the first and second values.

2. The method of claim 1 further wherein combining the controller identifier of the storage device with the LUN associated with data stored on the storage device comprises concatenating the controller identifier and the LUN.

3. The method of claim 1 further comprising sorting the first and second values prior to combining the first and second values.

4. The method of claim 1 wherein combining the first and second values comprises concatenating the first and second values.

5. The method of claim 1 further comprising transmitting the first value to the other storage device.

6. The method of claim 1 further comprising using the combined first and second values as a device identifier for the data associated with the unit identifier.

7. The method of claim 6 further comprising transmitting the device identifier to a host for subsequent use to access said data.

8. The method of claim 1 further comprising transmitting the combined first and second values to a host for subsequent use to access said data.

9. A system, comprising:

at least a first storage device comprising a controller and coupled to a host; and

at least a second storage device comprising a controller and coupled to said host;

wherein the first storage device combines a controller identifier of the controller in the first storage device with a logical unit number (“

LUN”

) associated with data stored on the first storage device to produce a first value, and combines the first value with a second value received from the second storage device.

10. The system of claim 9 wherein the first storage device sorts the first value and the second value.

11. The system of claim 9 wherein the controller identifier comprises a serial number of the controller in the first storage device.

12. The system of claim 9 wherein the combined first and second values are used as a device identifier for a logical unit in the first storage device.

13. The system of claim 12 wherein the device identifier comprises a world wide identifier (“

WWID”

).

14. The system of claim 12 wherein the logical unit in the first storage comprises data that is common to a logical unit in the second storage device.

15. The system of claim 9 wherein the second storage device receives the first value from the first storage device and uses the first value to produce a device identifier associated with a logical unit in the second device that is the same as the device identifier for the logical unit in the first storage device.

16. A storage device, comprising:

a controller; and

a storage medium coupled to said controller and adapted to store a logical unit;

wherein said controller combines a controller identifier of said controller with a logical unit number (“

LUN”

) to generate a first value, and combines the first value with a second value generated by another storage device to form a device identifier used by host logic to access said logical unit, said second value generated using a controller identifier associated with the other storage device and a LUN associated with a logical unit contained in the other storage device.

17. The storage device of claim 16 wherein said controller sorts the combined first and second values.

18. The storage device of claim 16 wherein said controller combines its controller identifier with a LUN by concatenating the controller identifier and LUN.

19. The storage device of claim 16 wherein the storage device transmits the first value to the other storage device to be used by the other storage device to generate a device identifier that is the same as the device identifier used by the host logic.

20. The storage device of claim 16 wherein the controller combines the first and second values by concatenating the first and second values.

21. The storage device of claim 16 wherein the controller combines the first and second values by placing the first and second values in a predetermined order and concatenating the ordered first and second values.

22. A storage device, comprising:

means for storing logical units; and

means for forming a device identifier for a logical unit based on information in the storage device and information received from another storage device, said device identifier being identical to a device identifier formed in the other storage device;

said information comprising at least a logical unit number and a controller identifier.

23. The storage device of claim 22 wherein said means for forming the device identifier comprises means for concatenating a logical unit number associated with a logical unit with a unique identifier associated with the means for forming the device identifier.

24. The storage device of claim 22 wherein said means for forming the device identifier comprises means for combining the information in the storage device and the information received from the other storage device.