RECEIVING DATA IN A DATA STORE IN A SERVER COMPUTER SYSTEM

• US 20090007261A1
• Filed: 06/29/2007
• Published: 01/01/2009
• Est. Priority Date: 06/29/2007
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Smith, Mark A.
• Granted Patent: US 8,615,798 B2
• Time in Patent Office: Days
• US Class Current: 726/21
• CPC Class Codes: H04L 9/3247 involving digital signatures

Abstract

The present invention provides a method and system of receiving data in a data store in a server computer system. In an exemplary embodiment, the method and system include (1) receiving client authentication information of a client computer system, (2) receiving a data signature of the data from the client computer system, and (3) attempting to locate in the data store at least one data chunk with a stored data signature equal to the received data signature.

Claims

1. A method of receiving data in a data store in a server computer system, the method comprising:

receiving client authentication information of a client computer system;

receiving a data signature of the data from the client computer system; and

attempting to locate in the data store at least one data chunk with a stored data signature equal to the received data signature.

2. The method of claim 1 further comprising, if the data chunk is not located:

indicating what information needs to be sent to the data store;

accepting the indicated information; and

storing the received information.

3. The method of claim 2 wherein, if the server computer system is stateless, the indicating comprises indicating that the data, the data signature of the data, and the client authentication information of the client computer system needs to be sent to the data store.

4. The method of claim 3 wherein the accepting comprises accepting the indicated data, the indicated data signature, and the indicated client authentication information from the client computer system.

5. The method of claim 4 wherein the storing comprises storing the accepted data, the accepted data signature, and the accepted client authentication information as the guarantor of the accepted data signature.

6. The method of claim 2 wherein, if the server computer system is stateful, the indicating comprises indicating that the data needs to be sent to the data store.

7. The method of claim 6 wherein the accepting comprises accepting the indicated data from the client computer system.

8. The method of claim 7 wherein the storing comprises storing the accepted data, the received data signature, and the received client authentication information as the guarantor of the received data signature.

9. The method of claim 1 further comprising, if the data chunk is located and if the stored data signature for the located data chunk is marked as verified:

performing de-duplication of the data with the data chunk; and

indicating that the data does not need to be received from the client computer system.

10. The method of claim 1 further comprising, if the data chunk is located and if the received client authentication information is equal to the stored guarantor client authentication information of the stored data signature:

performing de-duplication of the data with the data chunk; and

indicating that the data does not need to be received from the client computer system.

11. The method of claim 1 further comprising, if the data chunk is located and if the guarantor represented by the stored guarantor client information of the stored data signature is trusted by the client represented by the received client authentication information:

performing de-duplication of the data with the data chunk; and

indicating that the data does not need to be received from the client computer system.

12. The method of claim 1 further comprising, if the data chunk is located and if the stored data signature for the located data chunk is not marked as verified and if the received client authentication information is not equal to the stored client authentication information of the stored data signature and if the guarantor represented by the stored guarantor client information of the stored data signature is not trusted by the client represented by the received client authentication information:

calculating a data signature for the located data chunk; and

comparing the calculated data signature to the stored data signature.

13. The method of claim 12 further comprising, if the calculated data signature is equal to the stored data signature:

marking the stored data signature as verified in a catalog of stored data signatures of stored data chunks in the server computer system;

performing de-duplication of the data with the data chunk; and

indicating that the data does not need to be received from the client computer system.

14. The method of claim 12 further comprising, if the calculated data signature is not equal to the stored data signature:

replacing the stored data signature with the calculated data signature;

marking the calculated data signature as verified in a catalog of stored data signatures of stored data chunks in the server computer system;

indicating what information needs to be sent to the data store;

accepting the indicated information; and

storing the received information.

15. The method of claim 14 wherein, if the server computer system is stateless, the indicating comprises indicating that the data, the data signature of the data, and the client authentication information of the client computer system needs to be sent to the data store.

16. The method of claim 15 wherein the accepting comprises accepting the indicated data, the indicated data signature, and the indicated client authentication information from the client computer system.

17. The method of claim 16 wherein the storing comprises storing the accepted data, the accepted data signature, and the accepted client authentication information as the guarantor of the accepted data signature.

18. The method of claim 14 wherein, if the server computer system is stateful, the indicating comprises indicating that the data needs to be sent to the data store.

19. The method of claim 18 wherein the accepting comprises accepting the indicated data from the client computer system.

20. The method of claim 19 wherein the storing comprises storing the accepted data, the received data signature, and the received client authentication information as the guarantor of the received data signature.

21. A system of receiving data in a data store in a server computer system, the system comprising:

a receiving module configured to receive client authentication information of a client computer system;

a receiving module configured to receive a data signature of the data from the client computer system; and

an attempting module configured to attempt to locate in the data store at least one data chunk with a stored data signature equal to the received data signature.

22. The system of claim 21 further comprising, if the data chunk is not located,

an indicating module configured to indicate what information needs to be sent to the data store;

an accepting module configured to accept the indicated information; and

a storing module configured to store the received information.

23. The system of claim 22 wherein, if the server computer system is stateless, the indicating module comprises an indicating module configured to indicate that the data, the data signature of the data, and the client authentication information of the client computer system needs to be sent to the data store.

24. The system of claim 23 wherein the accepting module comprises an accepting module configured to accept the indicated data, the indicated data signature, and the indicated client authentication information from the client computer system.

25. The system of claim 24 wherein the storing module comprises a storing module configured to store the accepted data, the accepted data signature, and the accepted client authentication information as the guarantor of the accepted data signature.

26. The system of claim 22 wherein, if the server computer system is stateful, the indicating module comprises an indicating module configured to indicate that the data needs to be sent to the data store.

27. The system of claim 26 wherein the accepting module comprises an accepting module configured to accept the indicated data from the client computer system.

28. The system of claim 27 wherein the storing module comprises a storing module configured to store the accepted data, the received data signature, and the received client authentication information as the guarantor of the received data signature.

29. The system of claim 21 further comprising, if the data chunk is located and if the stored data signature for the located data chunk is marked as verified:

a performing module configured to perform de-duplication of the data with the data chunk; and

an indicating module configured to indicate that the data does not need to be received from the client computer system.

30. The system of claim 21 further comprising, if the data chunk is located and if the received client authentication information is equal to the stored guarantor client authentication information of the stored data signature:

a performing de-duplication of the data with the data chunk; and

an indicating module configured to indicate that the data does not need to be received from the client computer system.

31. The system of claim 21 further comprising, if the data chunk is located and if the guarantor represented by the stored guarantor client information of the stored data signature is trusted by the client represented by the received client authentication information:

a performing module configured to perform de-duplication of the data with the data chunk; and

an indicating module configured to indicate that the data does not need to be received from the client computer system.

32. The system of claim 21 further comprising, if the data chunk is located and if the stored data signature for the located data chunk is not marked as verified and if the received client authentication information is not equal to the stored client authentication information of the stored data signature and if the guarantor represented by the stored guarantor client information of the stored data signature is not trusted by the client represented by the received client authentication information:

a calculating module configured to calculate a data signature for the located data chunk; and

a comparing module configured to compare the calculated data signature to the stored data signature.

33. The system of claim 32 further comprising, if the calculated data signature is equal to the stored data signature:

a marking module configured to mark the stored data signature as verified in a catalog of stored data signatures of stored data chunks in the server computer system;

a performing module configured to perform de-duplication of the data with the data chunk; and

an indicating that the data does not need to be received from the client computer system.

34. The system of claim 32 further comprising, if the calculated data signature is not equal to the stored data signature:

a replacing module configured to replace the stored data signature with the calculated data signature;

a marking module configured to mark the calculated data signature as verified in a catalog of stored data signatures of stored data chunks in the server computer system;

an indicating module configured to indicate what information needs to be sent to the data store;

an accepting module configured to accept the indicated information; and

a storing module configured to store the received information.

35. A computer program product usable with a programmable computer having readable program code embodied therein of receiving data in a data store in a server computer system, the computer program product comprising:

computer readable code for receiving client authentication information of a client computer system;

computer readable code for receiving a data signature of the data from the client computer system; and

computer readable code for attempting to locate in the data store at least one data chunk with a stored data signature equal to the received data signature.