System and method for expediting transfer of data from a local storage facility to a remote storage facility

• US 6,839,763 B1
• Filed: 02/28/2001
• Issued: 01/04/2005
• Est. Priority Date: 02/28/2001
• Status: Expired due to Term

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: EMC Corporation (Dell Technologies Inc.)
• Inventors: Kamvysselis, Peter, Arnon, Dan
• Primary Examiner(s): Eng, David Y.
• Application Number:
  US09/804,479
• Time in Patent Office: 1,406 Days
• Field of Search: 709/220, 709/227, 709/230, 709/223, 714/52, 714/722, 714/822
• US Class Current: 709/230
• CPC Class Codes: H04L 67/1095 Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A data transfer arrangement transfers data from a source device, such as a local mass storage facility, to a destination device, such as a remote storage facility. The data transfer arrangement comprises a source device and a destination device. The source device transfers to the destination device a data block including data and padding along with a source check value that is a function of the data and selectively the padding, and a check indication indicating whether the check value is the function of the data alone, or the data and the padding. The destination device, after receiving the data block, source check value and check indication, generates a destination check value that is the function of the data alone, or the data and the padding, based on the check indication, and uses the source and destination check values to determine whether the data block was correctly received.

Claims

1. A data transfer arrangement for transferring data from a source device to a destination device, the data transfer arrangement comprising:

A. a source interface module associated with the source device, the source interface module being configured to

(i) receive a data block, the data block including a data portion containing the data to be transferred, and a padding portion containing padding, and

(ii) transfer the data block to the destination device along with

(a) a check portion including a source check value, the source check value being a selected function of the data contained in the data portion and selectively the padding contained in the padding portion and

(b) a check indication indicating whether the check value is the selected function of

(I) the data contained in the data portion alone, or

(II) the data contained in the data portion and the padding contained in the padding portion; and

B. a destination interface module associated with the destination device, the destination interface module being configured to

(i) receive the data block and the check indication from the source interface module;

(ii) generate a destination check value that is the selected function of

(a) the data contained in the portion alone, or

(b) the data contained in the data portion and the padding contained in the padding portion,

in conformity with the check indication, and

(iii) using the source and destination check values, determine whether the data block was correctly received.

2. A data transfer arrangement as defined in claim 1 in which the destination interface module is further configured to provide a notification to the source interface module based on whether the destination interface module correctly received the data block.

3. A data transfer arrangement as defined in claim 1 in which the source interface module is further configured to generate the source check value for transfer in the check portion.

4. A data transfer arrangement as defined in claim 1 in which the source device also includes a memory subsystem configured to store the data block, the source interface module being configured to receive the data block by retrieving the data block from the memory subsystem.

5. A data transfer arrangement as defined in claim 1 in which the destination interface module is further configured to store the data block in a memory subsystem included in the destination device if it determines that the data block was correctly received.

6. A source interface for use in connection with a data transfer arrangement for transferring data from a source device to a destination device, the source interface module being associated with the source device, the source interface module comprising:

(A) a data block receiver module configured to receive a data block, the data block including a data portion containing the data to be transferred, and a padding portion containing padding, and

(B) a data block transfer module configured to transfer the data block to the destination along with

(i) a check portion including a source check value, the source check value being a selected function of the data contained in the data portion and selectively the padding contained in the padding portion and

(ii) a check indication indicating whether the check value is the selected function of

(a) the data contained in the data portion alone, or

(b) the data contained in the data portion and the padding contained in the padding portion.

7. A source interface as defined in claim 6 further comprising a source check value generator module configured to generate the source check value for transfer in the check portion.

8. A source interface as defined in claim 6 in which the source device also includes a memory subsystem configured to store the data block, the source interface module being configured to receive the data block by retrieving the data block from the from the memory subsystem.

18. A method as defined in claim 7 further comprising a source check value generation step including the step of generating the source check value for transfer in the check portion.

19. A method as defined in claim 18 in which the source device also includes a memory subsystem configured to store the data block, the receiving step including the step of retrieving the data block from the from the memory subsystem.

9. A destination interface for use in connection with a data transfer arrangement for transferring data from a source device to a destination device, the destination interface being associated with the destination device, the destination interface comprising:

(A) a data block receiver module configured to receive

(i) a data block including

(a) a data portion containing the data to be transferred,

(b) a padding portion containing padding and

(c) a check portion including a source check value, the source check value being a selected function of the data contained in the data portion and selectively the padding contained in the padding portion and

(ii) a check indication indicating whether the check value is the selected function of

(a) the data contained in the data portion alone, or

(b) the data contained in the data portion and the padding contained in the padding portion;

(B) a destination check value generator module configured to generate a destination check value that is the selected function of

(i) the data contained in the portion alone, or

(ii) the data contained in the data portion and the padding contained in the padding portion,

in conformity with the check indication, and

(C) a data block verification module configured to use the source and destination check values to determine whether the data block was correctly received.

10. A destination interface as defined in claim 9 in which the data block verification module is further configured to generate a notification for transfer to the source device based on whether the data block was correctly received.

11. A destination interface as defined in claim 10 further comprising a memory interface configured to store the data block in a memory subsystem if the data block verification module determines that the data block was correctly received.

12. A method of transferring data from a source device to a destination device, the method comprising the steps of

A. at the source device:

(i) receiving a data block, the data block including a data portion containing the data to be transferred, and a padding portion containing padding, and

(ii) transferring the data block to the destination device along with

(a) a check portion including a source check value, the source check value being a selected function of the data contained in the data portion and selectively the padding contained in the padding portion and

(b) a check indication indicating whether the check value is the selected function of

(I) the data contained in the data portion alone, or

(II) the data contained in the data portion and the padding contained in the padding portion; and

B. at the destination device;

(i) receiving the data block and the check indication from the source device;

(ii) generating a destination check value that is the selected function of

(a) the data contained in the portion alone, or

(b) the data contained in the data portion and the padding contained in the padding portion,

in conformity with the check indication, and

(iii) using the source and destination check values, determining whether the data block was correctly received.

13. A method as defined in claim 12 further comprising the step of, at the destination device, providing a notification to the source device as to whether the destination device correctly received the data block.

14. A method as defined in claim 12 further comprising the step of, at the source device, generating the source check value for transfer in the check portion.

15. A method as defined in claim 12 in which the receiving step at the source device includes the step of retrieving the data block from a memory subsystem.

16. A method as defined in claim 15 further including the step of, at the destination device, store the data block in a memory subsystem if it determines that the data block was correctly received.

17. A method of operating a source interface for use in connection with a data transfer arrangement for transferring data from a source device to a destination device, the source interface module being associated with the source device, the method including the steps of:

(A) receiving a data block, the data block including a data portion containing the data to be transferred, and a padding portion containing padding, and

(B) transferring the data block to the destination along with

(i) a check portion including a source check value, the source check value being a selected function of the data contained in the data portion and selectively the padding contained in the padding portion and

(ii) a check indication indicating whether the check value is the selected function of

(a) the data contained in the data portion alone, or

(b) the data contained in the data portion and the padding contained in the padding portion.

20. A method of operating a destination interface for use in connection with a data transfer arrangement for transferring data from a source device to a destination device, the destination interface being associated with the destination device, the destination interface comprising:

(A) a data block receiving step including the step of receiving

(i) a data block including

(a) a data portion containing the data to be transferred,

(b) a padding portion containing padding and

(c) a check portion including a source check value, the source check value being a selected function of the data contained in the data portion and selectively the padding contained in the padding portion and

(ii) a check indication indicating whether the check value is the selected function of

(a) the data contained in the data portion alone, or

(b) the data contained in the data portion and the padding contained in the padding portion;

(B) a destination check value generation step including the step of generating a destination check value that is the selected function of

(i) the data contained in the portion alone, or

(ii) the data contained in the data portion and the padding contained in the padding portion,

in conformity with the check indication, and

(C) a data block verification step including the step of using the source and destination check values to determine whether the data block was correctly received.

21. A method as defined in claim 20 in which the data block verification step further includes the step of generating a notification for transfer to the source device based on whether the data block was correctly received.

22. A method as defined in claim 21 further including the step of storing the data block in a memory subsystem if, during the data block verification step, it was determining that the data block was correctly received.

23. A computer program product for use in connection with at least one programmable device to provide a data transfer arrangement for transferring data from a source device to a destination device, the computer program product comprising a device-readable medium having encoded thereon

A. a source interface module associated with the source device, the source interface module being configured to enable the at least one programmable device to

(i) receive a data block, the data block including a data portion containing the data to be transferred, and a padding portion containing padding, and

(ii) transfer the data block to the destination device along with

(a) a check portion including a source check value, the source check value being a selected function of the data contained in the data portion and selectively the padding contained in the padding portion and

(b) a check indication indicating whether the check value is the selected function of

(I) the data contained in the data portion alone, or

(II) the data contained in the data portion and the padding contained in the padding portion;

and

B. a destination interface module associated with the destination device, the destination interface module being configured to enable the at least one programmable device to

(i) receive the data block and the check indication from the source interface module;

(ii) generate a destination check value that is the selected function of

(a) the data contained in the portion alone, or

(b) the data contained in the data portion and the padding contained in the padding portion,

in conformity with the check indication, and

(iii) using the source and destination check values, determine whether the data block was correctly received.

24. A computer program product as defined in claim 23 in which the destination interface module is further configured to enable the at least one programmable device to provide a notification to the source interface module based on whether the destination interface module correctly received the data block.

25. A computer program product as defined in claim 23 in which the source interface module is further configured to enable the at least one programmable device to generate the source check value for transfer in the check portion.

26. A computer program product as defined in claim 23 in which the source device also includes a memory subsystem configured to enable the at least one programmable device to store the data block, the source interface module being configured to enable the at least one programmable device to receive the data block by retrieving the data block from the memory subsystem.

27. A computer program product as defined in claim 23 in which the destination interface module is further configured to enable the at least one programmable device to store the data block in a memory subsystem included in the destination device if it determines that the data block was correctly received.

28. A computer program product for use in connection with a programmable device to facilitate transfer of data from a source device to a destination device, the computer program product being associated with the source device, the computer program product comprising a device-readable medium having encoded thereon:

(A) a data block receiver module configured to enable the at least one programmable device to receive a data block, the data block including a data portion containing the data to be transferred, and a padding portion containing padding, and

(B) a data block transfer module configured to enable the at least one programmable device to transfer the data block to the destination along with

(i) a check portion including a source check value, the source check value being a selected function of the data contained in the data portion and selectively the padding contained in the padding portion and

(ii) a check indication indicating whether the check value is the selected function of

(a) the data contained in the data portion alone, or

(b) the data contained in the data portion and the padding contained in the padding portion.

29. A computer program product as defined in claim 28 further comprising a source check value generator module configured to enable the at least one programmable device to generate the source check value for transfer in the check portion.

30. A computer program product as defined in claim 28 in which the source device also includes a memory subsystem configured to store the data block, the computer program product being configured to enable the at least one programmable device to receive the data block by retrieving the data block from the from the memory subsystem.

31. A computer program product for use in connection with a data transfer arrangement for transferring data from a source device to a destination device, the computer program product being associated with the destination device, the computer program product comprising a device-readable medium having encoded thereon:

(A) a data block receiver module configured to enable the at least one programmable device to receive

(i) a data block including

(a) a data portion containing the data to be transferred,

(b) a padding portion containing padding and

(c) a check portion including a source check value, the source check value being a selected function of the data contained in the data portion and selectively the padding contained in the padding portion and

(ii) a check indication indicating whether the check value is the selected function of

(a) the data contained in the data portion alone, or

(b) the data contained in the data portion and the padding contained in the padding portion;

(B) a destination check value generator module configured to enable the at least one programmable device to generate a destination check value that is the selected function of

(i) the data contained in the portion alone, or

(ii) the data contained in the data portion and the padding contained in the padding portion,

in conformity with the check indication, and

(C) a data block verification module configured to enable the at least one programmable device to use the source and destination check values to determine whether the data block was correctly received.

32. A computer program product as defined in claim 31 in which the data block verification module is further configured to enable the at least one programmable device to generate a notification for transfer to the source device based on whether the data block was correctly received.

33. A computer program product as defined in claim 32 further comprising a memory interface configured to enable the at least one programmable device to store the data block in a memory subsystem if the data block verification module determines that the data block was correctly received.