Content addressed storage device configured to maintain content address mapping

• US 7,856,525 B2
• Filed: 06/30/2008
• Issued: 12/21/2010
• Est. Priority Date: 11/08/2004
• Status: Active Grant

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: EMC Corporation (Dell Technologies Inc.)
• Inventors: McConnell, William, Urmston, Richard
• Primary Examiner(s): Gu; Shawn X
• Application Number:
  US12/217,061
• Publication Number:
  US 20080270684A1
• Time in Patent Office: 904 Days
• Field of Search: None
• US Class Current: 711/108
• CPC Class Codes: G06F 16/90339 by using parallel associative memories or content-addressable memories

Abstract

A content addressed storage device configured to maintain content address mapping is disclosed. A data object to be stored on the content addressed storage device and a local data object identifier by which the data object is known to the sending source are received from a sending source. A content address to be associated with the data object on the content addressed storage device is determined based at least in part on the contents of the data object. The data object is stored on the content addressed storage device in a storage location associated with the content address. A mapping that associates the local data object identifier with the content address is maintained on the content addressed storage device.

Claims

1. A method for storing data on a content addressed storage device, comprising:

receiving from a sending source a request associated with storing a data object on the content addressed storage device wherein the request includes a local data object identifier by which the data object is known to the sending source and the sending source is external to the content addressed storage device; and

at the content addressed storage device and in response to receiving the request associated with storing;

determining, based at least in part on the contents of the data object, a content address to be associated with the data object on the content addressed storage device;

storing the data object on the content addressed storage device in a storage location associated with the content address; and

storing on the content addressed storage device a mapping that associates the local data object identifier with the content address.

2. A method as recited in claim 1, wherein the sending source comprises a sending application.

3. A method as recited in claim 1, wherein storing on the content addressed storage device a mapping that associates the local data object identifier with the content address comprises updating a content map associated with the sending source.

4. A method as recited in claim 1, wherein the local data object identifier includes a file name associated with the data object on a local host associated with the sending source.

5. A method as recited in claim 1, wherein the local data object identifier includes a file path associated with the data object on a local host associated with the sending source.

6. A method as recited in claim 1, wherein the data object comprises a file.

7. A method as recited in claim 1, further comprising reporting to the sending source that the data object was stored successfully.

8. A method as recited in claim 1, further comprising determining whether a source identifier associated with the sending source is known and, if the source identifier is known, using the source identifier to identify a content map associated with the sending source, wherein said mapping is stored in said content map.

9. A method as recited in claim 1, further comprising:

receiving from a requestor a request to access the data object, the request from the requestor including the local data object identifier;

determining the content address associated with the local data object identifier using (1) the mapping and (2) the local data object identifier included in the request to access the data object;

retrieving the data object using the content address; and

providing the data object to the requestor.

10. A method as recited in claim 9, wherein the requestor is the sending source.

11. A method as recited in claim 10, wherein the sending source comprises a sending application.

12. A content addressed storage device, comprising:

a communication interface configured to receive from a sending source a request associated with storing a data object on the content addressed storage device wherein the request includes a local data object identifier by which the data object is known to the sending source and the sending source is external to the content addressed storage device;

a memory; and

a processor at the content addressed storage device and configured to, in response to receiving the request associated with storing;

determine based at least in part on the contents of the data object a content address to be associated with the data object on the content addressed storage device;

store the data object in the memory at a storage location associated with the content address; and

storing on the content addressed storage device a mapping that associates the local data object identifier with the content address.

13. A content addressed storage device as recited in claim 12, wherein the processor is configured to store on the content addressed storage device a mapping that associates the local data object identifier with the content address at least in part by updating a content map associated with the sending source.

14. A content addressed storage device as recited in claim 12, wherein the processor is further configured to report to the sending source that the data object was stored successfully.

15. A content addressed storage device as recited in claim 12, wherein the processor is further configured to determine whether a source identifier associated with the sending source is known and, if the source identifier is known, use the source identifier to identify a content map associated with the sending source, wherein said mapping is stored in said content map.

16. A content addressed storage device as recited in claim 12, wherein:

the communication interface is further configured to receive from a requestor a request to access the data object, the request from the requestor including the local data object identifier; and

the processor is further configured to determine the content address associated with the local data object identifier using (1) the mapping and (2) the local data object identifier included in the request to access the data object, retrieve the data object using the content address, and provide the data object to the requestor.

17. A computer program product for storing data on a content addressed storage device, the computer program product being embodied in a recordable computer readable medium and comprising computer instructions for:

receiving from a sending source a request associated with storing a data object on the content addressed storage device wherein the request includes a local data object identifier by which the data object is known to the sending source and the sending source is external to the content addressed storage device; and

at the content addressed storage device and in response to receiving the request associated with storing;

determining based at least in part on the contents of the data object a content address to be associated with the data object on the content addressed storage device;

storing the data object on the content addressed storage device in a storage location associated with the content address; and

storing on the content addressed storage device a mapping that associates the local data object identifier with the content address.

18. A computer program product as recited in claim 17, wherein storing on the content addressed storage device a mapping that associates the local data object identifier with the content address comprises updating a content map associated with the sending source.

19. A computer program product as recited in claim 17, further comprising computer instructions for reporting to the sending source that the data object was stored successfully.

20. A computer program product as recited in claim 17, further comprising computer instructions for determining whether a source identifier associated with the sending source is known and, if the source identifier is known, using the source identifier to identify a content map associated with the sending source, wherein said mapping is stored in said content map.

21. A computer program product as recited in claim 17, further comprising computer instructions for:

receiving from a requestor a request to access the data object, the request from the requestor including the local data object identifier;

determining the content address associated with the local data object identifier using (1) the mapping and (2) the local data object identifier included in the request to access the data object;

retrieving the data object using the content address; and

providing the data object to the requestor.