System and method for sharing storage resources

1. A method comprising:

discovering in a first PCIe domain:

a first PCIe host bridge adapter (PHBA); and

a storage resource coupled to a plurality of storage extents; and

in response to discovering the first PHBA and the storage resource in the first PCIe domain:

creating a first virtual function on the storage resource;

sending a first identifier for the first virtual function to the first PHBA, wherein the first PHBA is not within a second PCIe domain;

accessing one of the storage extents in the storage resource by a peer-to-peer transaction with the first virtual function;

transferring data from the first virtual function to a first PCIe end point within the first PCIe domain; and

transferring, by the first PHBA, the data from the first PCIe end point to a second PCIe end point in the second PCIe domain.

2. The method of claim 1 , further comprising associating a particular storage extent to the first virtual function.

3. The method of claim 2 , further comprising accessing the particular storage extent from the first PHBA.

4. The method of claim 3 , further comprising:

discovering in the PCIe domain a second PHBA; and

in response to discovering the second PHBA in the PCIe domain:

creating a second virtual function on the storage resource; and

sending a second identifier for the second virtual function to the second PHBA.

5. The method of claim 4 , further comprising associating a different particular storage extent to the second virtual function.

6. The method of claim 5 , further comprising accessing the different particular storage extent from the second PHBA.

7. The method of claim 1 , wherein the first identifier is a bus, device, and function (bus:dev:func address) of the first virtual function.

8. A method comprising:

discovering a first PCIe host bridge adapter (PHBA);

discovering in a first PCIe domain:

a first PCIe end point; and

a storage resource coupled to the first PCIe end point and coupled to a plurality of storage extents; and

in response to discovering the first PHBA, and in response to discovering the storage resource in the first PCIe domain:

creating a first virtual function on the storage resource;

sending a first identifier for the first virtual function to the first PHBA, wherein the first PHBA is not within either the first PCIe domain or a second PCIe domain;

transferring data from the first virtual function to the first PCIe end point; and

transferring, by the first PHBA, the data from the first PCIe end point to a second PCIe end point in the second PCIe domain.

9. The method of claim 8 , further comprising associating a particular storage extent to the first virtual function.

10. The method of claim 9 , further comprising accessing the particular storage extent from the first PHBA.

11. The method of claim 10 , further comprising:

discovering a second PHBA; and

in response to discovering the second PHBA:

creating a second virtual function on the storage resource; and

sending a second identifier for the second virtual function to the second PHBA, wherein the second PHBA is not within the first PCIe domain.

12. The method of claim 11 , further comprising associating a different particular storage extent to the second virtual function.

13. The method of claim 12 , further comprising accessing the different particular storage extent from the second PHBA.

14. The method of claim 8 , wherein the first identifier is a bus, device, and function (bus:dev:func address) of the first virtual function.

15. A method comprising:

discovering a first PCIe end point in a first PCIe domain;

discovering a first PCIe host bridge adapter (PHBA);

discovering in a second PCIe domain:

a second PCIe end point; and

a storage resource coupled to the second PCIe end point and coupled to a plurality of storage extents; and

in response to discovering the first PHBA, and in response to discovering the storage resource in the second PCIe domain:

creating a first virtual function on the storage resource;

sending a first identifier for the first virtual function to the first PHBA, wherein the first PHBA enables, wherein the first PHBA is not within either the first PCIe domain or the second PCIe domain;

transferring data from the first virtual function to the second PCIe end point; and

transferring, by the first PHBA, the data from the second PCIe end point to the first PCIe end point.

16. The method of claim 15 , further comprising associating a particular storage extent to the first virtual function.

17. The method of claim 16 , further comprising accessing the particular storage extent from the first PHBA.

18. The method of claim 17 , further comprising:

discovering a third PCIe end point in a third PCIe domain;

discovering a fourth PCIe end point coupled to the storage resource in the second PCIe domain;

discovering a second PHBA; and

in response to discovering the second PHBA:

creating a second virtual function on the storage resource; and

sending a second identifier for the second virtual function to the second PHBA, wherein the second PHBA is not within the first, second, or third PCIe domains;

transferring data from the second virtual function to the fourth PCIe end point; and

transferring, by the second PHBA, the data from the fourth PCIe end point to the third PCIe end point.

19. The method of claim 18 , further comprising associating a different particular storage extent to the second virtual function.

20. The method of claim 19 , further comprising accessing the different particular storage extent from the second PHBA.