Virtual SCSI bus for SCSI-based storage area network

• US 7,281,062 B1
• Filed: 04/22/2002
• Issued: 10/09/2007
• Est. Priority Date: 04/22/2002
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Bakke, Mark A., De Groote, Stephen P., Kuik, Timothy J., Johnson, Craig A., Haapala, Clayton Stuart, Thompson, David Patrick
• Primary Examiner(s): Dalencourt; Yves
• Application Number:
  US10/131,793
• Time in Patent Office: 1,996 Days
• Field of Search: 709/249, 709/211, 709/217, 709/220, 709/230, 370/401, 370/466, 711/114, 711/118, 711/209, 718/104, 719/319
• US Class Current: 709/249
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices

Abstract

A storage router having an internet protocol (IP) port for coupling to a network supporting IP packets, a fibre channel port for coupling to a fibre channel network to a plurality of storage devices, and a SCSI router having an iSCSI interface that extracts SCSI command and data information from packets received through the IP port, wherein the SCSI router passes the extracted SCSI command and data information to the fiber channel port. Some embodiments further include a session to an information-handling system. The session supports a target-only mapping (wherein a source-specified target value is replaced by a mapped target value that is then passed by the SCSI router toward a first storage device and its LUNs), or target-and-LUN mapping (wherein source-specified target and LUN information is replaced by mapped target-and LUN information such as a loop-ID and LUN combination, a WWPN and LUN combination, or a WWNN).

Claims

1. A storage router apparatus comprising:

an internet protocol (IP) port for coupling to a network supporting IP packets, the network having a plurality of information-handling systems;

a fibre channel port for coupling to a fibre channel network to a plurality of storage devices; and

one or more SCSI routers to define one or more sessions, each session including an identification of a set of one or more targets on the plurality of storage devices and having an iSCSI application that extracts SCSI command and data information from packets received through the IP port, wherein the one or more SCSI routers are configured to pass extracted SCSI command and data information to the fibre channel port using a virtual SCSI bus including a virtual initiator and a virtual target in the storage router apparatus.

2. The apparatus of claim 1, wherein the one or more sessions include a first session to a first one of the plurality of information-handling systems, wherein the first session supports a first target-only mapping, wherein a source-specified target value received from the first information-handling system is replaced by a mapped target value that is then passed by a SCSI router of the one or more SCIS routers toward a first storage device.

3. The apparatus of claim 2, wherein the one or more sessions include a second session to a second one of the plurality of information-handling systems, wherein the second session supports a second target-only mapping, wherein a source-specified target value received from the second information-handling system is replaced by a mapped target value that is then passed by a SCSI router of the one or more SCIS routers toward the first storage device.

4. The apparatus of claim 2, wherein the one or more sessions include a second session to a second one of the plurality of information-handling systems, wherein the second session supports a third target-only mapping, wherein a source-specified target value received from the second information-handling system is replaced by a mapped target value that is then passed by a SCSI router of the one or more SCIS routers toward a second storage device.

5. The apparatus of claim 2, wherein the one or more sessions include a second session to a second one of the plurality of information-handling systems, wherein the second session supports a first target-and-LUN mapping, wherein a source-specified target value received from the second information-handling system is replaced by a mapped target-and-LUN value that is then passed by a SCSI router of the one or more SCIS routers toward a second storage device.

6. The apparatus of claim 1, wherein the one or more sessions include a first session to a first one of the plurality of information-handling systems, wherein the first session supports a first target-and-LUN mapping for the first session, wherein a source-specified target value received from the first information-handling system is replaced by a mapped target-and-LUN value that is then passed by a SCSI router of the one or more SCIS routers toward a first storage device.

7. The apparatus of claim 6, wherein the one or more sessions include a second session to a second one of the plurality of information-handling systems, wherein the second session supports a second target-and-LUN mapping for the second session, wherein a source-specified target value received from the second information-handling system is replaced by a mapped target-and-LUN value that is then passed by a SCSI router of the one or more SCIS routers toward the first storage device.

8. The apparatus of claim 6, wherein the one or more sessions include a second session to a second one of the plurality of information-handling systems, wherein the second session supports a second target-and-LUN mapping for the second session, wherein a source-specified target value received from the second information-handling system is replaced by a mapped target-and-LUN value that is then passed by a SCSI router of the one or more SCIS routers toward a second storage device.

9. The apparatus of claim 1, wherein the one or more sessions include a first target-only mapping for a first one of the sessions, and a second target-only mapping for a second one of the sessions.

10. The apparatus of claim 9, wherein the one or more sessions include a first target-and-LUN mapping for a third one of the sessions, and a second target-and-LUN mapping for a fourth one of the sessions.

11. A storage-router method comprising:

creating a plurality of sessions, wherein each session includes an identification of a set of one or more targets for a plurality of storage devices on a fibre channel network;

initiating a first session of the plurality of sessions to a first information-handling system of a plurality of information handling systems on a network supporting IP packets, the network having a plurality of information-handling systems;

receiving IP packets through an internet protocol (IP) port coupled to the network;

extracting a SCSI command and data from one or more of the received packets; and

using a virtual SCSI router including a virtual SCSI bus providing a connection between a virtual initiator and a virtual target to route the extracted SCSI command and data to a target of the one or more targets on a physical device, wherein the target is represented by the virtual target.

12. The method of claim 11, further comprising:

for the first session, performing a first target-only mapping for the first session, wherein a source-specified target value received from the first information-handling system is replaced by a mapped target value that is then passed by the virtual SCSI router toward a first storage device.

13. The method of claim 12, further comprising:

initiating a second session to a second one of the plurality of information-handling systems; and

for the second session, performing a second target-only mapping for the second session, wherein a source-specified target value received from the second information-handling system is replaced by a mapped target value that is then passed by the virtual SCSI router toward the first storage device.

14. The method of claim 12, further comprising:

initiating a second session to a second one of the plurality of information-handling systems; and

for the second session, performing a third target-only mapping for the second session, wherein a source-specified target value received from the second information-handling system is replaced by a mapped target value that is then passed by the virtual SCSI router toward a second storage device.

15. The method of claim 12, further comprising:

initiating a second session to a second one of the plurality of information-handling systems; and

for the second session, performing a first target-and-LUN mapping for the first session, wherein a source-specified target value received from the second information-handling system is replaced by a mapped target-and-LUN value that is then passed by the virtual SCSI router toward a second storage device.

16. The method of claim 11, further comprising:

for the first session, performing a first target-and-LUN mapping for the first session, wherein a source-specified target value received from the first information-handling system is replaced by a mapped target-and-LUN value that is then passed by the virtual SCSI router toward a first storage device.

17. The method of claim 16, further comprising:

initiating a second session to a second one of the plurality of information-handling systems; and

for the second session, performing a second target-and-LUN mapping for the second session, wherein a source-specified target value received from the second information-handling system is replaced by a mapped target-and-LUN value that is then passed by the virtual SCSI router toward the first storage device.

18. The method of claim 16, further comprising:

initiating a second session to a second one of the plurality of information-handling systems, wherein the second session supports

a second target-and-LUN mapping for the second session, wherein a source-specified target value received from the second information-handling system is replaced by a mapped target-and-LUN value that is then passed by the virtual SCSI router toward a second storage device.

19. The method of claim 11, further comprising:

performing a first target-only mapping for a first one of the plurality of sessions, and a second target-only mapping for a second one of the plurality of sessions.

20. The method of claim 19, further comprising:

performing a first target-and-LUN mapping for a third one of the plurality of sessions, and a second target-and-LUN mapping for a fourth one of the plurality of sessions.

21. The method of claim 11, further comprising:

performing a first target-and-LUN mapping for a first one of the plurality of sessions, and a second target-and-LUN mapping for a second one of the plurality of sessions.

22. A storage router apparatus comprising:

means for coupling an internet protocol (IP) port to a network supporting IP packets, the network having a plurality of information-handling systems;

means for coupling a storage port to a storage network connected to a plurality of storage devices;

means for creating one or more sessions, each session including an identification of a set of one or more targets on the plurality of storage devices; and

means for providing a virtual initiator and target associated with a session of the one or more sessions and connected through a virtual SCSI bus for mapping and routing SCSI command and data information from packets received through the IP port into SCSI command and data information sent out the storage port.

23. The apparatus of claim 22, wherein the means for providing a virtual initiator and target further includes means for performing a first target-only mapping.

24. The apparatus of claim 23, wherein the means for providing a virtual initiator and target further includes means for performing a second target-only mapping.

25. The apparatus of claim 23, wherein the means for providing a virtual initiator and target further includes means for performing a first target-and-LUN mapping.

26. The apparatus of claim 22, wherein the means for providing a virtual initiator and target further includes means for performing a first target-and-LUN mapping.

27. The apparatus of claim 26, wherein the means for performing the first target-and-LUN mapping includes means for mapping to a loop-ID and LUN combination.

28. The apparatus of claim 26, wherein the means for performing the first target-and-LUN mapping includes means for mapping to a WWPN and LUN combination.

29. The apparatus of claim 26, wherein the means for performing the first target-and-LUN mapping includes means for mapping to a WWNN.