Method for validating operation of a fibre link

• US 7,055,068 B2
• Filed: 07/25/2002
• Issued: 05/30/2006
• Est. Priority Date: 07/25/2002
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: LSI Logic Corporation (Broadcom, Inc.)
• Inventors: Riedl, Daniel A.
• Primary Examiner(s): Baderman, Scott
• Assistant Examiner(s): Contino, Paul F.
• Application Number:
  US10/205,265
• Publication Number:
  US 20040019833A1
• Time in Patent Office: 1,405 Days
• Field of Search: 714/42, 714/43, 714/717, 714/715, 370/241, 370/222, 379/1.04, 398/13, 398/20, 398/21, 398/59, 398/166
• US Class Current: 714/43
• CPC Class Codes: G06F 13/4221 being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus

Abstract

A method for validating operation of a fiber link when the fiber link is initialized includes the steps of entering a trial link up state upon receiving a command to initialize the fiber link so that normal commands to other devices within the fiber channel loop are not resumed, and thereafter entering a final link up state and resuming normal commands to other devices within the fiber channel loop. In exemplary embodiments, the method may be implemented by devices within a system such as a disk array system of a storage area network (SAN), or the like.

Claims

1. A method for validating operation of a fibre link within a fibre channel loop, comprising:

receiving a Loop Initialization Primitive (LIP) to initialize the fibre link;

entering a trial link up state upon receiving the Loop Initialization Primitive (LIP) so that normal commands to other devices within the fibre channel loop are not resumed; and

thereafter entering a final link up state and resuming normal commands to other devices within the fibre channel loop,

wherein a Loop Initialization Primitive (LIP) command is not sent by any device within the fibre channel loop during the trial link up state.

2. The method as claimed in claim 1 wherein the Loop Initialization Primitive (LIP) includes a Loop Initialization Primitive completion frame (LILP).

3. The method as claimed in claim 1, further comprising sending a no operation frame (NOP) while in the trial linkup state, and receiving the no operation frame (NOP) whereupon the final linkup state is entered upon receiving the no operation frame (NOP).

4. The method as claimed in claim 1, further comprising sending a self-directed command while in the trial linkup state and receiving the self-directed command for verifying that the fibre link is stable.

5. The method as claimed in claim 4, wherein the self-directed command comprises at least one of a read command and a write command.

6. A system capable of validating operation of a fibre link of the system, comprising:

means for receiving a command to initialize the fibre link, the command to initialize the fibre link comprising a Loop Initialization Primitive (LIP);

means for entering a trial link up state upon receiving a command to initialize the fibre link so that normal commands to other devices within a fibre channel loop are not resumed; and

means for thereafter entering a final link up state and resuming normal commands to other devices within the fibre channel loop,

wherein a Loop Initialization Primitive (LIP) command is not sent by any device within the fibre channel loop during the trial link up state.

7. The system as claimed in claim 6, wherein the Loop Initialization Primitive (LIP) includes a Loop Initialization Primitive completion frame (LILP).

8. The system as claimed in claim 6, further comprising means for sending a no operation frame (NOP) while in the trial linkup state, and receiving the no operation frame (NOP) whereupon the final linkup state is entered upon receiving the no operation frame (NOP).

9. The system as claimed in claim 6, further comprising means for sending a self-directed command while in the trial linkup state and receiving the self-directed command for verifying that the fibre link is stable.

10. The system as claimed in claim 9, wherein the self-directed command comprises at least one of a read command and a write command.

11. A disk array system, comprising:

a disk array controller for controlling devices within the disk array system; and

a device within the disk array system, the device being coupled to the disk array controller via a fibre channel loop,

wherein at least one of the disk array controller and the device is capable of validating operation of a fibre link within the fibre channel loop by entering a trial link up state upon receiving a command to initialize the fibre link so that normal commands to other devices within the fibre channel loop are not resumed and thereafter entering a final link up state and resuming normal commands to other devices within the fibre channel loop,

wherein a Loop Initialization Primitive (LIP) command is not sent by any device within the fibre channel loop during the trial link up state, and

wherein at least one of the disk array controller and the device sends a no operation frame (NOP) to itself while in the trial linkup state and enters the final linkup state upon receiving the no operation frame (NOP).

12. The disk array system as claimed in claim 11, wherein the disk array controller provided a command to initialize the fibre link to the device.

13. The disk array system as claimed in claim 12, wherein the command to initialize the fibre link comprises a Loop Initialization Primitive (LIP).

14. The disk array system as claimed in claim 13, wherein the Loop Initialization Primitive (LIP) includes a Loop Initialization Primitive completion frame (LILP).

15. The disk array system as claimed in claim 11, wherein at least one of the disk array controller and the device is capable of sending and receiving a self-directed command while in the trial linkup state for verifying that the fibre link is stable.

16. The disk array system as claimed in claim 15, wherein the self-directed command comprises at least one of a read command and a write command.

17. A storage area network, comprising:

a disk array controller for controlling devices within a disk array system; and

a device within the disk array system, the device being coupled to the disk array controller via a fibre link,

wherein at least one of the disk array controller and the device is capable of validating operation of a fibre link by entering a trial link up state upon receiving a command to initialize the fibre link so that normal commands to other devices within a fibre channel loop are not resumed and thereafter entering a final link up state and resuming normal commands to other devices within the fibre channel loop,

wherein a Loop Initialization Primitive (LIP) command is not sent by any device within the fibre channel loop during the trial link up state, and

wherein at least one of the disk array controller and the device sends a no operation frame (NOP) to itself while in the trial linkup state and enters the final linkup state upon receiving the no operation frame (NOP).

18. The storage area network as claimed in claim 17, wherein the disk array controller provides a command to initialize the fibre link to the device.

19. The storage area network as claimed in claim 18, wherein the command to initialize the fibre link comprises a Loop Initialization Primitive (LIP).

20. The storage area network as claimed in claim 19, wherein the Loop Initialization Primitive (LIP) includes a Loop Initialization Primitive completion frame (LILP).

21. The storage area network as claimed in claim 17, wherein at least one of the disk array controller and the device is capable of sending and receiving a self-directed command while in the trial linkup state for verifying that the fibre link is stable.

22. The storage area network as claimed in claim 17, wherein the self-directed command comprises at least one of a read command and a write command.