Minimizing configuration changes in a fabric-based data protection solution

• US 7,979,656 B2
• Filed: 08/06/2008
• Issued: 07/12/2011
• Est. Priority Date: 06/01/2004
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: InMage Systems, Inc. (Microsoft Corporation)
• Inventors: Gosavi, Omkar, Atluri, Rajeev, Bhatt, Kumar Swamy, Gottemukkula, Yeganjaiah
• Primary Examiner(s): LANE, JOHN A
• Application Number:
  US12/186,636
• Publication Number:
  US 20080294843A1
• Time in Patent Office: 1,070 Days
• Field of Search: 709/213, 709/216, 709/217, 711/6, 711/161, 711/162, 711/170
• US Class Current: 711/162
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/0637 Permissions
• CPC Class Codes: G06F 3/065 Replication mechanisms
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: H04L 49/357 Fibre channel switches
• 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 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

A method, system, and apparatus of minimizing configuration of changes in a fabric-based data protection solution. In one embodiment, a method includes configuring a switch such that a write request to a primary storage device is transferred through a virtual initiator in the switch to the primary storage device and to a secondary storage device, and configuring the switch such that a read request from the secondary initiator of a data in the primary storage device appears as though the read request is coming from a physical initiator rather than the secondary initiator (e.g., such that system protocol may be bypassed because the switch intercepts a response having the data from the primary storage device through a virtual target which uses the virtual initiator of the switch to communicate the data to the secondary initiator rather than the physical initiator).

Claims

1. A method, comprising:

configuring a switch such that a write request to a primary storage device is transferred through a virtual initiator in the switch to the primary storage device and to a secondary storage device;

configuring the switch such that a read request from a secondary initiator of data in the primary storage device appears as though the read request is coming from a physical initiator rather than the secondary initiator, such that at least one system protocol is bypassed because the switch intercepts a response having the data from the primary storage device through a virtual target which uses the virtual initiator of the switch to communicate the data to the secondary initiator rather than the physical initiator;

minimizing configuration of nodes of a continuous-backup system through the configuration of the switch and the interception of the response in the switch; and

wherein a binding between the primary storage device, the secondary storage device, the physical initiator, and the secondary initiator is created through a frame redirect zone in a switch fabric and through an application of a twenty-four bit Fiber Channel address of the physical initiator to the virtual initiator in the switch such that the virtual initiator appears to the primary storage devices as the physical initiator.

2. The method of claim 1 wherein the write request originates from the physical initiator.

3. The method of claim 2 wherein the write request is transferred to the virtual target in the switch before being transferred through the virtual initiator in the switch to the primary storage device and to the secondary storage device.

4. The method of claim 1, wherein the at least one system protocol is at least one of a Fiber Channel zoning protocol, logic unit number (LUN) masking protocol and a small computer system interface (SCSI) reservation protocol.

5. The method of claim 4:

further comprising a plurality of physical initiators that access a single primary storage logic unit number (LUN);

wherein the secondary initiator is bound to each of the plurality of physical initiators and using the binding to bypass a SCSI reservation.

6. The method of claim 5 wherein the secondary initiator bypasses the SCSI reservation by using a multipath module to perform read input/output operations.

7. The method of claim 6 wherein the storage device can be presented across a plurality of backup servers.

8. The method of claim 1 wherein the switch is part of a storage area network, and wherein the nodes include the physical initiator and the secondary initiator.

9. The method of claim 1 wherein the data is a current state of information on the primary storage device.

10. The method of claim 1 in a form of a machine-readable storage medium embodying a set of instructions that, when executed by a machine, causes the machine to perform the method of claim 1.

11. A system of a switch, comprising:

a transfer module to communicate a write request to a primary storage device through a virtual initiator in the switch to the primary storage device and to a secondary storage device;

an intercept module to make a read request of a data in a primary storage device appear as though the read request is coming from a physical initiator rather than a secondary initiator, such that at least one system protocol is bypassed because the switch intercepts a response having the data from the primary storage device through a virtual target which uses the virtual initiator of the switch to communicate the data to the secondary initiator rather than the physical initiator;

an optimization module to minimize configuration of nodes of a continuous-backup system through the configuration of the switch and the interception of the response in the switch; and

wherein a binding between the primary storage device, the secondary storage device, the physical initiator, and the secondary initiator is created through a frame redirect zone in a switch fabric and through an application of a twenty-four bit Fiber Channel address of the physical initiator to the virtual initiator in the switch such that the virtual initiator appears to the primary storage devices as the physical initiator.

12. The switch of claim 11 wherein the write request is transferred to the virtual target in the switch before being transferred through the virtual initiator in the switch to the primary storage device and to the secondary storage device.

13. The switch of claim 11 wherein the at least one system protocol is at least one of a Fiber Channel zoning protocol, logic unit number (LUN) masking protocol and a small computer system interface (SCSI) reservation protocol.

14. The switch of claim 11 wherein the switch is part of a storage area network, and wherein the nodes include the physical initiator and the secondary initiator.

15. The switch of claim 11 wherein the data is a current state of information on the primary storage device.