Systems and methods for intercepting data relating to storage volume access

• US 8,417,818 B1
• Filed: 07/24/2012
• Issued: 04/09/2013
• Est. Priority Date: 12/23/2011
• Status: Active Grant

• Current Assignee: Cirrus Data Solutions, Inc.
• Original Assignee: Cirrus Data Solutions, Inc.
• Inventors: Lam, Wai T., Lam, Wayne, Liu, Chang
• Primary Examiner(s): BAROT, BHARAT
• Application Number:
  US13/556,726
• Time in Patent Office: 259 Days
• Field of Search: 709202-203, 709223-226, 370360-363, 370400-401, 714 42- 43
• US Class Current: 709/226
• CPC Class Codes: G06F 3/0607 by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
• CPC Class Codes: G06F 3/0617 in relation to availability
• CPC Class Codes: G06F 3/0635 by changing the path, e.g. traffic rerouting, path reconfiguration
• 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 63/101 Access control lists [ACL]
• 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 target world wide port name of a target port of a storage system is identified, by a device located in a path between a switch port of a switch and the target port of the storage system. A first port of the device is registered with the switch based on the target world wide port name, in a first registration procedure. Registration information relating to an initiator port of a server that is associated with the target port is received, in a second registration procedure. An initiator world wide port name of the initiator port of the server is determined, based on the registration information. A storage volume in the storage system that is associated with the initiator port is identified, based on the initiator world wide port name of the initiator port.

Claims

1. A non-transitory computer readable medium having program instructions stored thereon, that, in response to execution by a computing device located in a path between a switch port of a switch and a target port of a storage system, cause the computing device to perform operations comprising:

identifying a target world wide port name of the target port of the storage system;

registering, in a first registration procedure, a first port of the computing device with the switch based on the target world wide port name;

receiving, in a second registration procedure, registration information comprising first information relating to an initiator port of a server that is associated with the target port and second information specifying a particular switch port to which the initiator port is connected;

determining an initiator world wide port name of the initiator port of the server, based on the registration information; and

identifying a storage volume in the storage system that is associated with the initiator port, based on the initiator world wide port name of the initiator port.

2. The non-transitory computer readable medium of claim 1, further comprising program instructions, which, in response to execution by the computing device, cause the computing device to perform operations comprising:

assigning the target world wide port name to the first port of the computing device.

3. The non-transitory computer readable medium of claim 1, wherein the second registration procedure comprises registration by the initiator port with the computing device via the first port.

4. The non-transitory computer readable medium of claim 3, further comprising program instructions, which, in response to execution by the computing device, cause the computing device to perform operations comprising:

receiving, in the second registration procedure, a switch port identifier associated with an initiator port of a server that is zoned to the target port.

5. The non-transitory computer readable medium of claim 1, further comprising program instructions, which, in response to execution by the computing device, cause the computing device to perform operations comprising:

accessing a Simple Name Server table that identifies, for each of one or more ports of the switch, a corresponding world wide port name.

6. The non-transitory computer readable medium of claim 1, further comprising program instructions, which, in response to execution by the computing device, cause the computing device to perform operations comprising:

transmitting, to the storage system, a REPORT LUN command including the initiator world wide port name; and

receiving, from the storage system, in response to the REPORT LUN command, information identifying the storage volume to which the initiator world wide port name has access.

7. The non-transitory computer readable medium of claim 6, further comprising program instructions, which, in response to execution by the computing device, cause the computing device to perform operations comprising:

transmitting, to the storage system, a SCSI inquiry relating to the storage volume to which the initiator world wide port name has access;

receiving, in response to the SCSI inquiry, information indicating a global unique identifier of the storage volume; and

determining whether two storage volumes associated with the initiator world wide port name are identical based on the global unique identifier.

8. The non-transitory computer readable medium of claim 1, further comprising program instructions, which, in response to execution by the computing device, cause the computing device to perform operations comprising:

registering, by the computing device, in the first registration procedure, the first port of the computing device with the switch based on the target world wide port name and on a second world wide port name uniquely associated with the first port of the computing device.

9. The non-transitory computer readable medium of claim 1, further comprising program instructions, which, in response to execution by the computing device, cause the computing device to perform operations comprising:

adding the initiator world wide port name of the initiator port of the server to an interceptor port of the computing device;

adding a second initiator world wide port name of a second initiator port of the server to the interceptor port of the computing device;

transmitting, by the interceptor port of the computing device, to the storage system, one or more commands specifying the initiator world wide port name of the initiator port of the server and the second initiator world wide port name of the second initiator port of the server;

identifying, by the computing device, a first storage volume in the storage system that is associated with the initiator port, based on the initiator world wide port name of the initiator port; and

identifying, by the computing device, a second storage volume in the storage system that is associated with the second initiator port, based on the second initiator world wide port name of the second initiator port.

10. An apparatus comprising:

means for identifying a target world wide port name of a target port of a storage system;

means for registering, in a first registration procedure, a first port of a computing device with a switch based on the target world wide port name;

means for receiving, in a second registration procedure, registration information comprising first information relating to an initiator port of a server that is associated with the target port and second information specifying a particular switch port to which the initiator port is connected;

means for determining an initiator world wide port name of the initiator port of the server, based on the registration information; and

means for identifying a storage volume in the storage system that is associated with the initiator port, based on the initiator world wide port name of the initiator port.

11. The apparatus of claim 10, further comprising:

means for assigning the target world wide port name to the first port of the computing device.

12. The apparatus of claim 10, wherein the second registration procedure comprises registration by the initiator port with the computing device via the first port.

13. The apparatus of claim 10, further comprising:

means for receiving, in the second registration procedure, a switch port identifier associated with an initiator port of a server that is zoned to the target port.

14. The apparatus of claim 10, further comprising:

means for accessing a Simple Name Server table that identifies, for each of one or more ports of the switch, a corresponding world wide port name.

15. The apparatus of claim 10, further comprising:

means for transmitting, to the storage system, a REPORT LUN command including the initiator world wide port name; and

means for receiving, from the storage system, in response to the REPORT LUN command, information identifying the storage volume to which the initiator world wide port name has access.

16. The apparatus of claim 15, further comprising:

means for transmitting, to the storage system, a SCSI inquiry relating to the storage volume to which the initiator world wide port name has access;

means for receiving, in response to the SCSI inquiry, information indicating a global unique identifier of the storage volume; and

means for determining whether two storage volumes associated with the initiator world wide port name are identical based on the global unique identifier.

17. The apparatus of claim 10, further comprising:

means for registering, in the first registration procedure, the first port of the computing device with the switch based on the target world wide port name and on a second world wide port name uniquely associated with the first port of the computing device.

18. The apparatus of claim 10, further comprising:

means for adding the initiator world wide port name of the initiator port of the server to an interceptor port of the computing device;

means for adding a second initiator world wide port name of a second initiator port of the server to the interceptor port of the computing device;

means for transmitting, to the storage system, one or more commands specifying the initiator world wide port name of the initiator port of the server and the second initiator world wide port name of the second initiator port of the server;

means for identifying a first storage volume in the storage system that is associated with the initiator port, based on the initiator world wide port name of the initiator port; and

means for identifying a second storage volume in the storage system that is associated with the second initiator port, based on the second initiator world wide port name of the second initiator port.