System and method for storing storage operating system data in switch ports

• US 7,159,080 B1
• Filed: 12/20/2001
• Issued: 01/02/2007
• Est. Priority Date: 12/20/2001
• Status: Expired due to Fees

• Current Assignee: NetApp, Inc.
• Original Assignee: Network Appliance Incorporated (NetApp, Inc.)
• Inventors: Aster, Radek, Coatney, Susan M.
• Primary Examiner(s): Thai; Tuan V.
• Application Number:
  US10/027,330
• Time in Patent Office: 1,839 Days
• Field of Search: 709/200, 709/212, 709/213, 709/214, 711/100, 711/147, 711/148, 711/154, 711/114
• US Class Current: 711/147
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• 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]

Abstract

A system and method of storing data for use by storage operating systems in memories associated with switch ports. The data is written to a switch port memory, which is readable by all devices connected to the switch, and by all devices connected to a switching fabric containing that switch. When a device connected to the switching fabric requires the information, the device retrieves the stored information from the switch-port memory, without the need for any interaction of the device that originally wrote the data.

Claims

1. A method for storing and distributing data in a network storage system having a plurality of devices interconnected with one or more switches, the method comprising:

writing, by one of the plurality of devices, a set of data to a memory associated with a port of one of the one or more switches, the memory being readable by all of the plurality of devices;

reading, by one of the plurality of devices, the set of data from the memory;

including in the set of data identification of one or more disks that are offline and inaccessible to any of the plurality of devices; and

including in the set of data a disk identification string, the disk identification string indicating a name of a switch, a port number on the switch, and a disk number.

2. The method of claim 1, wherein the set of data further comprises:

a unique identification of one of the devices; and

an address of the one of the devices.

3. The method of claim 1, wherein the unique identification of one of the devices further comprises a unique serial number of the device.

4. The method of claim 1, wherein the address of one of the devices further comprises a fully qualified network address.

5. The method of claim 1, wherein the memory associated with a port further comprises a Symbolic Port Name field.

6. The method of claim 1, further comprising:

using as one of the plurality of devices a filer.

7. The method of claim 1, further comprising:

using as one of the plurality of devices a disk.

8. A network storage system comprising:

one or more switches having a plurality of ports, each switch having a memory associated with the port;

a plurality of file servers interconnected with the one or more switches;

a plurality of disks, each disk of the plurality of disks connected to at least one of the one or more switches; and

a fabric management layer configured to include in the set of data identification of one or more disks that are offline and inaccessible to any of the plurality of devices and further configured to include in the set of data a disk identification string for each disk, the disk identification string indicating a name of a switch, a port number on the switch, and a disk number.

9. The network storage system of claim 8, wherein the set of data further comprises:

a unique identification of one of the devices; and

an address of the one of the devices.

10. The network storage system of claim 9, wherein the unique identification of one of the devices further comprises an unique serial number.

11. The network storage system of claim 9, wherein the address further comprises a fully qualified network address.

12. The network storage system of claim 8, wherein the plurality of switches comprise fibre channel switches operatively interconnected to define a switching fabric.

13. The network storage system of claim 8, wherein the memory associated with the port further comprises a Symbolic Port Name field.

14. The network storage system of claim 8, wherein one of the plurality of devices is a filer.

15. The network storage system of claim 8, wherein one of the plurality of devices a disk.

16. A computer-readable medium, including program instructions executing on a file server, for storing and distributing data in a network storage system, the program instructions performing comprising:

writing, by one of a plurality of devices, a set of data to a memory associated with a port of a switch, the memory being readable by all of the plurality of devices;

reading, by one of the plurality of devices, the set of data from the memory;

including in the set of data identification of one or more disks that are offline and inaccessible to any of the plurality of devices; and

including in the set of data a disk identification string for each disk, the disk identification string indicating a name of a switch, a port number on the switch, and a disk number.

17. A method for storing and distributing data in a network storage system having a plurality of devices interconnected with a switch, the method comprising:

writing, by a first one of the plurality of devices, a set of data into a port memory associated with a port of the switch;

including in the set of data a disk identification string, the disk identification string indicating a name of a switch, a port number on the switch, a disk number, and a status of the disk; and

reading by a second one of the plurality of devices the set of data from the port memory to determine the status of the disk.

18. The method of claim 17, wherein the plurality of devices comprises:

a plurality of filers.

19. The method of claim 18, further comprising:

reading, by a second filer of the plurality of filers when a first filer goes offline and in response to the disk identification string written by the first filer, the disks accessed by the first filer.

20. The method of claim 19, further comprising:

determining, by a filer of the plurality of filers, if a disk has gone offline.

21. The method of claim 17, further comprising:

writing disk identification information into the port memory upon boot-up of a device of the plurality of devices, and the port memory accessible to being read by a processor in the switch.

22. An apparatus for storing and distributing data in a network storage system having a plurality of devices interconnected with a switch, the method comprising:

means for writing, by a first one of the plurality of devices, a set of data into a port memory associated with a port of the switch;

means for including in the set of data a disk identification string, the disk identification string indicating a name of a switch, a port number on the switch, a disk number, and a status of the disk; and

means for reading by a second one of the plurality of devices the set of data from the port memory to determine the status of the disk.

23. The apparatus of claim 22, wherein the plurality of devices comprises:

a plurality of filers.

24. The apparatus of claim 23, further comprising:

means for reading, by a second filer of the plurality of filers when a first filer goes offline and in response to the disk identification string written by the first filer, the disks accessed by the first filer.

25. The apparatus of claim 23, further comprising:

means for determining, by a filer of the plurality of filers, if a disk has gone offline.

26. The apparatus of claim 22, further comprising:

means for writing disk identification information into the port memory upon boot-up of a device of the plurality of devices, and the port memory accessible to being read by a processor in the switch.

27. A computer readable media, comprising:

said computer readable media containing instructions for execution on a processor for the practice of a method for operating a plurality of devices interconnected with a switch, comprising;

writing, by a first one of the plurality of devices, a set of data into a port memory associated with a port of the switch; and

including in the set of data a disk identification string, the disk identification string indicating a name of a switch, a port number on the switch, a disk number, and a status of the disk; and

reading by a second one of the plurality of devices the set of data from the port 11 memory to determine the status of the disk.