System and method for failover using virtual ports in clustered systems

• US 7,467,191 B1
• Filed: 09/26/2003
• Issued: 12/16/2008
• Est. Priority Date: 09/26/2003
• Status: Active Grant

• Current Assignee: NetApp, Inc.
• Original Assignee: Network Appliance Incorporated (NetApp, Inc.)
• Inventors: Lee, Herman, Wang, Fang
• Primary Examiner(s): Pwu; Jeffrey
• Assistant Examiner(s): Bruckart; Benjamin R
• Application Number:
  US10/672,260
• Time in Patent Office: 1,908 Days
• Field of Search: 709/223, 709/221, 709/229
• US Class Current: 709/221
• CPC Class Codes: G06F 11/20 using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
• CPC Class Codes: G06F 11/2092 Techniques of failing over between control units
• CPC Class Codes: G06F 3/0604 Improving or facilitating administration, e.g. storage management
• CPC Class Codes: G06F 3/0617 in relation to availability
• CPC Class Codes: G06F 3/0664 at device level, e.g. emulation of a storage device or system
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD
• CPC Class Codes: H04L 41/00 Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
• 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]
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06

Abstract

A system and method for utilizing virtual ports associated with a physical port in a Fibre Channel adapter for use in a clustered storage system is disclosed. A plurality of virtual ports are created and associated with a physical port on a storage system. One of the virtual ports is utilized as a standby port to be used to assume the identity of a port associated with a failed storage system in the cluster. In the event of a failover operation, the standby port is activated and assumes the identity of the failed storage systems port. Data access requests previously directed to the failed storage system are received by the activated virtual port and processed by the surviving storage system.

Claims

1. A method, comprising:

detecting a failure of a primary virtual port on a physical port of a first server, wherein the primary virtual port has an identity;

activating a secondary virtual port on the physical port of the first server, the physical port configured to support two or more virtual ports that share the physical port;

configuring the secondary virtual port with the identity of the failed primary virtual port by setting a node name of the secondary virtual port to a node name of the primary virtual port, wherein the node name is unique to the first server, and setting a port name of the secondary virtual port to a port name of the primary virtual port; and

servicing one or more storage devices owned by the first server through the secondary virtual port on the first server.

2. The method of claim 1, wherein detecting the failure is in response to initiating a failover procedure during a scheduled maintenance on the first server.

3. The method of claim 1, wherein detecting a failure in the first server further comprises:

detecting a lack of a heartbeat signal from the first server at a second server.

4. The method of claim 1, further comprising:

determining that the primary virtual port has been recovered;

terminating service requests to the secondary virtual port;

deactivating the secondary virtual port; and

servicing the storage devices owned by the first server through the primary virtual port.

5. The method of claim 1 wherein the storage network comprises a Fibre Channel (FC) network and wherein the node name comprises a FC World Wide Node Name.

6. The method of claim 1 further comprising processing, by the first server, data access requests directed to the secondary virtual port.

7. The method of claim 6 further comprising processing, by the first server, data access requests directed to a third virtual port, the third virtual port also associated with the physical port.

8. The method of claim 1, wherein the secondary virtual port is in standby mode prior to the failure on the primary virtual port.

9. A computer readable medium including program instructions when executed operable to:

detecting a failure of a primary virtual port on a physical port of a first server, wherein the primary virtual port has an identity;

activating a secondary virtual port on the physical port of the first server, the physical port configured to support two or more virtual ports that share the physical port;

configuring the secondary virtual port with the identity of the failed primary virtual port by setting a node name of the secondary virtual port to a node name of the primary virtual port, wherein the node name is unique to the first server, and setting a port name of the secondary virtual port to a port name of the primary virtual port; and

servicing one or more storage devices owned by the first server through the secondary virtual port on the first server.

10. The computer readable medium of claim 9 wherein the storage network comprises a Fibre Channel (FC) network and wherein the node name comprises a FC World Wide Node Name.

11. The computer readable medium of claim 9 further comprising processing, by the first server, data access requests directed to the secondary virtual port.

12. The computer readable medium of claim 11 further comprising processing, by the storage server, data access requests directed to a third virtual port, the third virtual port is associated with the physical port.

13. The computer readable medium of claim 9, wherein the secondary virtual port is in standby mode prior to the failure on the primary virtual port.

14. A storage server, comprising

a physical port configured to communicate with a client over a network;

a plurality virtual ports associated with the physical port, wherein there is at least one primary virtual port and a secondary virtual port; and

a storage operating system executed by a processor, the processor configured to;

(i) detect a failure in the primary virtual port, the primary virtual port having an identity, (ii) in response to detecting the failure, activate the secondary virtual port, (iii) configure the secondary virtual port with the identity of the failed primary virtual port by setting a node name of the secondary virtual port to a node name of the primary virtual port, wherein the node name is unique to the first server, and setting a port name of the secondary virtual port to a port name of the primary virtual port, and (iv) service one or more storage devices owned by the storage server through the secondary virtual port on the storage server.

15. The storage server of claim 14, wherein the secondary virtual port is in standby mode prior to the failure on the primary virtual port.