Active link verification for failover operations in a storage network

• US 8,918,670 B2
• Filed: 10/29/2008
• Issued: 12/23/2014
• Est. Priority Date: 10/29/2008
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Wakelin, Duncan
• Primary Examiner(s): DUNCAN, MARC M
• Application Number:
  US12/260,609
• Publication Number:
  US 20100107000A1
• Time in Patent Office: 2,246 Days
• Field of Search: 714/43, 714/4
• US Class Current: 714/4.11
• CPC Class Codes: G06F 11/201 between storage system components
• CPC Class Codes: H04L 41/0654 using network fault recovery ring fault isolation or reconfiguration in loop networks without recovery actions by a network management system H04L12/437
• 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

Systems and methods for active link verification for failover operations in a storage network are disclosed. An exemplary method includes issuing a command from a first port of a storage device to a local network device in the storage network. The method also includes receiving a response to the command at the first port of the storage device from the local network device in the storage network. The storage device fails over to a second port of the storage device if no response is received at the first port of the storage device.

Claims

1. A method for active link verification for failover operations in a storage network, comprising:

issuing a command from a first port of a storage device to a local network device in the storage network, the local network device being one connection away from the first port of the storage device;

receiving a response to the command at the first port of the storage device from the local network device in the storage network, wherein the storage device fails over to a second port of the storage device if no response is received at the first port of the storage device; and

preventing failover due to at least one of the following;

a local link failure at a client computing device, an overloaded client computing device, and an operating system and/or application failure at a client computing device.

2. The method of claim 1 further comprising:

issuing a second command from the first port of the storage device to a non-local network device, the non-local network device being more than one connection away from the first port of the storage device; and

receiving a second response to the second command at the first port of the storage device from the non-local network device in the storage network, wherein the storage device fails over to a second port of the storage device if no response to both commands is received at the first port of the storage device.

3. The method of claim 1, further comprising restricting issuing the command from the first port of the storage device to network links that the first port is configured and connected to.

4. The method of claim 1, further comprising issuing the command from the first port of the storage device to different tiers of network devices.

5. A storage device configurable for operation with a local network device in a storage network, the storage device comprising:

at least a first port and a second port; and

program code executable at the storage device to cause;

issuing a command from the first port to the local network device in the storage network, the local network device being one connection away from the first port of the storage device;

failing over to the second port if no response is received to the command issued at the first port; and

preventing failover due to at least one of the following;

a local link failure at a client computing device, an overloaded client computing device, and an operating system and/or application failure at a client computing device.

6. The storage device of claim 5, wherein the program code executable at the storage device further causes:

issuing a second command from the first port of the storage device to a non-local switch, the non-local network device being more than one connection away from the first port of the storage device; and

receiving a second response to the second command at the first port of the storage device from the non-local network device in the storage network.

7. The storage device of claim 6, wherein communication fails over to the second port if no response to both commands is received at the first port.

8. The storage device of claim 6, wherein the first and second commands are heartbeat commands.

9. The storage device of claim 6, wherein the first and second commands are link service commands.

10. The storage device of claim 6, wherein the local and non-local network devices are network switches.

11. The storage device of claim 5, wherein the program code reduces unnecessary failover due to a condition at a client computing device.

12. The storage device of claim 5, wherein the second port is available to a client computing device in a failover mode.

13. The storage device of claim 5, wherein the program code is restricted to issuing the command from the first port of the storage device to network links that the first port is configured and connected to.

14. The storage device of claim 5, wherein the program code issuing the command from the first port of the storage device, issues the command to different tiers of network devices.

15. A system for active link verification for failover operations in a storage network, comprising:

means for issuing a heartbeat command from a first port of a storage device; and

means for receiving a response to the heartbeat command at the first port of the storage device from a local network device in the storage network, the local network device being one connection away from the first port of the storage device, wherein the storage device fails over to a second port of the storage device if no response is received at the first port of the storage device; and

means for preventing failover due to at least one of the following;

a local link failure at a client computing device, an overloaded client computing device, and an operating system and/or application failure at a client computing device.

16. The system of claim 15 further comprising:

means for issuing a second heartbeat command from the first port of the storage device; and

means for receiving a second response to the second heartbeat command at the first port of the storage device from a non-local network device in the storage network, the non-local network device being more than one connection away from the first port of the storage device, wherein the storage device enters a failover mode if no response to the heartbeat commands is received at the first port of the storage device.

17. The system of claim 15, wherein the means for issuing the heartbeat command from the first port of the storage device, issues the heartbeat command to different tiers of network devices.