Physical Network Interface Selection to Minimize Contention with Operating System Critical Storage Operations

• US 20080288620A1
• Filed: 05/18/2007
• Published: 11/20/2008
• Est. Priority Date: 05/18/2007
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Goff, Mark Harrison, Nelson, Randall Scott, Migliacio, Michael Anthony, Thiemann, Eric Gene
• Granted Patent: US 8,775,587 B2
• Time in Patent Office: Days
• US Class Current: 709/223
• CPC Class Codes: G06F 11/2007 using redundant communication media
• CPC Class Codes: G06F 3/061 Improving I/O performance
• 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 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

An apparatus, program product and method dynamically select a physical network interface for use by an application running on a networked computer in a manner that attempts to minimize bandwidth contention between application-related operations and any operating system critical storage operations that may be initiated by an operating system resident on the same networked computer. The dynamic selection prioritizes at least one physical network interface that does not handle operating system critical storage operations over at least one physical network interface that does handle operating system critical storage operations, thus minimizing the likelihood of the application causing poor performance and/or failure of the operating system due to contention over limited network resources.

Claims

1. An apparatus, comprising:

a network;

a network-accessible storage device coupled to the network and storing operating system data; and

a diskless computer coupled to the network, the diskless computer comprising;

a plurality of physical network adapters coupled to the network, a first physical network adapter among the plurality of physical network adapters configured to handle operating system critical storage operations; and

a processing unit coupled to the plurality of physical network adapters and configured to host the operating system and at least one application, wherein the processing unit is configured to direct operating system critical storage operations for the operating system over the first physical network adapter, and wherein the processing unit is further configured to dynamically select a physical network adapter from among the plurality of physical network interfaces to communicate network data for the application by attempting to use the first physical network adapter to communicate the network data for the application only if no other physical network adapter among the plurality of physical network adapters is available to communicate the network data for the application as a result of the first physical network interface being configured to handle operating system critical storage operations.

2. An apparatus, comprising:

a plurality of physical network interfaces, each physical network interface configured to communicate data over at least one network; and

a processing unit coupled to the plurality of physical network interfaces and configured to host an operating system and at least one application, wherein the processing unit is configured to direct operating system critical storage operations for the operating system over at least one of the plurality of physical network interfaces to access a network-accessible storage device, and wherein the processing unit is further configured to dynamically select at least one of the plurality of physical network interfaces to communicate network data for the application by prioritizing at least one physical network interface that does not handle operating system critical storage operations over at least one physical network interface that does handle operating system critical storage operations.

3. The apparatus of claim 2, wherein each of the physical network interfaces is disposed in a physical network adapter.

4. The apparatus of claim 2, wherein the plurality of physical network interfaces are coupled to a common network.

5. The apparatus of claim 4, wherein the plurality of physical network interfaces are coupled to an Ethernet network, and wherein the network data for the application is communicated via an Ethernet protocol.

6. The apparatus of claim 5, wherein the common network includes a storage area network to which the network-accessible storage device is coupled, and wherein the operating system critical storage operations are communicated via a network storage protocol that is different from a protocol by which the network data for the application is communicated.

7. The apparatus of claim 6, wherein the operating system critical storage operations are communicated via an iSCSI protocol.

8. The apparatus of claim 2, further comprising a diskless computer system within which the processing unit and the plurality of physical network interfaces are disposed.

9. The apparatus of claim 2, wherein the processing unit is configured to dynamically select at least one of the plurality of physical network interfaces to communicate network data for the application by prioritizing every physical network interface among the plurality of physical network interfaces that does not handle operating system critical storage operations over every physical network interface among the plurality of physical network interfaces that does handle operating system critical storage operations.

10. The apparatus of claim 2, wherein the processing unit is configured to generate an ordered list of physical network interfaces that the processing unit uses to dynamically select a physical network interface to communicate network data for the application, and wherein the processing unit is configured to prioritize a first physical network interface that does not handle operating system critical storage operations over a second physical network interface that does handle operating system critical storage operations by ordering the first physical network interface earlier in the ordered list than the second physical network interface.

11. The apparatus of claim 10, wherein the processing unit is configured to order the second physical network interface last in the ordered list as a result of the second physical network interface being configured to handle operating system critical storage operations.

12. The apparatus of claim 11, wherein the processing unit is further configured to configure the second physical network interface to handle operating system critical storage operations, and, in association with generating the ordered list, to determine that the second physical network interface is configured to handle operating system critical storage operations.

13. The apparatus of claim 10, wherein the processing unit is configured to dynamically select a physical network interface by sequentially attempting to use each physical network interface according to the ordered list.

14. The apparatus of claim 2, wherein the processing unit is configured to dynamically select a physical network interface in response to a request to communicate network data for the application.

15. The apparatus of claim 2, wherein the processing unit is configured to dynamically select a physical network interface in response to a request to link a virtual network adapter to a physical network interface.

16. The apparatus of claim 2, wherein the operating system critical storage operations include paging operations.

17. The apparatus of claim 2, wherein the network-accessible storage device is of the type upon which a system volume for the operating system resides, wherein the operating system critical storage operations include system volume storage operations.

18. A method of communicating data, the method comprising, in an apparatus of the type including a plurality of physical network interfaces that are each configured to communicate data over at least one network and a processing unit coupled to the plurality of physical network interfaces and configured to host an operating system and at least one application:

directing operating system critical storage operations for the operating system over at least one of the plurality of physical network interfaces to access a network-accessible storage device; and

dynamically selecting at least one of the plurality of physical network interfaces to communicate network data for the application by prioritizing at least one physical network interface that does not handle operating system critical storage operations over at least one physical network interface that does handle operating system critical storage operations.

19. The method of claim 18, wherein the apparatus comprises a diskless computer system within which the processing unit and the plurality of physical network interfaces are disposed, wherein each of the physical network interfaces is disposed in a physical network adapter, wherein the plurality of physical network interfaces are coupled to a common Ethernet network that includes a storage area network to which the network-accessible storage device is coupled, and wherein the operating system critical storage operations are communicated via an iSCSI protocol.

20. The method of claim 18, wherein dynamically selecting at least one of the plurality of physical network interfaces to communicate network data for the application includes prioritizing every physical network interface among the plurality of physical network interfaces that does not handle operating system critical storage operations over every physical network interface among the plurality of physical network interfaces that does handle operating system critical storage operations.

21. The method of claim 18, further comprising generating an ordered list of physical network interfaces for use in dynamically selecting a physical network interface to communicate network data for the application, including ordering a physical network interface that handles operating system critical storage operations last in the ordered list, wherein dynamically selecting a physical network interface includes sequentially attempting to use each physical network interface according to the ordered list.

22. The method of claim 21, further comprising:

configuring the second physical network interface to handle operating system critical storage operations; and

in association with generating the ordered list, determining that the second physical network interface is configured to handle operating system critical storage operations.

23. The method of claim 18, wherein dynamically selecting a physical network interface is performed in response to at least one of a request to communicate network data for the application and a request to link a virtual network adapter to a physical network interface.

24. The method of claim 18, wherein the operating system critical storage operations include at least one of paging operations and system volume storage operations directed to a system volume for the operating system that resides on the network-accessible storage device.

25. A program product, comprising:

program code configured to be executed in an apparatus of the type including a plurality of physical network interfaces that are each configured to communicate data over at least one network and a processing unit coupled to the plurality of physical network interfaces and configured to host an operating system and at least one application, and to direct operating system critical storage operations for the operating system over at least one of the plurality of physical network interfaces to access a network-accessible storage device, the program code configured to dynamically select at least one of the plurality of physical network interfaces to communicate network data for the application by prioritizing at least one physical network interface that does not handle operating system critical storage operations over at least one physical network interface that does handle operating system critical storage operations; and

a computer readable medium bearing the program code.