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State recovery and failover of intelligent network adapters

A fault repair and adapter technology, applied in the direction of instruments, digital transmission systems, error prevention, etc., can solve problems such as performance bottlenecks

Inactive Publication Date: 2006-02-22
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this synchronization can become a performance bottleneck at higher speeds, because to ensure correctness, some protocol events must be spot-checked as soon as they occur (i.e., be synchronized between the active and standby network offload engines). or sync)

Method used

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  • State recovery and failover of intelligent network adapters
  • State recovery and failover of intelligent network adapters
  • State recovery and failover of intelligent network adapters

Examples

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Embodiment Construction

[0024] Referring now to the drawings, Figure 1 shows a pictorial representation of a network of data processing systems in which the present invention may be implemented. Network data processing system 100 is a network of computers in which the present invention may be implemented. Network data processing system 100 includes network 102 , which is the medium used to provide communication links between various devices and computers connected together within network data processing system 100 . Network 102 may include connections such as wire, wireless communication links, or fiber optic cables.

[0025] In the example shown, server 104 is connected to network 102 along with storage unit 106 . Additionally, clients 108 , 110 , and 112 are connected to network 102 . These clients 108, 110 and 112 may be, for example, personal computers or network computers. In the example shown, server 104 provides data such as boot files, operating system images, and applications to clients 1...

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Abstract

The present invention provides a method, computer program product, and data processing system for efficiently recovering state and performing failover of a network offload engine. The present invention distinguishes between the hard state and the soft state of a protocol. Hard state is state information that, when lost, leads to incorrect protocol behavior. Soft state is state information that may be lost or become inconsistent without loss of correctness. The present invention ensures correctness by always being able to recover the hard state of the protocol. A preferred embodiment of the present invention performs a failover of a network offload engine by temporarily blocking the reception of network packets, recovering hard state from host information, resuming network operation using a substitute network offload engine, and recovering soft state from the subsequent network activity.

Description

[0001] Cross References to Related Applications [0002] This application is related to a commonly assigned co-pending application entitled "REMOTE DIRECTMEMORY ACCESS ENABLED NETWORK INTERFACECONTROLLER SWITCHOVER AND SWITCHBACK SUPPORT" filed September 5, 2002 US Patent Application Serial No. 10 / 235,691, which application is incorporated herein by reference. technical field [0003] The present invention generally relates to intelligent network adapters. Specifically, the present invention relates to state restoration and fault recovery of network offload engines. Background technique [0004] In Internet Protocol (IP) networks, software provides a messaging mechanism that can be used to communicate with input / output devices, general-purpose computers (hosts), and special-purpose computers. IP networks generally use so-called "protocol stacks" to encapsulate and transport data using a series of protocols. A typical protocol stack following the Open Systems Interconnecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/00H04B1/74H04L69/40
CPCH04L69/16H04L1/1874H04L29/06081H04L69/40H04L29/06102H04L29/14H04L69/163H04B1/74H04L1/1835H04L29/06095H04L69/161H04L1/1809H04L69/12H04L29/06115
Inventor 道格拉斯·弗雷穆斯罗纳德·姆拉兹埃里奇·纳哈姆普拉善特·普拉德翰萨姆比特·撒胡约翰·特拉斯
Owner IBM CORP
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