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Cluster system and method for backing up a replica in a cluster system

A backup copy, cluster system technology, applied in transmission systems, digital transmission systems, special data processing applications, etc., can solve problems such as large recovery time overhead

Inactive Publication Date: 2008-03-05
INT BUSINESS MASCH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, significant recovery time overhead is incurred in case of primary replica failure

Method used

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  • Cluster system and method for backing up a replica in a cluster system
  • Cluster system and method for backing up a replica in a cluster system
  • Cluster system and method for backing up a replica in a cluster system

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Embodiment Construction

[0026] Figure 1 shows one example of a clustered computer system 10 having one or more clients 12a-12n, communication systems 13 and 14, nodes 16a-16n, disk bus 18, and one or more shared disks 20a-20n. It should be understood that the system 10 described is only an example, and that other clusters that may be used with the present invention may appear very different depending on the number of processors, choice of network and disk technology used, and the like. It should be understood that client 12 is a processor that can access node 16 through a local area network such as a public LAN shown at 13 or a private LAN shown at 14 . Each client 12 runs a “front end” or client application that interrogates a server application running on a cluster node 16 . It should also be understood that in the system of FIG. 1 , each node 16 has access to one or more shared external disk devices 20 . Each disk device 20 may be physically connected to multiple nodes. The shared disk 20 stores...

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Abstract

A method, system and program product for backing up a replica in a cluster system having at least one client, at least one node, a primary replica, a secondary replica, and a secondary-backup (S-backup) replica each replicating a process running on the cluster system. A hierarchy is assigned to each of the primary, secondary and S-backup replicas. The failure of one of the replicas is detected and the failing replica is replaced with one of lower hierarchy. The replica having the lowest affected hierarchy is regenerated to reestablish the primary replica, secondary replica, and S-backup replica.

Description

technical field [0001] The present invention relates to replication of components of a clustered computer system, and more particularly to backup replication of secondary copies for backing up components of a clustered computer system. Background technique [0002] A major inherent problem in clustered systems is their potential vulnerability to failure. When a single node in the cluster crashes, the availability of the entire system may be jeopardized. Redundancy to increase system reliability is usually introduced into the system through duplication of components. A service or process in a replicated distributed system requires that each copy of the service maintain a consistent state. This consistency is ensured by a specific replication protocol. There are different ways to organize process replicas, and a distinction is generally made between active, passive and semi-active replication. [0003] In the active replication technique, also known as a state machine appr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/22H04L12/56G06F15/173G06F17/30
CPCG06F11/2023G06F11/1482G06F11/2041G06F11/2097
Inventor P·A·布阿
Owner INT BUSINESS MASCH CORP
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