# US 7,412,479 B2 · Highly scalable and highly available cluster system management scheme

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- Number: US 7,412,479 B2
- Document ID: US7412479B2
- Status: Granted
- Kind: B2
- Application number: 10/042,412
- Filed: 2002-01-07
- Published: 2002-07-11
- Granted: 2008-08-12
- Earliest claimed: 1998-07-10
- Assignees: International Business Machines Corporation
- Inventors: James W. Arendt; Ching-Yun Chao; Rodolfo Ausgusto Mancisidor
- Web page: https://patentgrep.com/patent/US7412479B2

## CPC

- G06F 9/5061: {Partitioning or combining of resources}
- G06F 11/1425: {by reconfiguration of node membership}
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A cluster system is treated as a set of resource groups, each resource group including an highly available application and the resources upon which it depends. A resource group may have between 2 and M data processing systems, where M is small relative to the cluster size N of the total cluster. Configuration and status information for the resource group is fully replicated only on those data processing systems which are members of the resource group. A configuration object/database record for the resource group has an associated owner list identifying the data processing systems which are members of the resource group and which may therefore manage the application. A data processing system may belong to more than one resource group, however, and configuration and status information for the data processing system is replicated to each data processing system which could be affected by failure of the subject data processing system—that is, any data processing system which belongs to at least one resource group also containing the subject data processing system. The partial replication scheme of the present invention allows resource groups to run in parallel, reduces the cost of data replication and access, is highly scalable and applicable to very large clusters, and provides better performance after a catastrophe such as a network partition.

## Claims

### Claim 1

A method of partially replicating configuration information in a distributed database, comprising:
defining a subset of data processing systems within a cluster system as a resource group, wherein a data processing system may be a member of more than one resource group;
defining configuration data for the resource group by instantiating a configuration object containing configuration and status information for a highly available application corresponding to the resource group and having an associated list of data processing systems within the resource group; and
replicating the configuration data only on each data processing system within the resource group.

### Claim 2 (depends on 1)

The method of claim 1, wherein the step of defining a subset of data processing systems within a cluster as a resource group further comprises:
defining a highly available application and each data processing system designated to manage the application as a resource group.

### Claim 3 (depends on 2)

The method of claim 2, wherein the step of defining a highly available application and each data processing system managing the application as a resource group further comprises:
defining a plurality of resource groups for each highly available application within the cluster, each resource group including all data processing systems managing the corresponding application.

### Claim 4 (depends on 1)

The method of claim 1, wherein the step of replicating the configuration data only on each data processing system within the resource group further comprises:
replicating the configuration object on each data processing system identified in an owners list associated with the configuration object.

### Claim 5 (depends on 1)

The method of claim 1, wherein the step of replicating the configuration data only on each data processing system within the resource group further comprises:
replicating, on a data processing system, a configuration object for each resource group including the data processing system.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
maintaining, on a data processing system, a configuration object for each resource group including the data processing system and no configuration objects for other resource groups.