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Cluster Service (System Services for the Windows Server 2003 Family and Windows XP Operating Systems)

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Service Name: ClusSvc

Executable Name: Clussvc.exe

Log On As: Domain account specified when cluster service is configured

Description: Server clusters provide high availability and scalability for mission-critical applications such as databases, messaging systems, and file and print services. If one of the nodes in a cluster becomes unavailable either due to planned downtime for maintenance or unplanned downtime due to failure of a node, the operating system or an application, another node takes over to provide the service to the end-user—a process known as failover. When failover occurs, users who are accessing the cluster service continue to access the service, and are unaware that it is now being provided from a different server (node).

Supports for up to 8-node server clusters in both Enterprise Server and Datacenter Server, however, a cluster cannot be made up of nodes running both Windows Server 2003 Enterprise Server and Windows Datacenter Server, they must all be running either Enterprise server or Datacenter server. A server cluster can be operated with some nodes running Windows 2000 and others running Windows Server as part of a rolling upgrade scenario.

Server clusters can be set up as one of three different configurations:

  • Single node server clusters can be configured with, or without, external cluster storage devices. For single node clusters without an external cluster storage device, the local disk is configured as the cluster storage device. Single node configurations can be used to develop cluster aware applications or can be used in production to provide the local health monitoring and restart capabilities to applications.

  • Single quorum device server clusters have two or more nodes and are configured so that every node is attached to one or more cluster storage devices. The cluster configuration data is stored on a single cluster storage device known as the quorum disk.

  • Majority node set server clusters have two or more nodes where the nodes may or may not be attached to one or more cluster storage devices. The cluster configuration data is stored on multiple disks across the cluster and the Cluster service makes sure that this data is kept consistent across the different disks.

If this service is stopped or disabled, the cluster service itself and any applications or services hosted by the cluster service will be stopped.

Available on: Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition.

Installed through: Default operating system installation

Startup type: Automatic

Service status: Not started until the first node of a cluster is configured.

This service depends on the following system components:

Network Connections

Remote Procedure Call

Windows Time

Network Cluster Driver

The following system components depend on this service: None

IP Port Numbers used:

TCP: 3343

UDP: 1204, 1094, 2036, 2008, 3343

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