Configuring Active and Passive Cluster Nodes

Active nodes process application requests and provide client services. Passive nodes are backup nodes that ensure that client applications and services are available if a hardware or software failure occurs. Cluster configurations may include both active and passive nodes.

NOTE: Passive nodes must be configured with appropriate processing power and storage capacity to support the resources that are running on the active nodes.

Your cluster solution supports variations of active/active (activex) and active/passive (activex/passivex) configurations. The variable x indicates the number of nodes that are active or passive.

Cluster solutions running the Windows operating system support active/active and active/passive configurations.

An active/active (activex) configuration contains virtual servers running separate applications or services on each node. When an application is running on node 1, the remaining node(s) do not have to wait for node 1 to fail. Those node(s) can run their own cluster-aware applications (or another instance of the same application) while providing failover for the resources on node 1. For example, multiway failover is an active/active failover solution because running applications from a failed node can migrate to multiple active nodes in the cluster. However, you must ensure that adequate resources are available on each node to handle the increased load if one node fails.

In an active/passive (activex/passivex) configuration, one or more active cluster nodes are processing requests for a clustered application while the passive cluster nodes only wait for the active node(s) to fail.

Failover and Failback

This section provides information about the failover and failback capabilities of the Cluster Service.

Failover

When an individual application or user resource (also known as a cluster resource) fails on a cluster node, the Cluster Service will detect the application failure and try to restart the application on the cluster node. If the restart attempt reaches a preset threshold, the Cluster Service brings the running application offline, moves the application and its resources to another cluster node, and restarts the application on the other cluster node(s). This process of automatically moving resources from a failed cluster node to other healthy cluster node(s) is called failover.

In order to fail over and fail back running applications, cluster resources are placed together in a group so the Cluster Service can move the cluster resources as a combined unit. This process ensures that the failover and/or failback procedures transfer all of the user resources as transparently as possible.

Using MSCS

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Dell SE500W manual Configuring Active and Passive Cluster Nodes, Failover and Failback

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