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DIGITAL Server Cluster Kits for Windows NT Configuration Guide
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Using ServerWORKS Manager with Clusters
A cluster provides high availability of services to the network. Typically, a cluster consists of two servers
that are similarly configured with resources like applications, databases, and hardware components. When
a server on which the resource groups reside is unavailable, another cluster continues to provide the
resources. Reasons for unavailability include downtime for scheduled maintenance and backup or
component failure of a resource, for example, a server goes down.
You must configure a cluster based on the operating system instructions.
Note: DCNT and MSCS may use different configuration methods and terminology. When a cluster is
operating, the server controlling a resource group is referred to as the controlling cluster. When
the ownership of a group moves from one node to another, the action is called failover. If the
ownership returns to the first server that was providing control of the resource group, the action
is called failback.
Discovering Clusters
IP Discovery finds DCNT and MSCS clusters on your network. You can set up cluster members to send
SNMP traps when a cluster group fails over. The message indicates a transition of control from one
cluster member to another. You can view the details about a cluster member using the System Browser.
See Figure 1-1.
Figure 1-1 Discovered Clusters on a Map View