The Microsoft Cluster Service (MSCS) connects two or more servers together so that they appear as a single computer to clients. Clustering helps you to have a fail-safe application. A cluster-aware application like Microsoft SQL Server runs on a node at a time. If that node goes down, some other node takes over the service. Clustering also helps in making sure that your application is up all the time.
Performance monitoring requires remote access to clusters and individual cluster nodes for metric collection such as CPU and memory use. The cluster-specific information is available on each node. The MSCS AIM uses WMI (port 135) to communicate with clusters.
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