Failover Cluster Networks Test

A network (sometimes called an interconnect) performs one of the following roles in a cluster:

  • A private network carries internal cluster communication. The Cluster service authenticates all internal communication, but administrators who are particularly concerned about security can restrict internal communication to physically secure networks.
  • A public network provides client systems with access to cluster application services. IP Address resources are created on networks that provide clients with access to cluster services.
  • A mixed (public-and-private) network carries internal cluster communication and connects client systems to cluster application services.

A network that is not enabled for use by the cluster (that is, neither public nor private) carries traffic unrelated to cluster operation.

Regardless of the role that a network performs, its availability is critical to the smooth functioning of the cluster, as without the network, communication between cluster nodes and between clients and cluster nodes become impossible. This is why, if a client complains of service/resource inaccessibility, administrators must check the status of the cluster networks to figure out if a down network is what is denying end-users access. This is where the Failover Cluster Networks testhelps.

Using this test, administrators can determine  which cluster network is up and which is down, so that they can ascertain what type of cluster communication is impacted – internal communication between the cluster nodes? Communication between the client and the cluster services/applications? Or both?

Target of the test : A node in a Windows cluster

Agent deploying the test : An internal agent

Outputs of the test : One set of results for each cluster network configured for every cluster created

Configurable parameters for the test
  1. TEST PERIOD – How often should the test be executed
  2. Host - The host for which the test is to be configured.
  3. port – The port at which the specified HOST listens. By default, this is Null.
Measurements made by the test
Measurement Description Measurement Unit Interpretation

Cluster network status:

Indicates the current state of this cluster network.

 

The values that this measure can report and the states they indicate have been listed in the table below:

State Numeric value
Up 100
Partitioned 70
Down 50
Unavailable 30
Unknown 10

Note:

By default, this measure can report the States mentioned above while indicating the current state of each cluster network. However, the graph of this measure is indicated using the numeric equivalents.