You can add a cluster to Performance Manager to monitor the cluster and obtain information about its status and configuration.
You cannot add the same cluster to more than one instance of Performance Manager. When you attempt to add a cluster that a Performance Manager instance is already monitoring, a warning message is displayed in the GUI. Each cluster in a MetroCluster configuration must be added separately.
A single instance of Performance Manager supports a specific number of clusters and volumes. If Performance Manager is monitoring an environment that exceeds the supported configuration, you might have difficulty collecting and analyzing configuration and performance data from the cluster. See the OnCommand Performance Manager Release Notes for the number of clusters, nodes, and volumes that Performance Manager can reliably support.