Use Cluster Health Monitor to collect diagnostic data to analyze performance degradation or failures of critical operating system resources.

• Understanding Cluster Health Monitor Services
  Cluster Health Monitor uses system monitor (osysmond) and cluster logger (ologgerd) services to collect diagnostic data.
• Collecting Cluster Health Monitor Data
  Collect Cluster Health Monitor data from any node in the cluster.
• Using Cluster Health Monitor from Enterprise Manager Cloud Control
  Histograms presented in real-time and historical modes enable you to understand precisely what was happening at the time of degradation or failure.