Monitor Persistent Volume Claim (PVC) utilization in OpenShift

Environment

• Red Hat OpenShift Container Platform (RHOCP)
  • 3
  • 4

Issue

• Is there a way to monitor Persistent Volume Claim (PVC) utilization
• PV and PVC usage metrics

Resolution

Prometheus was introduced as TP (Technical Preview) in RHOCP 3.7 and Storage metrics in RHOCP 3.9. Since 3.11 Prometheus is GA .

• The main metrics available to be used is kubelet_volume_stats_used_bytes and kubelet_volume_stats_available_bytes for both RHOCP 3 and RHOCP 4.3+.
  • For OCS and all the available metrics refer to documentation session OCS 3.11 - Enable Volume metrics

RHOCP 4 Notes

Starting with OpenShift Container Platform 4.3, the kubelet does extract this information from the respective CSI driver and exposes it accordingly.

• If using CSI driver, make sure that it is being used the official Red Hat as documented in - Using Container Storage Interface (CSI) .

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