Monitor Volume Health in a TKG Cluster

You can check health status of a persistent volume in a bound state.

For each persistent volume in a bound state, the health status appears in the Annotations: volumehealth.storage.kubernetes.io/messages: field of the persistent volume claim bound to the persistent volume. Two possible values for health status exist.

Health Status	Description
Accessible	The persistent volume is accessible and available for use.
Inaccessible	The persistent volume is inaccessible and cannot be used. The persistent volume becomes inaccessible if the datastore that stores the volume cannot be reached by the hosts that connect to the datastore.

Procedure

Access your namespace in the vSphere Kubernetes environment.
Create a persistent volume claim.
1. Create a YAML file that contains the persistent volume claim configuration.
```
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: my-pvc
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: gold
  resources:
    requests:
        storage: 2Gi
           
```
2. Apply the persistent volume claim to the Kubernetes cluster.
```
kubectl apply -f pvc_name.yaml
```
  This command creates a Kubernetes persistent volume and a vSphere volume with a backing virtual disk that satisfies the claim's storage requirements.
3. Check whether the persistent volume claim is bound to a volume.
```
kubectl get pvc my-pvc
```
  The output shows that the persistent volume claim and the volume are in the bound state.
```
NAME     STATUS    VOLUME   CAPACITY   ACCESSMODES   STORAGECLASS   AGE
my-pvc   Bound     my-pvc   2Gi        RWO           gold           30s
```

Check the health status of the volume.

Run the following command to check the volume health annotation of the persistent volume claim bound to the persistent volume.

kubectl describe pvc my-pvc

In the following sample output, the volumehealth.storage.kubernetes.io/messages field shows the health status as accessible.

Name:          my-pvc
Namespace:     test-ns
StorageClass:  gold
Status:        Bound
Volume:        my-pvc
Labels:        <none>
Annotations:   pv.kubernetes.io/bind-completed: yes
               pv.kubernetes.io/bound-by-controller: yes
               volume.beta.kubernetes.io/storage-provisioner: csi.vsphere.vmware.com
               volumehealth.storage.kubernetes.io/messages: accessible
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      2Gi
Access Modes:  RWO
VolumeMode:    Filesystem