StorageClass configuration

For the Cassandra database, hybrid runtime uses dynamically created persistent volumes to store data. To configure Cassandra properly, you must configure a StorageClass definition that is backed by a solid-state drive (SSD).

This topic explains how to create a new StorageClass that uses SSD and make it the default class. When Cassandra starts, it will use this default StorageClass.

Change the default StorageClass

The following steps explain how to create a StorageClass and make it the default class. For more information, see Change the default storage class in the Kubernetes documentation.

  1. Get the name of the current default StorageClass: 
    kubectl get sc

    For example: 

    kubectl get sc NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE premium-rwo pd.csi.storage.gke.io Delete WaitForFirstConsumer true 40m standard (default) kubernetes.io/gce-pd Delete Immediate true 40m standard-two pd.csi.storage.gke.io Delete WaitForFirstConsumer true 40m
  2. Describe the StorageClass named standard. Note that its type is pd-standard: 
    kubectl describe sc standard

    For example: 

    kubectl describe sc standard  Name: standard  IsDefaultClass: Yes  Annotations: storageclass.beta.kubernetes.io/is-default-class=true  Provisioner: kubernetes.io/gce-pd  Parameters: type=pd-standard  AllowVolumeExpansion: <unset>  MountOptions: <none>  ReclaimPolicy: Delete  VolumeBindingMode: Immediate  Events: <none>
  3. Create a new file called storageclass.yaml.
  4. Add this code to the file. Note that the name of the new class is apigee-sc. You can use any name you like. Also, note that the storage type is pd-ssd: 
    --- kind: StorageClass apiVersion: storage.k8s.io/v1 metadata:  name: "apigee-sc" provisioner: pd.csi.storage.gke.io parameters:  type: pd-ssd  replication-type: none volumeBindingMode: WaitForFirstConsumer allowVolumeExpansion: true
  5. Apply the new StorageClass to your Kubernetes cluster: 
    kubectl apply -f storageclass.yaml
  6. Execute the following two commands to change the default StorageClass: 
    kubectl patch storageclass standard \ -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'
     
    kubectl patch storageclass apigee-sc \ -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
  7. Execute this command to verify that the new default StorageClass is called apigee-sc: 
    kubectl get sc

    For example: 

    kubectl get sc NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE apigee-sc (default) pd.csi.storage.gke.io Delete WaitForFirstConsumer true 67s premium-rwo pd.csi.storage.gke.io Delete WaitForFirstConsumer true 49m standard kubernetes.io/gce-pd Delete Immediate true 49m standard-rwo pd.csi.storage.gke.io Delete WaitForFirstConsumer true 49m