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For the Cassandra database, hybrid runtime uses dynamically created persistent volumes to store data. To configure Cassandra properly, you must configure aStorageClass 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.

KEY POINT: For performance reasons, it is important that the StorageClass uses an SSD backend.

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 namedstandard. Note that itstype ispd-standard:

   kubectl describe sc standard

   For example:

   kubectldescribescstandardName:standardIsDefaultClass:YesAnnotations:storageclass.beta.kubernetes.io/is-default-class=trueProvisioner:kubernetes.io/gce-pdParameters:type=pd-standardAllowVolumeExpansion:<unset>MountOptions:<none>ReclaimPolicy:DeleteVolumeBindingMode:ImmediateEvents:<none>

3. Create a new file calledstorageclass.yaml.
4. Add this code to the file. Note that the name of the new class isapigee-sc. You can use any name you like. Also, note that the storage type ispd-ssd:

   ---kind:StorageClassapiVersion:storage.k8s.io/v1metadata:name:"apigee-sc"provisioner:pd.csi.storage.gke.ioparameters:type:pd-ssdreplication-type:nonevolumeBindingMode:WaitForFirstConsumerallowVolumeExpansion: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 calledapigee-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