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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            AGEstandard (default)   kubernetes.io/gce-pd   98d

2. Describe the StorageClass namedstandard. Note that itstype ispd-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 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: kubernetes.io/gce-pdparameters:  type: pd-ssd  replication-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            AGE  apigee-sc (default)  kubernetes.io/gce-pd   1d  standard             kubernetes.io/gce-pd   98d