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The Cassandra database uses dynamically created persistent volumes to store data. For proper database functioning, Apigee requires you to configure aStorageClass definition that is backed by a solid-state drive (SSD).

If you do not currently have SSD configured for Cassandra, 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: Apigee requires the use of SSD for Cassandra.

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                   15h    standard                kubernetes.io/gce-pd    Delete          Immediate              true                   15hstandard-rwo (default)  pd.csi.storage.gke.io   Delete          WaitForFirstConsumer   true                   15h

2. Describe the StorageClass namedstandard-rwo. Note that itstype ispd-balanced:

   kubectl describe sc standard-rwo

   For example:

   kubectl describe sc standard-rwo

   Name:                  standard-rwoIsDefaultClass:        YesAnnotations:           components.gke.io/layer=addon,storageclass.kubernetes.io/is-default-class=falseProvisioner:           pd.csi.storage.gke.ioParameters:            type=pd-balancedAllowVolumeExpansion:  TrueMountOptions:          <none>ReclaimPolicy:         DeleteVolumeBindingMode:     WaitForFirstConsumerEvents:                <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-rwo \  -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   AGEapigee-sc (default)   kubernetes.io/gce-pd    Delete          WaitForFirstConsumer   true                   14h    premium-rwo           pd.csi.storage.gke.io   Delete          WaitForFirstConsumer   true                   15h    standard              kubernetes.io/gce-pd    Delete          Immediate              true                   15h    standard-rwo          pd.csi.storage.gke.io   Delete          WaitForFirstConsumer   true                   15h