The Cassandra database uses
dynamically created persistent volumes to store data. For proper database functioning,
Apigee requires you to configure a StorageClass
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.
The steps outlined in this topic for StorageClass configuration are only applicable to a new
Cassandra installation. If you already have a Cassandra class installed, you must decommission the existing
cluster in order to configure the StorageClass definition. Changes to the StorageClass definition of an
existing Cassandra cluster after installation are not supported.
Apigee recommends deploying hybrid in two or more regions,
in order to decommission and re-install one region
while preserving data in the secondary region. Alternatively, you can use a non-CSI hybrid backup to restore
data in a single-region installation, after decommissioning and configuring the required StorageClass definition.
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.
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 15h
standard-rwo (default) pd.csi.storage.gke.io Delete WaitForFirstConsumer true 15h
Describe the StorageClass named standard-rwo. Note that its
type is pd-balanced:
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:
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-29 UTC."],[],[],null,["# StorageClass configuration\n\n| You are currently viewing version 1.14 of the Apigee hybrid documentation. For more information, see [Supported versions](/apigee/docs/hybrid/supported-platforms#supported-versions).\n\n\nThe Cassandra database uses\n[dynamically created](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#dynamic) persistent volumes to store data. For proper database functioning,\nApigee requires you to configure a [StorageClass](https://kubernetes.io/docs/concepts/storage/storage-classes)\ndefinition that is backed by a solid-state drive (SSD).\n\n\nIf you do not currently have SSD configured for Cassandra, this topic explains how to create a\nnew StorageClass that uses SSD and make it the\ndefault class. When Cassandra starts, it will use this default StorageClass.\n| **KEY POINT:** Apigee requires the use of SSD for Cassandra.\n\nThe steps outlined in this topic for StorageClass configuration are only applicable to a *new*\nCassandra installation. If you already have a Cassandra class installed, you must decommission the existing\ncluster in order to configure the StorageClass definition. Changes to the StorageClass definition of an\nexisting Cassandra cluster after installation are not supported.\n\nApigee recommends deploying hybrid in [two or more regions](/apigee/docs/hybrid/v1.14/multi-region),\nin order to decommission and re-install one region\nwhile preserving data in the secondary region. Alternatively, you can use a [non-CSI hybrid backup](/apigee/docs/hybrid/v1.14/cassandra-backup-overview#how-to-take-backups) to restore\ndata in a single-region installation, after decommissioning and configuring the required StorageClass definition.\n\n\u003cbr /\u003e\n\nChange the default StorageClass\n-------------------------------\n\n\nThe following steps explain how to create a StorageClass and make it the default class. For more\ninformation, see [Change the default storage class](https://kubernetes.io/docs/tasks/administer-cluster/change-default-storage-class/) in the Kubernetes documentation.\n\n1. Get the name of the current default StorageClass: \n\n ```\n kubectl get sc\n ```\n\n\n For example: \n\n kubectl get sc\n NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE\n premium-rwo pd.csi.storage.gke.io Delete WaitForFirstConsumer true 15h\n standard kubernetes.io/gce-pd Delete Immediate true 15h\n standard-rwo (default) pd.csi.storage.gke.io Delete WaitForFirstConsumer true 15h\n \n2. Describe the StorageClass named `standard-rwo`. Note that its type is `pd-balanced`: \n\n ```\n kubectl describe sc standard-rwo\n ```\n\n\n For example: \n\n ```text\n kubectl describe sc standard-rwo\n ``` \n\n ```\n Name: standard-rwo\n IsDefaultClass: Yes\n Annotations: components.gke.io/layer=addon,storageclass.kubernetes.io/is-default-class=false\n Provisioner: pd.csi.storage.gke.io\n Parameters: type=pd-balanced\n AllowVolumeExpansion: True\n MountOptions: \u003cnone\u003e\n ReclaimPolicy: Delete\n VolumeBindingMode: WaitForFirstConsumer\n Events: \u003cnone\u003e\n ```\n3. Create a new file called `storageclass.yaml`.\n4. 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`: \n\n ```carbon\n ---\n kind: StorageClass\n apiVersion: storage.k8s.io/v1\n metadata:\n name: \"apigee-sc\"\n provisioner: pd.csi.storage.gke.io\n parameters:\n type: pd-ssd\n replication-type: none\n volumeBindingMode: WaitForFirstConsumer\n allowVolumeExpansion: true\n ```\n5. Apply the new StorageClass to your Kubernetes cluster: \n\n ```\n kubectl apply -f storageclass.yaml\n ```\n6. Execute the following two commands to change the default StorageClass: \n\n ```\n kubectl patch storageclass standard-rwo \\\n -p '{\"metadata\": {\"annotations\":{\"storageclass.kubernetes.io/is-default-class\":\"false\"}}}'\n ``` \n\n ```\n kubectl patch storageclass apigee-sc \\\n -p '{\"metadata\": {\"annotations\":{\"storageclass.kubernetes.io/is-default-class\":\"true\"}}}'\n ```\n7. Execute this command to verify that the new default StorageClass is called `apigee-sc`: \n\n ```\n kubectl get sc\n ```\n\n\n For example: \n\n kubectl get sc\n\n ```\n NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE\n apigee-sc (default) pd.csi.storage.gke.io Delete WaitForFirstConsumer true 14h\n premium-rwo pd.csi.storage.gke.io Delete WaitForFirstConsumer true 15h\n standard kubernetes.io/gce-pd Delete Immediate true 15h\n standard-rwo pd.csi.storage.gke.io Delete WaitForFirstConsumer true 15h\n \n ```\n8. Describe both the StorageClass to verify the value of **IsDefaultClass** . \n\n ```\n kubectl describe sc apigee-sc\n ``` \n\n ```\n Name: apigee-sc\n IsDefaultClass: Yes\n Annotations: kubectl.kubernetes.io/last-applied-configuration={\"allowVolumeExpansion\":true,\"apiVersion\":\"storage.k8s.io/v1\",\"kind\":\"StorageClass\",\"metadata\":{\"annotations\":{},\"name\":\"apigee-sc\"},\"parameters\":{\"replication-type\":\"none\",\"type\":\"pd-ssd\"},\"provisioner\":\"pd.csi.storage.gke.io\",\"volumeBindingMode\":\"WaitForFirstConsumer\"}\n ,storageclass.kubernetes.io/is-default-class=true\n Provisioner: pd.csi.storage.gke.io\n Parameters: replication-type=none,type=pd-ssd\n AllowVolumeExpansion: True\n MountOptions: \n ReclaimPolicy: Delete\n VolumeBindingMode: WaitForFirstConsumer\n Events: \n \n ``` \n\n ```\n kubectl describe sc standard-rwo\n ``` \n\n ```\n Name: standard-rwo\n IsDefaultClass: No\n Annotations: components.gke.io/layer=addon,storageclass.kubernetes.io/is-default-class=false\n Provisioner: pd.csi.storage.gke.io\n Parameters: type=pd-balanced\n AllowVolumeExpansion: True\n MountOptions: \n ReclaimPolicy: Delete\n VolumeBindingMode: WaitForFirstConsumer\n Events: \n \n ```"]]
