Dynamic provisioning of Persistent Volume in filesystem

You can create and manage storage classes for dynamic provisioning of workloads.

Storage classes in IBM Storage Scale

There are two versions of storage classes that you can use with IBM Storage Scale. The default version works with all versions of IBM Storage Scale. For storage class examples, see #sf_sds_storage__ex1 and sf_sds_storage.html#sf_sds_storage__ex2. For the storage class to use with IBM Cloud Paks, IBM Storage Scale version (All), see Storage class to use with Cloud Paks.

Note: For IBM Storage Scale Container Storage Interface Driver volume expansion function, include allowVolumeExpansion=true in your Storage Classes. For information about how to set it in a storage class, see the example storage classes in this topic. For more information about volume expansion in CSI documentation, see https://www.ibm.com/docs/en/storage-scale-csi?topic=driver-volume-expansion.

The IBM Storage Fusion detects the version of IBM Storage Scale, and creates storage class for each filesystem.

Procedure to create and apply a storage class YAML:

Create the following YAML and store it in the location of your choice. Retain this YAML until you create the storage class.
Run the following command to apply it:
```
oc apply -f <filename>
```

Storage class(version 1)

The default version that works with all versions of IBM Storage Scale. Example storage class (version 1) for IBM Storage Scale version (All):


apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: ibm-spectrum-scale-csi-fileset-dependent-new
provisioner: spectrumscale.csi.ibm.com
parameters:
  volBackendFs: "ibm-spectrum-scale-fs-mcgpfs3-14544310586575975773"
  filesetType: "dependent"
  parentFileset: "primary-fileset-ibm-spectrum-scale-fs-mcgpfs3-14544310586575975773-2822920183822285462"
reclaimPolicy: Delete
allowVolumeExpansion: true

The file set path pattern is primary-fileset-$FS_CR_NAME-$LocalClusterID. If the fileset does not exist, then IBM Storage Fusion creates it automatically from remote storage class.

For more information about the parameters, see Storage class.

Storage class(version 2)

This second storage class version requires IBM Storage Scale on Storage Cluster. Example storage class(version 2) for IBM Storage Scale version >= 5.1.3:


apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: ibm-spectrum-scale-csi-storageclass-version2
provisioner: spectrumscale.csi.ibm.com
parameters:
  version: "2"
  volBackendFs: "mygpfs" 
reclaimPolicy: Delete
allowVolumeExpansion: true

The optional parameter list depends on the storage class type.

For more information about the additional parameters, see Volume expansion.

Storage classes in Fusion Data Foundation

There are two versions of storage classes that you can use with Fusion Data Foundation:

Filesystem storage class ibm-spectrum-fusion-mgmt-sc and ocs-storagecluster-cephfs
Block storage class ocs-storagecluster-ceph-rbd

Storage class to use with Cloud Paks

Storage class to use with Cloud Paks for IBM Storage Scale
Storage class to use with Cloud Paks for Fusion Data Foundation

IBM Storage Scale

The ibm-storage-fusion-cp-sc storage class is the default for use with IBM Cloud Paks, IBM Storage Scale (All). For IBM Cloud Paks, the permissions parameter is set to shared: true on the storage class.

The ibm-storage-fusion-cp-sc storage class is available for IBM Storage Fusion:

NAME                            PROVISIONER                    RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
ibm-storage-fusion-cp-sc        spectrumscale.csi.ibm.com      Delete          Immediate              true                   2d4h

oc get sc ibm-storage-fusion-cp-sc -o yaml


allowVolumeExpansion: true
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  creationTimestamp: "2023-08-06T13:07:55Z"
  name: ibm-storage-fusion-cp-sc
  resourceVersion: "4107984"
  uid: c8be0a2f-e379-4498-9051-ce8d4cde8d93
parameters:
  shared: "true"
  version: "2"
  volBackendFs: ibmspectrum-fs
provisioner: spectrumscale.csi.ibm.com
reclaimPolicy: Delete
volumeBindingMode: Immediate

Data Foundation: Fusion Data Foundation defines storage classes for ReadWriteOnce (RWO) access and ReadWriteMany (RWX) access separately.
During the installation of IBM Cloud Paks, the --block_storage_class option must point to block storage class that supports ReadWriteOnce (RWO) access, which is ocs-storagecluster-ceph-rbd. The --file_storage_class option must point to a file storage class that supports ReadWriteMany (RWX) access, which is ocs-storagecluster-cephfs.

Note: For supported IBM Cloud Paks versions, see IBM Cloud Paks support for IBM Storage Fusion.