Setup StorageClass

The parameters of IOMesh storage class are:

Parameter	Value	Default	Description
csi.storage.k8s.io/fstype	"xfs", "ext2", "ext3", "ext4"	"ext4"	volume File system type
replicaFactor	"2", "3"	"2"	replica factor
thinProvision	"true", "false"	"true"	thin provision or thick provision.

After IOMesh CSI driver was installed, a default StorageClass iomesh-csi-driver would be created. You may also create a new StorageClass with customized parameters:

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: iomesh-csi-driver-default
provisioner: com.iomesh.csi-driver # <-- driver.name in iomesh-values.yaml
reclaimPolicy: Retain
allowVolumeExpansion: true
parameters:
  # "ext4" / "ext3" / "ext2" / "xfs"
  csi.storage.k8s.io/fstype: "ext4"
  # "2" / "3"
  replicaFactor: "2"
  # "true" / "false"
  thinProvision: "true"
volumeBindingMode: Immediate

About the reclaimPolicy

The reclaimPolicy attribute of StorageClass can have two values of Retain and Delete, and the default is Delete. When a PV is created through StorageClass, its persistentVolumeReclaimPolicy attribute will inherit the reclaimpolicy attribute from StorageClass. You can also modify the value of persistentVolumeReclaimPolicy manually.

The value of reclaimPolicy in the example is Retain, which means that, if you delete a PVC, the PV under the PVC will not be deleted, but will enter the Released state. Please note that, if you delete the PV, the corresponding IOMesh volume will not be deleted, instead, you need to change the value of persistentVolumeReclaimPolicy of the PV to Delete and then delete the PV. Or before creating a PV, you can set the value of reclaimpolicy of StorageClass to Delete so that all the resources will be released in cascade.