Storage class for creating lightweight volumes

Create lightweight volumes by using storage class.

The configuration is as follows:


apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: ibm-spectrum-scale-csi-lt
provisioner: spectrumscale.csi.ibm.com
parameters:
  volBackendFs: "gpfs0"
  volDirBasePath: "pvfileset/lwdir"
reclaimPolicy: Delete

The following fields come under the parameters section of storageClass. Parameters section is mandatory for IBM Storage Scale CSI driver storageClass:

Field name	Description
volBackendFs	The file system on which the directory-based volume must be created.
volDirBasePath	The base path under which all volumes with this storage class is created. This path must exist. The relative path from the file system mount point.
uid (optional)	The username of the directory. The uid/gid must exist on the IBM Storage Scale GUI node.
gid (optional)	The group name of the directory. The uid/gid must exist on the IBM Storage Scale GUI node.
shared (optional)	Use `shared`=`true`, if you have pods with non-root users that are using PVCs with `ReadWriteMany`(RWX) access mode. Default value is false.
nodeClass (optional)	The user can specify a pre-existing `nodeClass` in `storageClass`, so that the pre-existing `nodeClass` is used when a volume is created from an existing volume or snapshot. If a `nodeClass` is specified, only the node belonging to it participates in data copy. Note: For more information about `nodeClass`, see IBM Storage Scale `nodeClass` command.

Note:

Since lightweight volume does not enforce quota, it can grow beyond defined size, which may result in consuming whole file system. To avoid this, you must manually create or use an existing fileset to host the lightweight PVC volumes. This can be done by specifying the directory inside fileset for volDirBasePath option.
Do not use filesets that are created by the IBM Storage Scale Container Storage Interface driver for hosting lightweight volumes. When fileset-based volumes get deleted, all the data under the fileset, including lightweight PVC if created, also gets deleted.