Error "CnsFault error: VSLM task failed" is seen when the cluster is migrating from vsphere in-tree driver to CSI drive or when a new persistent volume is created using vSphere CSI driver..

Issue

• After the upgrade process, pods can't be mounted or created.
• New pvs created from the thin or thin-csi storageclasses are stuck in Pending state and existent pvs provided from the same storageclasses are unable to be mounted.