You can migrate traditional datastores to VVOLs.
Important: You must make sure that VASA Provider is not running on one of the virtual machines you plan to migrate. If you migrate a virtual machine that is running VASA Provider to a VVOLs datastore, you will not be able to perform any management operations, including powering on virtual machines that are on VVOLs datastores. In addition, you will lose access to all VVOLs because VASA Provider will not be able to boot.
When you migrate from a standard datastore to a VVOLs datastore, the vCenter Server does not use vStorage APIs for Array Integration (VAAI) offloads. VAAI offloads normally reduce the load on the host.