Some of the VMs in a vSphere DRS cluster are not migrated as expected.

https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.resmgmt.doc/GUID-23B01178-1EFF-4EDD-8157-6A2C85057D37.html

VDP Appliance storage Max size

https://docs.vmware.com/en/VMware-vSphere/6.5/rn/data-protection-6110-release-notes.html#supportedenvironments