Hello Kinnison,
Thank you for responding.
VMware vSAN Ready nodes (Dell Servers)... and yes, I did check compatibility and it is supported.
I upgraded from 6.7 to 7.0U3 Dell customized image.
and update been done via lifecycle manager. all hosts updated successfully but some hosts doesnt show local datastore and some hosts does show local datastore ( all using same build number 7.0U3)