I fixed this by running the following from the ESXi shell: See if this returns the missing datastore. If so then try mounting with:  
Hello, I accidentally deleted the wrong VD group in the Perc H700 controller. I've recreated the group again but how do I see the data in ESXi (Version 6.5) ? I am now unable to see it as a datastore and there is no option to add an existing one. Is it possible to restore the data?  Thank you
Accidentally deleted VD group from Perc H700.