The ability to set a newly added harddisk to a powered on VM to multi-writer seems to be new in ESXi 6 via the web client, but I can't find any documentation to say so. Anyone know where this might reside? See image
This is not new feature, it was there in older ESXi versions/VI Client also.
https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=10341...