Re: if we Unmount a datastore what does it mean

Hi Mr Vmware

If you unmount a Datastore from an ESXi Host, then the files are now inaccessible by that Host. It is normally a pre-cursor to removing/unpresenting that LUN from the ESXi Host from within your Storage Admin Console. You have to beware of certain pre-requisites before you do this. The article link below gives you more information :-

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2004605

All the best !