Server does not see changes on LUN made by other Servers

Hello,

I currently have a Bladecenter which has 2 Blades accessing the same LUN of the Storage of the Bladecenter.

If I create a new folder on one Blade (Server) the other Blade does not see this folder. But currently both have VMs running from the LUN without problemsand are up to date Windows Server 2012.

How is it possible that the one machine does not see changes made by the other Server?

Hope someone can assist in resolving the problem.

Thanks in advance

Whity88