Can't see new files in Windows Server 2012

I have LUN with LUN type is Windows 2003 MBR.
I use for 2 Windows Server 2012, they can see LUN but when i create new files ( text,mp3... ) in server A, server B can't see this file.

I try to create new LUN with LUN type is Windows 2008 but i have same issue.
So, what can i do ?
Thanks for supporting me.
Bach

Model: FAS2240-2
Version:NetApp Release 8.1RC3 7-Mode