We have Windows 2012 R2 Hyper-V cluster managed by SCVMM 2012 R2 UR3.
We decide to migrate our guest clusters (file and MSSQL) from iSCSI to shared VHDX. I see the option for disk sharing in Hyper-V console, but i don't see this option in the VM "Hardware configuration" tab of VMM console (the option present only for templates, but not for VM properties). I see "Contains the operating system..." checkbox only.
I don't know, is this UR issue because I don't remember if this option was before I applied any UR. :-) This issue is same on server console and console on my PC.
P.S. I also don't see option for high-available VM in the VM creation wizard when I use the VMM console on my PC (this option present on the VMM server-installed console only).