GPT Disk and Hyper-V

I have a server that I am building into a Hyper-V machine. It has 2 300 Gb Raid 1 disks that I am using for Server cor and then I have 6 - 900 Gb Raid 5 disks that I am going to use for my Hyper-V machines and data associated with the hyper-v machines.

In a Hyper-V installation how do I get Windows Server 2012 R2 to see a larger disk?
Please look at the 2 attachments.
Server Core Computer Managerment Screen
When I attempt to install Windows Server into Hyper-V I see the following disk(s) available.
Drive Partitioning on new Hyper-V
Howe do I get all disk space available?
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Seth SimmonsSr. Systems AdministratorCommented:
to use a drive over 2tb for booting, the guest must boot using UEFI
then it can use the entire drive
that's why you see only 2tb, then 1tb
if you select the 1tb, it will tell you that windows cannot be installed there; even after installing in the 2tb space, that 1tb won't be available as MBR
LostInWindowsAuthor Commented:
I suppose that a better question to ask is how do I set the data disk to UEFI?That is in BIOS isn't it?
What reason do you need to install the OS on a disk larger than 2TB for? You should always use a relatively small MBR disk for the OS, and then add another Virtual disk for the data which can be larger and a GPT disk. That makes management and backing up much easier.
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No, that isn't set in the BIOS. You do that via diskmanagement, and you don't set it to UEFI, but rather to GPT.
Gary CaseRetiredCommented:
In Hyper-V terms, you have to create a Generation 2 VM ... this will have a UEFI BIOS and will allow you to do what you want here.
I am assuming that you want the guest VM to recognize a disk larger than 2TB for it's boot partition?  If so, you need to be running Hyper-V on Windows Server 2012 R2 (which you state that your host operating system is).  Then you need to specify a Generation 2 VM.

David Johnson, CD, MVPOwnerCommented:
one normally doesn't use physical disks for virtual machines but creates virtual hard disks .vhd (up to 2TB MBR) or .vhdx (2TB maximum size MBR) or .vhdx (gpt up to 64TB).  By using virtual hard disks one can have several machines on a physical volume rather than dedicating that volume to 1 virtual/physical machine

If you want to use >TB as a boot volume you need the following requirements: UEFI bios, and boot from UEFI media. Microsoft install media has both boot loaders available (MBR and UEFI) and one would use the boot menu options from the bios to select which to use.

on your base installation I do see one abnormality you should have NO drive letter here and it should be marked as system reserved

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LostInWindowsAuthor Commented:
Thanks for your input. I  have set up an OS drive of 350 Gb and I will add Data drives later. I have never done the data drive thing on Hyper-V. I assume it is the same as a Physical server.
Lee W, MVPTechnology and Business Process AdvisorCommented:
Separate VHDs for Data is HIGHLY preferable - you can easily move/assign the VHD to another server if you must or even mount it as a drive locally if necessary.
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