Disk is in "Unknown" State in disk managment

Hello Experts

i have a Dell MD3200i, and i configured a 16 TB LUN on it,
then i mapped it to a windows 2008 R2 server,
in the server disk management i can see the disk in it's "Unknown" state.
when i tried to get it ready for work i get "Incorrect function" error.

i checked that i have configured properly the iScsi initiator and the MPIO on the server.
i also tried to mapped the LUN to another server, and it worked there !

what can i do in order to make it usable on my server ?
Thank you.
IT_Group1Asked:
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noxchoConnect With a Mentor Global Support CoordinatorCommented:
Initialize it like it was suggested above. After that convert it to GPT and create a partition on it.
16TB is absolutely no problem for Windows 2008R2.
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SandyCommented:
16 TB LUN will not be supported by Win 2008 R2 default partition utlility. Suggested solution is to go for 2x8TB LUN at HW RAID configuration then use diskpart cli utility to do the partitioning by converting them in GPT.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
does the error persist, if you reduce the size?
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DhanukadamCommented:
The Unknown status also occurs when you install a new disk but do not successfully complete the wizard to create a disk signature.

To initialize new disks

Open Computer Management (Local).

In the console tree, click Computer Management (Local), click Storage, and then click Disk Management.

Right-click the disk you want to initialize, and then click Initialize Disk.

In the Initialize Disk dialog box, select the disk(s) to initialize.

On x86-based computers running Windows Server 2003 with Service Pack 1 (SP1), Itanium-based computers, or x64-based computers, you can select whether to use the master boot record (MBR) or GUID partition table (GPT) partition style.

The disk is initialized as a basic disk.
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IT_Group1Author Commented:
isn't there a way to make me use a 16 TB disk ?
it should be a backup disk from the storage.

thank you.
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SandyCommented:
2x8TB
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IT_Group1Author Commented:
i used to have one LUN with 9 TB without any problems.
so what is the differences ?
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IT_Group1Author Commented:
plus i see i have this issue only when the server is a virtual one,
when i am mapping the LUN to a physical server it is ok.

any ideas ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
this is using the Microsoft iSCSI initiator in the VM?
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IT_Group1Author Commented:
hi hancoocka

yes it is for both virtual and physical servers.
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IT_Group1Author Commented:
hi  noxcho

so why cant i do that,
can you give me a quick guide how to,
thanks
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noxchoConnect With a Mentor Global Support CoordinatorCommented:
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