Windows 2008 R2/2012 R2 - Unable to use all of 9TB RAID

HP SmartArray P410 with 4x3TB SAS drives.

Install Windows 2008 R2 or Windows 2012 R2 and set up a 2TB boot drive It leaves 7TB unallocated. Try to add a partition with that unallocated space through storage management and it doesn't allow me to do anything. Every option is greyed out.

Controller issue? Or Windows issue?
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Adam BrownSr Solutions ArchitectCommented:
This is likely because the drive was created as an MBR drive and not a GPT drive. has instructions on converting. You'll lose all your data if you do that. though.
mvalpredaAuthor Commented:
I would not be able to boot off that then correct?

Was trying to create another container, but this controller doesn't seem to let me.
Adam BrownSr Solutions ArchitectCommented:
A GPT partition is bootable. You would need to re-install the OS to boot it though.
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mvalpredaAuthor Commented:
I tried to convert to GPT when I did the Windows 2012 R2 setup. It made a 9TB partition. Do I need to make that <2TB then in order to boot?
Adam BrownSr Solutions ArchitectCommented:
If it's an older controller that doesn't support boot from larger than 2TB, then yes. Typically, the server you connect the SAN to will need to have a UEFI/EFI BIOS to allow GPT compatibility for large boot partitions.
A Gpt disk can only boot an m$ OS if the mainboard supports UEFI. If it doesn't support UEFI,  you can only boot Linux and maybe BSD type OS's from gpt disks.

So if your BIOS can't be set to UEFI mode, you will have to create one small Raid volume with MBR for your OS, and the other a large volume which you can set to gpt for your data. You should be able to create more than one volume using your controller's setup utility.

also, it doesn't make any sense using a huge drive or partition for the OS, you should rather have a smallish drive or partition anyway for that, and the data on a separate one, so if i were you i'd do that even if your BIOS supports UEFI.
mvalpredaAuthor Commented:
I think I remember what I need to do in order to create a container on this drive. HP doesn't let you configure much through the controller on POST, you have to boot to the HP Smart Smart CD and then configure the RAID. I will then create a 500GB boot drive and life will be good.

Downloading that now.
andyalderSaggar maker's bottom knockerCommented:
Problem sorted? You do indeed need SmartStart for the reason you mentioned although the ACU is available under Intelligent Provisioning during POST on G8 servers.

Strange thing is HP were the first implementers of EFI with the Itanium based Integrity servers but still haven't introduced it to the ProLiants.

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Windows Server 2008

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