Cannot Allocate Disk Space on Fujitsu Server RAID 5 Configuration


I am from installing Windows Server 2012 R2 on a Fujitsu Primergy TX300 S8 server.
This server has 8 x 4TB hard disks which I configured as RAID5. In the disk management it shows a total of about 21TB and I was able to create two partitions of about 1TB each where  I loaded the OS and the other partition for Exchange Server.
The challenge is that am unable to allocate the remaining space for use. When I right click the functions to enable disk allocation they are greyed out. Kindly see the screen shot.
I need help with this one.

Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Seth SimmonsSr. Systems AdministratorCommented:
that's because the drive is MBR which only allows the first 2tb
you need to have the disk as GPT then you can use the entire disk
fbandaAuthor Commented:
Hi Seth,

Seeing that I have already installed the OS can I convert the unallocated partition as GPT?
If so how do I go about it.

Seth SimmonsSr. Systems AdministratorCommented:
you will need to reinstall windows
and it's not the partition, it's the entire drive that is either MBR or GPT
if you right-click on disk 0 you can see the convert to GPT option disabled; it's at the disk level, not partition
The 7 Worst Nightmares of a Sysadmin

Fear not! To defend your business’ IT systems we’re going to shine a light on the seven most sinister terrors that haunt sysadmins. That way you can be sure there’s nothing in your stack waiting to go bump in the night.

fbandaAuthor Commented:

Alright I will do as advised and get back to you.

fbandaAuthor Commented:
Hi Seth,

Am still hitting my head against the wall.
What I need is to have four partitions out of the 21TB (this has been created after running the RAID configuration consisting of 8x4TB SAS hdds) as follows:

500GB for the OS, 500GB for the applications, two 10TB partitions for storage.
I have used diskpart to change the drive to GPT and that seems to accept the command but when I start installing Windows (Server 2012 R2) the drive appears to lose the property for GPT and thus I cant create the partitions.

I hope you understand what am trying to achieve.
Seth SimmonsSr. Systems AdministratorCommented:
are you booting UEFI?
if not, it won't work correctly as GPT
fbandaAuthor Commented:

I am not able to locate the UEFI settings in BIOS. That's another challenge an facing.
fbandaAuthor Commented:

I did a RAID 5 configuration on the Fujitsu server and was able to partition the logical drive(26TB)  in Windows Server 2012r2  using diskpart to convert the disk to GPT sothat I could allocate the whole partitions as requited.
And I partitioned as follows:
2 x 1TB, 2x 10 TB (there are four partitions plus two more partitions that windows automatically created).
I managed to run setup onto one of the 1TB partitions and completed successfully, however, upon finishing installation and rebooting, the machine wont boot up. it shows the error "Windows failed to start. A recent hardware or software change might be the cause. To fix the problem:
1. Insert your windows installation disk and restart your computer
2. Choose your language settings, and then click "next."
3. Click repair your computer
There are two option on the bottom of the screen as follows:

Option 1 Enter=OS Selection, Option 2 ESC=UEFI Firmware settings.

The challenge is that I don't know how to change the UEFI firmware settings on the machine (Fujitsu Primergy TX300 S8)
I think that could be the cause for the machine failing to boot up.

Your help will be greatly appreciated.

fbandaAuthor Commented:

I managed to find the UEFI setting on the server and all is well now.

Seth SimmonsSr. Systems AdministratorCommented:
ok great
not familiar with fujitsu servers so wasn't sure how to configure UEFI but that (and GPT) was definitely causing the 2tb boundary

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.