Extend Volume grayed out Server 2008

I need to extend existing volume but the option is greyed out. It is Windows Server 2008 with iSCSI storage from HP MSA unit. Is it becasue it is around 2TB? Do I need to convert it to GPT? How do I do it without losing data? See the screenshot for more info (Disk 1 - dynamic, volume SAN).

Screenshot
MisUszatekAsked:
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AustinComputerLabsCommented:
you will need GPT to go beyond 2TB. Make sure to research GPT and your systems ability to use it, before moving forward.
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MisUszatekAuthor Commented:
That was my assumption. Can somebody elaborate on that a little more?
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AustinComputerLabsCommented:
From: http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/2003_Server/Q_24174796.html?sfQueryTermInfo=1+10+30+convers+gpt

There is an open-source tool called gptgen (https://sourceforge.net/projects/gptgen/ - yes, it's my project), which can convert an MBR disk to GPT, while preserving data on the disk. The only requirement is that there must be enough space at the beginning and end of the disk/array.
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noxchoGlobal Support CoordinatorCommented:
I don't think your problem is in GPT or MBR or dynamic disk. MBR and Dynamic disks can have size of 2048GB and your volume is only 1907GB in size. So you still have at least 140GB in reserve. Most possibly the extend option is disabled as you have SAN configuration.
I would suggest going trough copy out data from this volume - delete it - convert the disk to basic HDD first - then convert it to GPT - and recreate the volume to gain access to entire space available on HDD.
Then copy data back.
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Windows Server 2008

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