In new hard drive existing RAID configured but Disk Management shows unallocated space

Hi,

I am using HP DL380P G8 server, OS window 2008R2. I have already RAID 5 configured in drive with (600GB*4) 1.63 TB space but i need to extend my D drive. So i used HP Array configuration utility tool by which in array i can see my lgical drive space is 2.7TB in HP Array configuration utility tool. But when i open disk management i found my previos space 1.63 TB and rest as a unallocated space. Itried to extend volume but it is grayout.

I can not format my D drive or convert it into dynamic disk.

Please help me out how can i extend volume.