Expanding a basic GPT disk

Hi All,

I have an existing 2.2TB basic disk, formatted with NTFS, partitioned with GPT. This is physically an HP array connected via fibre. The server is Windows 2003 SP2. It is not the system partition, and does not contain the page file.

I need to add more space, so I added more disks to the array, expanded the array, and extended the logical disk. In Windows I can now see that the disk is 3TB with 838GB unused space.

If I try to extend the disk using diskpart I get the error:

DiskPart failed to extend the volume.
Please make sure the volume is valid for extending.

These is the disk with the free space on it:

  Disk ###  Status      Size     Free     Dyn  Gpt
  --------  ----------  -------  -------  ---  ---
  Disk 0    Online        34 GB      0 B
  Disk 1    Online       838 GB      0 B
* Disk 2    Online      3073 GB   838 GB        *

This is the volume that I want to extend:

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
  Volume 0     E   Data         NTFS   Partition    838 GB  Healthy    Pagefile
  Volume 1     C                NTFS   Partition     34 GB  Healthy    System
* Volume 2     F   MSA Data     NTFS   Partition   2235 GB  Healthy
  Volume 3     D                       CD-ROM          0 B  Healthy

Can anybody explain why I can't extend it? My only thought on a solution is to convert it to a dynamic disk, but I don't understand why I'd need to.

Cheers,

AP3