Hi guys, there is no SW that can resize dynamic disk directly like on a basic disk. To solve the problem, there are two ways.
Backup your server and reset the partition size, then restore it again, using GHOST. Little software supports backing up dynamic disk or volume.
The second way is copy the dyanmic volume to another basic disk to resize or convert it to basic disk directly. I do not recommend convert dynamic disk directly to basic, as it is dangerous if there is an error when converting, besides, you can only convert simple volume.
I've heard that someone using copy dynamic volume to solve this problem, it is safe
refer copy dynamic volume tutorial