If the VG is large enough, you can shrink another LV and expand your root LV
If it's not, and 7 GB is all you allocated for the entire VM, you'll have to use your VM tools to expand the drive (if that's possible), then expand your VG and LV to use the added space. If your VM tools can't expand the drive, you can probably add a second disk to your VM, then inside the VM you can add this new disk to your VG and expand your LV.
That was way too many 2-letter acronyms...
VM = virtual machine
VG = LVM volume group
LV = LVM logical volume
Last edited by suicidaleggroll; 06-24-2015 at 08:26 PM.