Problem:

I added couple drives to the RAID currently i'm using and finish the initiliazation. I can see the added storage in the Unit Manager menue of the Open-E GUI, but not in the Volume Manager, where I create/expand the LV's.

Solution:

IAfter expanding the RAID array you have to grow the Volume Group size from the "PV resize" function under Extended Console Tools (ALT+CTRL+X).

Please note that this step may cuase a restart.