I have a Volume Group with Unused space. This 40Gig should become an entidy in order to install Microsoft windows 7 on it. I do not have extra space on the drive - that is why I want to shrink the VG!

LVG berta resides on sda2 and consists of

lv_root
lv_swap
unused_space

I want it to become

lv_root
lv_swap

and have a seperate entidy made out of unused_space. Microsoft Windows 7 has to get installed on this entidy. I do not understand why Linux made simple things complicated. I utterly hate LVM and think its absolute bollocks.

Useful Sources:

http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-system-config-lvm.html

Edit: I found the answer. The necessary steps depict how complicated LVM really is. In my opinion it is best to avoiding LVM until pvresize matures as promised in its man pages.

Answer:

http://fedorasolved.org/Members/zcat/shrink-lvm-for-new-partition

If you run into problems when you want to remove lvswap even if in resuce mode, then try

swapoff /dev/vg_1/lv_swap 
lvchange -an /dev/vg_1/lv_swap