Our next step is to create a volume group (or several).
A reason to use more then one volume group, is if our physical volumes
reside on different types of storage (e.g. some come from a fast RAID,
others come from a slow RAID, so we'll use them for less-accessed data).
To create a volume group:
lvm vgcreate VG_YOYO /dev/loop0 /dev/loop2
To see the volume groups available:
root@simey:~/vdisks# lvm vgscan
Reading all physical volumes. This may take a while...
Found volume group "VG_YOYO" using metadata type lvm2