root@vswitch-BlackfordESB2:/home/vswitch# vgdisplay
  No volume groups found
root@vswitch-BlackfordESB2:/home/vswitch# vgcreate vm /dev/sda1
  No physical volume label read from /dev/sda1
  Can't open /dev/sda1 exclusively.  Mounted filesystem?
  Unable to add physical volume '/dev/sda1' to volume group 'vm'.
root@vswitch-BlackfordESB2:/home/vswitch# pvdisplay

root@vswitch-BlackfordESB2:/home/vswitch# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1              60G  4.2G   53G   8% /
udev                  3.6G  4.0K  3.6G   1% /dev
tmpfs                 1.5G  1.1M  1.5G   1% /run
none                  5.0M     0  5.0M   0% /run/lock
none                  3.6G     0  3.6G   0% /run/shm

# vgcreate vm /dev/sda2

# lvcreate -L 10G -n lv0 vm

# mkfs.ext4 /dev/mapper/vm-lv0