lvcreate -L 1G -n lv_GRUB0 /dev/vg_1
mke2fs -L "$HOSTNAME:GRUB0" -t ext4 /dev/vg_1/lv_GRUB0 
mkdir /GRUB0
mount LABEL="$HOSTNAME:GRUB0" /GRUB0/
grub-install --boot-directory /GRUB0 --recheck /dev/sdb
grub-install --boot-directory /GRUB0 --recheck /dev/sda