lvm.sh

# list lvm partitions
sudo lvmdiskscan
sudo lvdisplay

# mount lvmgroup/lvmvol
sudo mount /dev/<VolGroup00?>/<LogVol00?> /mnt # /dev/VG_Name/LV_Name

# check if lvm used by vm
virsh list
virsh edit <vm name> # look for device='disk'

# lvm resize example
# 200G hdd
resize2fs /dev/vg0/foo 180G # resize filesystem

lvreduce --size 180G /dev/vg0/foo # resize logical volume

lvcreate --size 20G -n bar vg0 # create new volume

mkfs.ext4 /dev/vg0/bar

# create mountpoint
mkdir /mnt/vg0 
# add to fstab
/dev/vg0/bar  /mnt/vg0  ext4  defaults  0 2

# convert
qemu-img convert -O qcow2 /dev/mapper/lv_name <destination_file>.qcow2