To resize a virtual drive
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Resizing a virtual drive (machine must be off): 0) Read man page
man virt-resize
1) Shut Machine down
virsh shutdown myvm
2) Be extra safe and make a copy of the disk (space permitting)
cp myvm-disk1 myvm-disk1~preresize
3) Examine virtual drive's structure
virt-filesystems --long -h --all -a myvm-disk1~preresize
4) Create new drive (this uses the QCOW2 format. Multiple options available)
qemu-img create -f qcow2 -o preallocation=metadata myvm-disk1~postresize 15G
5) Use vm resize command to populate new disk with expanded partitions (and also expand LVM if applicable)
virt-resize --expand /dev/sda2 --lv-expand /dev/vg_myvm/root_lv myvm-disk1~preresize myvm-disk1~postresize
6) To expand more than 1 LVM partition, repeat the process
qemu-img create -f qcow2 -o preallocation=metadata myvm-disk1~postresize2 25G virt-resize --expand /dev/sda2 --lv-expand /dev/vg_myvm/var_lv myvm-disk1~postresize myvm-disk1~postresize2
7) Swap file names around
mv myvm-disk1 myvm-disk1~original mv myvm-disk1~postresize2 myvm-disk1
8) Start virtual machine
virsh start myvm
9) Cross fingers
10) If all is OK, clear out old and temporary disks
rm myvm-disk1~postresize rm myvm-disk1~original