Red Hat Training
A Red Hat training course is available for Red Hat Enterprise Linux
16.8. virt-resize: Resizing Guest Virtual Machines Offline
This section provides information about resizing offline guest virtual machines.
This section describes
virt-resize, a tool for expanding or shrinking guest virtual machines. It only works for guest virtual machines which are offline (shut down). It works by copying the guest virtual machine image and leaving the original disk image untouched. This is ideal because you can use the original image as a backup, however there is a trade-off as you need twice the amount of disk space.