How to create a live snapshow of a running KVM virtual machine
KVM Snapshotting and Cloning 101 Snapshotting First the VM must be in qcow2 format. Do this to check: virsh dumpxml nsx.example.com | grep -i qemu
virsh
How to convert a raw .img KVM file to a .qcow2 file
Qcow2 is a better format for various reasons, see this link. If you have a KVM host and some of the computers are in img
KVM Cheat Sheet
KVM Cheat Sheet Errors Requested operation is not valid: cannot resize the maximum memory on an active domain To increase the memory size: virsh setmaxmem