Suspend a guest virtual machine with virsh:

# virsh suspend {domain-id, domain-name or domain-uuid}

When a guest virtual machine is in a suspended state, it consumes system RAM but not processor resources. Disk and network I/O does not occur while the guest virtual machine is suspended. This operation is immediate and the guest virtual machine can be restarted with the resume (Section 14.8.6, “Resuming a Guest Virtual Machine”) option.