[libvirt] save / restore for KVM

[Daniel P. Berrange]

On Sat, Jul 05, 2008 at 01:59:26PM +0200, Matthias Pfafferodt wrote:
> Hello,
> 
> I try to save a KVM domain which has its hard disk on a LVM volume. I can 
> execute the command to save the domain but restore fails
> 
> # virsh list
>  Id Name                 State
> ----------------------------------
>   3 kvm-linux03          running
>   4 kvm-linux01          running
> 
> # virsh save kvm-linux01 ./kvm-linux01.ram
> Domain kvm-linux01 saved to ./kvm-linux01.ram
> 
> # virsh list
>  Id Name                 State
> ----------------------------------
>   3 kvm-linux03          running
> 
> # virsh restore ./kvm-linux01.ram
> libvir: QEMU error : operation failed: failed to start VM
> error: Failed to restore domain from ./kvm-linux01.ram

You don't mention which version of KVM or libvirt being used, or which
distro. If its Fedora then plesae file a bug against libvirt or KVM.
There's one possible issue in KVM that could be causing it depending
on which version you're using.

> I tried to save and restore this domain using kvm directly
> 
> # /usr/bin/qemu-kvm -m 1024 -boot c -drive 
> file=/dev/virtual/kvm_linux01,if=ide,index=0,boot=on -net 
> nic,macaddr=00:16:3e:00:01:02,vlan=0 -net 
> tap,fd=24,script=,vlan=0,ifname=vnet3 
> (qemu) savevm kvm-linux01.ram
> Device id0-hd0 does not support VM state snapshots

Libvirt doesn't use  savevm - it uses the migration protocol support
instead.

Daniel
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