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Re: [libvirt] save / restore for KVM



Hello again,

Am Sonntag, 6. Juli 2008 16:00:32 schrieb Matthias Pfafferodt:
> Hello,
>
> Am Samstag, 5. Juli 2008 18:48:13 schrieb 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.
>
> Sorry, I'm using opensuse 10.3 with the following libvirt / kvm packages:
>
> # rpm -qa | grep libvirt
> libvirt-python-0.4.4-12.1
> libvirt-0.4.4-12.1
> libvirt-devel-0.4.4-12.1
> libvirt-doc-0.4.4-12.1
> # rpm -qa | grep kvm
> kvm-70.git-2.4
> kvm-kmp-default-70_2.6.22.18_0.2-2.2

I got it running using the right combination of rpms:

# rpm -qa | grep kvm
kvm-70-8.2
kvm-kmp-default-70_2.6.22.18_0.2-8.2

save / restore is working now. 

Kind regards

Matthias

>
> > > 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.
>
> So 'virsh save' should work. Is there a possibility to debug this to get
> information why it does not restore the vm? Or to test the used migration
> protocol using only one computer?
>
> Matthias
>
> resend - forgot the list ...
>
> > Daniel
>
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-- 
Matthias Pfafferodt - http://www.mapfa.de
Matthias.Pfafferodt <at> mapfa.de


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