[one-users] onevm migrate/suspend and checkpoint files

[Jaime Melis]

Hi Steven,

unfortunately I'm not able to help with most of the email, however I can
tell you that the underlying operation for checkpointing is the "save"
operation.

http://wiki.libvirt.org/page/VM_lifecycle

regards,
Jaime



On Thu, Jul 24, 2014 at 4:00 PM, Steven Timm <timm at fnal.gov> wrote:

>
> When OpenNebula creates a checkpoint file either as part
> of a onevm migrate or onevm suspend, what libvirt function
> is it calling to do the checkpoint?
>
> We are seeing some issues on our new Ivy Bridge hardware
> that sometimes in the process of a (non-live) migration,
> the clock can get confused in such a way that when the
> virtual machine starts from the checkpoint file
> it will be hung and the kvm process uses 100% of cpu for
> a day or more, and then usually resolves itself.  In some
> cases we see the clock jump very far into the future (2598),
> which in itself can confuse a linux vm enough to hang it.
>
> Any clues on what OpenNebula /libvirt are doing under the covers?
> Is there any reason to suspect that on Ivy Bridge hardware,
> in which there are some 60 different cpu frequencies available
> for cpu scaling, the rapidly fluctuating clock speeds might
> get us into trouble--i.e. suspending the machine on one clock
> frequency and bringig it back on a different clock frequency?
>
> Does anyone have experience in migrating between hardware
> generations... Ivy Bridge -> Westmere and vice versa?
>
> Finally, has anyone run a successful combination of kernel 3.10
> or greater and RHEL6/Centos 6/Sci. Linux 6?
> (In particular do the stock versions of libvirt and qemu-kvm
> play nice with the 3.10 kernel)?
> The 2.6.32 kernel that comes with RHEL6/Centos6/Sci Linux 6 is just not
> up to dealing with virtualization on Ivy Bridge machines and it
> has some trouble on Sandy Bridge too.
>
> Thanks
>
> Steve Timm
>
>
>
> ------------------------------------------------------------------
> Steven C. Timm, Ph.D  (630) 840-8525
> timm at fnal.gov  http://home.fnal.gov/~timm/
> Fermilab Scientific Computing Division, Scientific Computing Services Quad.
> Grid and Cloud Services Dept., Associate Dept. Head for Cloud Computing
> _______________________________________________
> Users mailing list
> Users at lists.opennebula.org
> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>



-- 
Jaime Melis
Project Engineer
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.org | jmelis at opennebula.org
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