[one-users] Questions about host & VM failover mechanisms

[Tino Vazquez]

Hi Ranga,


comments inline,


On Tue, Oct 27, 2009 at 6:41 PM, Rangababu Chakravarthula <
rbabu at hexagrid.com> wrote:

> Opennebula team,
>
> (a) What mechanism does Opennebula use to monitor hosts?
>

It sends probes (scripts) using ssh


>
> (b) I would like to know how we can migrate VM's in the following two
> scenarios.
>
> (1) The host might be up but due to some network issues, opennebula is not
> able to monitor the host.
>  (a) Does it move the host status to ERR?
>

Yep, but it keeps trying to monitor them


>  (b) What does it do to the VM's. Does it move to a different state?
>

No, it tries to connect to them.


>  (c) Is there a mechanism to automatically migrate those VM's to different
> host?
>

If the host is unreachable, this is tough to do.


>
> (2) When somebody manually shutdown the host. Vm's on that host are not
> accessible anymore for users.
> Is there a way during the shutdown sequence we can trigger a script to
> migrate the VM's ? Because, by the time opennebula
> finds that host is down users will get effected. How to address this?
>

This is tricky. If the physical host is shuttted down, there is virtually
not a lot you can do, appart from maybe starting the VMs again in another
host.


>
> Thanks
> Ranga
>

Hope it helps,

-Tino


>
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>



--
Constantino Vázquez, Grid Technology Engineer/Researcher:
http://www.dsa-research.org/tinova
DSA Research Group: http://dsa-research.org
Globus GridWay Metascheduler: http://www.GridWay.org
OpenNebula Virtual Infrastructure Engine: http://www.OpenNebula.org
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