[Users] Automated Failover

[René Koch]

Hi,

On 02/14/2014 05:45 PM, ml ml wrote:
> Hello,
>
> i am currently running two nodes with VMs on it. They are all set up as
> "High Available". However, if i unplugg a node and turn it off, the VMs
> wont get started on the 2nd node.
>
> Do i need fencing, watchdog or anything else to get this feature work?

Yes, you need working fencing (power management).
Vms will only start on the second node if they are marked as high 
available and fencing of the broken node succeeded.

>
> Since i have two nodes and one ovirt engine this should be enough for
> quorum.

Quorum is ok, but what if e.g. the following happens:
Node 1 is not reachable due to a switch failure, but vm is still running 
on it. If you would start the vm on the second node, it would run twice 
and you can imagine what happens with the disk file...

>
> Where can  read up more in detail how the heartbeat and automated
> failover works?

I think the oVirt wiki should have information about this.

>
> Thanks,
> Mario


Regards,
René


>
>
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