Re: [Xen-users] XEN and failover

[Ernst Bachmann <e.bachmann@xxxxxxxx>]

On Wednesday 08 February 2006 22:27, Thorolf Godawa wrote:
> Hi again :-)
>
> where can I find informations how to realize an automatic failover with
> XEN? Are there any "ready" solution or does it need own scripting for
> recognizing if the guest is still running and if not switching to an other?
>
> Thanks for your answers in advance,

First off, please don't reply to some random thread if you indend to open a 
new one.

Then, for failover, I don't see a reason why you shouldn't be able to apply 
the normal linux failover solutions to xen domUs, like heartbeat etc...

The main problem with failover solutions always is to make sure the failing 
host releases its MAC or IP. Solutions include disabling the port on the 
switch or forcefully cutting power to the host (serially/network controllable 
power switch, configurable UPS, etc...)

With xen you can archive similar results  by "xm destroy" or using brctl to 
disconnect the failing domU. 

However if your entire host/dom0 fails, you'll still need external hardware 
support to be entirely sure an complete switchover works.

failover solutions usually provide means to execute a script whenever action 
is needed, so issuing the right commands to your dom0 should be quite easy.

HTH,
/Ernst 

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