[one-users] How to do HA?

[Javier Fontan]

Hello,

Nice to know that it works now! Seems that prior xen 3.3 there are  
some problems when migrating machines with non equal processors (like  
from amd to intel).

For the kind of HA you are asking we have the command checkpoint  
implemented. This command performs a save command in xen, saves the  
state of the VM to disk. This way you can create a cron job that saves  
the state of the VM each some ammount of minutes. If the machine goes  
down then you have a save state of the virtual machine that you can  
use to bring up your machine. There is one problem with this procedure  
and its the state of the VM image. To have a good state save snapshots  
of the images should be made at the same time the save is performed.  
This could be done, for example, with LVM. Right now we only support  
images but supporting LVM partitions is a feature we have in mind.

If your service is not state dependent you can also save & stop (stop  
command) a working VM with the service and use it to run it again in  
almost no time if the service is down.

I hope it helps, bye

On Dec 3, 2008, at 12:01 PM, Himanshu Khona wrote:

> Hi -
> I have tested livemigrate and it works fine between 2 similar  
> hardwares.
> Now this is is manual livemigrate.
> How can we do automated live migration or even just migration?
> The idea is that if 1 physical server goes down, it should migrate  
> the vms to rest of the servers in the pool.
> Thanks,
> Himanshu
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> Users at lists.opennebula.org
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-- 
Javier Fontan, Grid & Virtualization Technology Engineer/Researcher
DSA Research Group: http://dsa-research.org
Globus GridWay Metascheduler: http://www.GridWay.org
OpenNebula Virtual Infrastructure Engine: http://www.OpenNebula.org