[one-users] VM Disaster Recovery without resubmit of harddisk images

[Carlos Martín Sánchez]

Hi Stefan,

That can't be done currently, but I've opened a ticket [1] to evaluate this
feature for future versions.

Meanwhile, the workaround is quite simple:
>From the running or unknown state you can execute a resubmit. This will
move the VM to pending, and the scheduler will re-deploy it in a working
Host. At this point, the VM will be in prolog state [2], and this in when
the disks are copied again to the VM directory.

In the front-end, edit the files /var/lib/one/remotes/tm/shared/ clone
 context  ln  mkimage  mkswap to check if the destination disk file already
exists and exit.

Remember to execute 'onehost sync' after any change in the remotes
directory. This way opennebula will copy the new files to the Hosts in the
next monitorization cycle.

Regards

[1] http://dev.opennebula.org/issues/1639
[2] http://opennebula.org/_media/documentation:rel3.8:states-complete.png

--
Carlos Martín, MSc
Project Engineer
OpenNebula - The Open-source Solution for Data Center Virtualization
www.OpenNebula.org | cmartin at opennebula.org |
@OpenNebula<http://twitter.com/opennebula><cmartin at opennebula.org>



On Mon, Oct 1, 2012 at 4:57 PM, <Stefan.Steinert at brodos.de> wrote:

>  Hi,
>
>  I am currently using OpenNebula with multiple Hosts and the VM Images
> Stored in an shared NFS System. So every Host sees all Images.
>
>  I got now the Problem that I want to provide a fault tolerant system
> with mostly no loss of data on crash.
>
>  Let's have the situation that one of my Host crashes... OpenNebula now
> tells me that the Host is down but still assumes that the VM are running.
>
>  What I now want to do is to restart the VM which was running on the
> crashed Host with the same already deployed hard disk images on a different
> Host still working host to get the system with the existing data back
> running (something like an offline migration but with one host down).
>
> Till now I was not able to find a way to do that in OpenNebula.
>
> Is there already a way and I didn't find it or is that planed as a future
> feature?
>
>  regards
>
>  Stefan
>
> _______________________________________________
> Users mailing list
> Users at lists.opennebula.org
> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opennebula.org/pipermail/users-opennebula.org/attachments/20121107/57746662/attachment.htm>