[one-users] Info VM suspension and electric shutdown

[Ruben S. Montero]

Hi

The options are:
1.- Shutdown. This will shutdown the VMs an preserve the changes only of
persistent images. Pro: The procedure is totally safe. Con: You'll loose
state. The redeployment of the VMs may take a long time (need to copy the
disk images again to the hosts)

2.- Suspend. This will checkpoint the VMs. The disk images are left in the
host. Pro: quick you preserve the VM state. Cons: You may loose the disk if
something goes wrong during the host maintenance.

3.- Stop. Same as above but the images are moved to the datastore server
(this depends on the storage). Pro: preserve state. you have a copy in the
storage server. Cons: same as shutdown.


For all the three note that some hypervisors do not handle quite well
concurrency. This is limited at the driver level, and should be enough, but
you may want to not stress the hypervisor and shutdown/suspend/stop the VMs
one by one...

Stop/Suspend operations. Some versions of OpenNebula may delete the VM disk
images if the resume operation fail. If that's your case, before resuming
the hosts you must be sure that the host is up and properly configured...

Cheers

Ruben


On Thu, Mar 7, 2013 at 2:50 PM, Duverne, Cyrille <
cyrille.duverne at euranova.eu> wrote:

> Dear mailing list
>
> I'll have to plan a maintenance slot on my ONE infra.
>
> During the maintenance the whole infra has to be shut down (electric
> maintenance), I have active VM in the infra. May I suspend them, shut all
> machines down, and reactivate them after the reboot ?
>
> Is this tested ? Safe ?
> Any other idea ? (Save VM as isn't an option :) )
>
> Thanks in advance
> Cyrille
>
> _______________________________________________
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> Users at lists.opennebula.org
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>
>


-- 
Ruben S. Montero, PhD
Project co-Lead and Chief Architect
OpenNebula - The Open Source Solution for Data Center Virtualization
www.OpenNebula.org | rsmontero at opennebula.org | @OpenNebula
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