[one-users] Using shared fs and ssh TM

[Javier Fontan]

You are right. I've overlooked the driver. In qcow the mv driver is
dummy as it expects the qcow image to be shared. You can just copy mv
script from ssh tm to qcow remotes directory. I have not tested that
but it should work. The qcow image will me moved on stop to the
frontend and on resume back to a node. The backing storage path should
be the same in your setup.

On Wed, Jul 11, 2012 at 6:07 PM, Andreas Calvo <andreas.calvo at scytl.com> wrote:
> The shared storage is mounted in the same place in all the nodes.
>
> The directory structured is as follows:
> /var/lib/one/datastores (shared storage)
> -- 0 -> link to /one/datastores/0
> -- 1
> -- 100
>
> /one/datastores/ (local storage)
> -- 0
> -- 1 -> link to /var/lib/one/datastores/1
> -- 100 -> link to /var/lib/one/datastores/100
>
> When a virtual machine is stopped, its delta is stored in
> /one/datastores/0/$VMID.
> When another node tries to resume the virtual machine, expects to have in
> the same place the delta (and some other files, like the checkpoint), but,
> as it is not in its local disk, it fails.
>
> Same thing happen when a virtual machine is migrated.
> I think the TM should be tweaked to be part qcow and part SSH.
>
> El 11/07/12 17:51, Javier Fontan escribió:
>
>> If the shared datastore is mounted in the same place in both nodes
>> there wont be any problem. The base image will be accessible from both
>> nodes (shared) and the qcow delta is moved to the host.
>>
>> On Wed, Jul 11, 2012 at 12:59 PM, Andreas Calvo <andreas.calvo at scytl.com>
>> wrote:
>>>
>>> Javier,
>>> Thanks for your quick reply!
>>> The only problem is that when a stopped virtual machine is resumed from
>>> another host in the cloud (different from which it was stopped), as it
>>> cannot find the deployed (in this case, linked) image and the deltas.
>>>
>>> El mar 10 jul 2012 11:46:55 CEST, Javier Fontan escribió:
>>>
>>>> Sure it is possible. You need to have the datastore that holds the
>>>> images shared and mount it in every node. Then you'll make the system
>>>> datastore(0) local and configure it to use qcow tm drivers. Make sure
>>>> that /var/lib/one/datastores/0 is not mounted from the shared storage
>>>> in the nodes as this is where the deltas will be written.
>>>>
>>>> On Mon, Jul 9, 2012 at 11:59 AM, Andreas Calvo <andreas.calvo at scytl.com>
>>>> wrote:
>>>>>
>>>>>
>>>>> Hello,
>>>>> Is there any way to mix TM in an environment?
>>>>> We currently have a shared FS with GFS2 using qcow, but when a lot of
>>>>> VMs
>>>>> are launched, writing changes becomes a I/O bottleneck.
>>>>> We were thinking of a mixture where the image is shared and the
>>>>> incremental
>>>>> changes (qcow) are write locally.
>>>>>
>>>>> Is it possible?
>>>>>
>>>>> Thanks
>>>>>
>>>>> --
>>>>> Andreas Calvo Gómez
>>>>> Systems Engineer
>>>>> Scytl Secure Electronic Voting
>>>>> Plaça Gal·la Placidia, 1-3, 1st floor · 08006 Barcelona
>>>>> Phone: + 34 934 230 324
>>>>> Fax: + 34 933 251 028
>>>>> http://www.scytl.com
>>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Andreas Calvo Gómez
>>>> Systems Engineer
>>>> Scytl Secure Electronic Voting
>>>> Plaça Gal·la Placidia, 1-3, 1st floor · 08006 Barcelona
>>>> Phone: + 34 934 230 324
>>>> Fax:   + 34 933 251 028
>>>> http://www.scytl.com
>>>>
>>>> NOTICE: The information in this e-mail and in any of its attachments is
>>>> confidential and intended solely for the attention and use of the named
>>>> addressee(s). If you are not the intended recipient, any disclosure,
>>>> copying,
>>>> distribution or retaining of this message or any part of it, without the
>>>> prior
>>>> written consent of Scytl Secure Electronic Voting, SA is prohibited and
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>>
>>
>>
>
> --
> Andreas Calvo Gómez
> Systems Engineer
> Scytl Secure Electronic Voting
> Plaça Gal·la Placidia, 1-3, 1st floor · 08006 Barcelona
> Phone: + 34 934 230 324
> Fax:   + 34 933 251 028
> http://www.scytl.com
>
> NOTICE: The information in this e-mail and in any of its attachments is
> confidential and intended solely for the attention and use of the named
> addressee(s). If you are not the intended recipient, any disclosure,
> copying,
> distribution or retaining of this message or any part of it, without the
> prior
> written consent of Scytl Secure Electronic Voting, SA is prohibited and
> may be
> unlawful. If you have received this in error, please contact the sender
> and
> delete the material from any computer.
>
>
>



-- 
Javier Fontán Muiños
Project Engineer
OpenNebula - The Open Source Toolkit for Data Center Virtualization
www.OpenNebula.org | jfontan at opennebula.org | @OpenNebula