[one-dev] announcing addon plan: shared-lvm-single-lock

[Jaime Melis]

Hi Mihály,

I'm sincerely looking forward to seeing this addon and I think it would
help to many OpenNebula users.

Do you have anything already done? Maybe I could take a quick look at it
and give you some feedback?

As a general recommendation I'd like to point out that it would be great if
you could reuse code from other DS and TM drivers.

cheers,
Jaime



On Wed, Nov 27, 2013 at 11:17 PM, Mihály Héder
<mihaly.heder at sztaki.mta.hu>wrote:

> Hi,
>
> I want to announce my plans to create addon-shared-lvm-single-lock which
> would be the current version of the patches detailed here:
> http://wiki.opennebula.org/shared_lvm
>
> In a nutshell: the patch lets OpenNebula to use commercial off the shelf
> SANs that are providing a few pre-configured LUN-s as block devices over
> iSCSI, AoE or FC.
>
> The block devices in question are mounted on all the nodes and on the
> frontend, too. The device is split up to logical volumes that are only
> active on the node that runs the VM in question but are present everywhere.
> This allows live migration that is facilitated by migration hooks which
> activate and deactivate volumes as the instance travels.
> This way, in certain cases the use of cLVM can be spared as all nodes
> except the frontend can run with read-only lvm metadata setting, meaning
> that local locking is sufficient on the frontend. This is only as long as
> other storage drivers don't try to modify any lvm vgs on the nodes - they
> won't work because of the read-only metadata.
>
> Please comment on the matter! Thanks!
>
> Cheers
> Mihály Héder
> MTA SZTAKI HBIT
>
> _______________________________________________
> Dev mailing list
> Dev at lists.opennebula.org
> http://lists.opennebula.org/listinfo.cgi/dev-opennebula.org
>
>


-- 
Jaime Melis
Project Engineer
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.org | jmelis at opennebula.org
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