[one-dev] announcing addon plan: shared-lvm-single-lock
Javier Fontan
jfontan at opennebula.org
Thu Dec 19 02:11:47 PST 2013
On Wed, Dec 18, 2013 at 4:38 PM, Mihály Héder <mihaly.heder at sztaki.mta.hu>wrote:
> I think you mixed Nicolas and me up.
>
I did :(
> Anyway, if you could create the addon addon-shared-lvm-single-lock and
> the user mheder for it, that would be great!
> I would start committing into it some time in January.
>
I've just created the repo (
https://github.com/OpenNebula/addon-shared-lvm-single-lock) but I can not
find the user mheder in github. Is it spelled right?
Cheers
>
> Cheers!
> Mihály
>
>
> On 18 December 2013 15:03, Javier Fontan <jfontan at opennebula.org> wrote:
>
>> Hi Nicolas,
>>
>> Sorry for the huge delay. Releasing a new version does not bring down the
>> amount of work :/
>>
>> Do you want me to create the repo for the new addon? I can use the name "addon-shared-lvm-single-lock"
>> and add your user "nagius" as admin to the repo.
>>
>> Cheers
>>
>>
>> On Tue, Dec 3, 2013 at 6:16 PM, Nicolas AGIUS <nicolas.agius at lps-it.fr>wrote:
>>
>>> Hi,
>>>
>>> Maybe, you should have a look at the CXM project [1] and the CXM driver
>>> [2]..
>>>
>>> It's a little bit old now, but it has been designed to work with cLVM on
>>> XEN hosts, and provide load-balancing and automatic failover.
>>>
>>> It can also work without cLVM. In this setup, Opennebula is not part of
>>> the cLVM cluster, all Xen nodes are read-writing LVM metadatas. That's
>>> working good, but it's dangerous and slower.
>>>
>>> Cheers,
>>> Nicolas AGIUS
>>>
>>> [1] https://github.com/nagius/cxm
>>> [2] http://opennebula.org/software:ecosystem:cxm_drivers
>>>
>>>
>>> --------------------------------------------
>>> En date de : Mar 3.12.13, Jaime Melis <jmelis at opennebula.org> a écrit :
>>>
>>> Objet: Re: [one-dev] announcing addon plan: shared-lvm-single-lock
>>> À: "Mihály Héder" <mihaly.heder at sztaki.mta.hu>
>>> Cc: dev at lists.opennebula.org, cc at hbit.sztaki.hu
>>> Date: Mardi 3 décembre 2013, 12h24
>>>
>>> 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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>>
>>
>>
>> --
>> Javier Fontán Muiños
>> Developer
>> OpenNebula - The Open Source Toolkit for Data Center Virtualization
>> www.OpenNebula.org | @OpenNebula | github.com/jfontan
>>
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>>
>
--
Javier Fontán Muiños
Developer
OpenNebula - The Open Source Toolkit for Data Center Virtualization
www.OpenNebula.org | @OpenNebula | github.com/jfontan
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