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Re: [Cinder] Re: Multiple machines hosting cinder-volumes with Folsom ?


Thanks Jerome for the clarification.
I just posted out a blogpost for adding a Second volume to Cinder in Folsom [3]. Maybe it could be merged with the official Folsom Ubuntu Cinder documentation ? There is only H/A aspects that are mentioned by now.

Someone from the documentation team ? Could you please point me out some materials for committing a new doc for that ?


[3] : http://sbauza.wordpress.com/2013/06/03/adding-a-second-cinder-volume-with-folsom/

Le 31/05/2013 14:26, Jérôme Gallard a écrit :
Hi Sylvain,

Great to know that you found how to solve your issue.

Thanks for reporting that you found the Grizzly doc confusing.
In fact, the Grizzly release introduced the multi-backend feature. This feature allows to have more than one backend on a same compute (ie, to be able to have several cinder-volume running on a same compute). This feature is not available in Folsom: you can only run one cinder-volume per compute (in that case, if you want to manage several backends, you have to have several computes).

Thanks a lot for your remarks,

On Fri, May 31, 2013 at 1:55 PM, Sylvain Bauza <sylvain.bauza@xxxxxxxxxxxx <mailto:sylvain.bauza@xxxxxxxxxxxx>> wrote:

    Thanks but it didn't match my needs. I already know how to deploy
    Cinder on a single host, my point was more relative to deploying a
    second Cinder-volume instance, and if yes, what to do.

    Nevermind, I successed in deploying a second Cinder-volume, just
    by looking at the packages and the confs. It's pretty
    straightforward, so I'm not surprised it wasn't documented.
    Nevertheless, I think that the Grizzly doc I mentioned [1] is
    confusing : by looking at it, I was thinking Cinder was unable to
    have two distinct volumes with Folsom release. Maybe updating the
    folsom branch for Cinder documentation, precising it *is*
    possible, is worth a try ?

    Anyway, I'm documenting out the process in my own (new) blog. Keep
    tuned, I'll post the URL out there.


    Le 31/05/2013 11:39, Jérôme Gallard a écrit :
    Hi Sylvain,

    Maybe the folsom documentation for cinder will help you:


    On Fri, May 31, 2013 at 9:21 AM, Sylvain Bauza
    <sylvain.bauza@xxxxxxxxxxxx <mailto:sylvain.bauza@xxxxxxxxxxxx>>

        Putting openstack-ops@ in the loop :-)

        Le 30/05/2013 17:26, Sylvain Bauza a écrit :

            Le 30/05/2013 15:25, Sylvain Bauza a écrit :


                It sounds quite unclear for me about the possibility
                *in Folsom* to have two distinct Cinder hosts having
                each one LVM backend called cinder-volumes ?

                As per the doc [1], I would say the answer is no, but
                could you please confirm ?

                If so, do you have any idea on how to trick a nearly
                full LVM cinder-volumes VG ? (I can't hardly add a
                new disk for adding a second PV).


                [1] :

            Replying to myself. As per [2], it seems having a
            multiple cinder-volume setup in Folsom is achiveable.
            Could someone from Cinder confirm that this setup is OK ?

            [2] : https://lists.launchpad.net/openstack/msg21825.html

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