Re: adding a node

Pierre Léonard <pleonard@xxxxxxxxxxxx> · Tue, 17 Mar 2015 11:48:35 +0100

Title: Signature electronique

    Hi JF,

      Hello Pierre,

I see your point and I understand your arguments. But as it happens, the
way you create your volumes has an impact on what you can do afterward,
and how you can expand them. *It has nothing to do with GlusterFS
itself, nor the developers or the community, it's all in your
architectural choices in the beginning.*

    Yes Theoretical you are right. Here at INRA, we are in a specific 
    unit  with a constant growing. But the budget is dedicated annually.

    So I have build three clusters dedicated to different type of
    computations and when the new plateform will need storage I have to
    either build a new cluster or by a complete set of Four node or
    seven node depending of my budget.

    Our unit is not in a data-center profile for the computation, the
    evolution is a continue process.

      It would be the same problem with many other distributed FS, or even
some RAID setups. That is the kind of thing that you have to think about
in the very beginning, and that will have consequences later.

    Yes, that's the reason we have a scratch zone dedicated for the
    computation and intermediate files, that is not secured all the user
    know that it's like your DD in your PC. And other volume secured
    with raid 5 and replica.

    I think that the choice ar good for three years, the time for us to
    get the first DD problems. 

      As for your 14-node cluster, if it's again a distributed+striped volume,
then it's a 2 × 7 volume (distributed over 2 brick groups, each being a
7-disk stripe). To extend it, you will have to add 7 more bricks to
create a new striped brick group, and your volume will be transformed
into a 3 × 7 one.

    OK that's better.

      I would advise you to read carefully the master documentation pertaining
to volume creation and architecture. Maybe it will help you understand
better the way things work and the impacts of your choices:

https://github.com/gluster/glusterfs/blob/master/doc/admin-guide/en-US/markdown/admin_setting_volumes.md

    I will.

    Many thanks for you and All.

    Sincerely.

    -- 

                    Pierre
                          Léonard

                    Senior
                          IT Manager

                    MetaGenoPolis

                    Pierre.Leonard@xxxxxxxxxxxx

                    Tél.
                        : +33 (0)1 34 65 29 78

                    Centre de recherche INRA 

                    Domaine de Vilvert – Bât.
                        325 R+1

                    78 352 Jouy-en-Josas CEDEX

                    France

                    www.mgps.eu

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