[Gluster-users] Arbiter and geo-replication

[Ravishankar N]

On 09/22/2017 02:25 AM, Kotresh Hiremath Ravishankar wrote:
> The volume layout of geo-replication slave volume could be different 
> from master volume.
> It's not mandatory that if the master volume is arbiter type, the 
> slave also needs to be arbiter.
> But if it's decided to use the arbiter both at master and slave, then 
> the expansion rules is
> applicable both at master and slave.
>
> Adding Ravi for arbiter related question
>
> On Thu, Sep 21, 2017 at 2:07 PM, Marcus <marcus.pedersen at slu.se 
> <mailto:marcus.pedersen at slu.se>> wrote:
>
>     Hi all!
>
>     Today I have a small gluster replication on 2 machines.
>     My plan is to scale this, I though need some feedback that how I
>     plan things is in the right direction.
>
>     First of all I have understood the need of an arbiter.
>     When I scale this, say that I just have 2 replica and 1 arbiter,
>     when I add another two machines can I still use the same physical
>     machine as the arbiter?
>     Or when I add additional two machines I have to add another
>     arbiter machine as well?
>


You can use the same physical machine for hosting multiple arbiter 
bricks. The general rule of brick placement is the same for any type of 
replica volume: No 2 bricks of the same replica subvolume should be on 
the same node.

Thanks,
Ravi

>
>     My second question is about geo-replication.
>     If I want to setup a geo-replication on above gluster cluster do I
>     need to have the exact "same" machines in the reo-replication?
>     I know that disk size should be same size on both the brick and on
>     the geo-replication side.
>     So if I have 2 replica and 1 arbiter, do I need 2 replica and 1
>     arbiter for the geo-replication?
>     Or is it sufficient for a 2 replica and 1 arbiter to use 1 replica
>     for the geo-replication?
>     What I wonder is when I scale my gluster with additional 2
>     machines, do I need 2 machines for geo-replication or 1 machine
>     for geo-replication?
>     So adding 2 machines means adding 4 machines in total or do I just
>     need 3 in total?
>     Is there a need for a arbiter in the geo-replication?
>
>     Many questions, but I hope that you can help me out!
>
>     Many thanks in advance!
>
>     Best regards
>     Marcus Pedersén
>
>
>     -- 
>     ------------------------------------------------------------------------
>     *Marcus Pedersén*
>     /System administrator/
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> -- 
> Thanks and Regards,
> Kotresh H R

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