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 Peders?n
>
>
> --
>
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> *Marcus Peders?n*
> /System administrator/
>
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> Thanks and Regards,
> Kotresh H R
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