Re: Arbiter and geo-replication

Ravishankar N <ravishankar@xxxxxxxxxx> · Fri, 22 Sep 2017 06:21:50 +0530



    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@xxxxxx>
                          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

                               
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                        -- 

                        
                            Thanks and Regards,

                            
                            Kotresh H R

                          
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