[Gluster-users] Convert replica 2 to replica 3 arbiter 1

[Russell Purinton]

I have used the add-brick command in the past but I’m not sure how to go about using it to do this…

Could anyone provide an example?

As shown below, the current setup, xs141 is replica with xs138.  xs139 is replica with xs140.  I would like to have 139 serve as arbiter for 141 and 138.   And I’d like 141 to serve as arbiter for 139 and 140.

> On Mar 29, 2016, at 1:07 PM, Atin Mukherjee <atin.mukherjee83 at gmail.com> wrote:
> -Atin
> Sent from one plus one
> On 29-Mar-2016 10:21 pm, "Russell Purinton" <russell.purinton at gmail.com <mailto:russell.purinton at gmail.com>> wrote:
> >
> > I have several existing volumes configured in the following way:
> >
> > Volume Name: sonic001
> > Type: Distributed-Replicate
> > Volume ID: 362eb3a8-c211-4f35-bcd3-87785c51f15c
> > Status: Started
> > Number of Bricks: 4 x 2 = 8
> > Transport-type: tcp
> > Bricks:
> > Brick1: xs141:/brick1/sonic001p0r0
> > Brick2: xs138:/brick1/sonic001p0r1
> > Brick3: xs139:/brick1/sonic001p1r0
> > Brick4: xs140:/brick1/sonic001p1r1
> > Brick5: xs141:/brick0/sonic001p2r0
> > Brick6: xs138:/brick0/sonic001p2r1
> > Brick7: xs139:/brick0/sonic001p4r0
> > Brick8: xs140:/brick0/sonic001p3r1
> >
> > I recently learned that replica 2 can’t be considered HA because of the split brain scenario that would occur if a network partition occurred.   I also recently learned that using replica 3 arbiter 1 was a way to solve this problem without consuming additional space.
> >
> > Is there a way I can change this existing volume to be replica 3 arbiter 1, or do I need to create new volumes and rsync the data?
> 
> I think you should be able to convert the volume topology using add-brick command.
> 
> >
> > Thanks,
> >
> > Russ
> >
> > _______________________________________________
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> > Gluster-users at gluster.org <mailto:Gluster-users at gluster.org>
> > http://www.gluster.org/mailman/listinfo/gluster-users <http://www.gluster.org/mailman/listinfo/gluster-users>
> -Atin
> Sent from one plus one
> 

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