Gluster users - Jan 2018 - Replacing a third data node with an arbiter one

On Fri, Jan 26, 2018 at 7:05 AM, Ravishankar N <ravishankar at redhat.com>
wrote:
>
>
> On 01/24/2018 07:20 PM, Hoggins! wrote:
>
> Hello,
>
> The subject says it all. I have a replica 3 cluster :
>
>     gluster> volume info thedude
>
>     Volume Name: thedude
>     Type: Replicate
>     Volume ID: bc68dfd3-94e2-4126-b04d-77b51ec6f27e
>     Status: Started
>     Snapshot Count: 0
>     Number of Bricks: 1 x 3 = 3
>     Transport-type: tcp
>     Bricks:
>     Brick1: ngluster-1.network.hoggins.fr:/export/brick/thedude
>     Brick2: ngluster-2.network.hoggins.fr:/export/brick/thedude
>     Brick3: ngluster-3.network.hoggins.fr:/export/brick/thedude
>     Options Reconfigured:
>     cluster.server-quorum-type: server
>     transport.address-family: inet
>     nfs.disable: on
>     performance.readdir-ahead: on
>     client.event-threads: 8
>     server.event-threads: 15
>
>
> ... and I would like to replace, say ngluster-2 with an arbiter-only
> node, without any data. Is that possible ? How ?
>
> Yes, you would need to reduce it to replica 2 and then convert it to
> arbiter.
> 1. Ensure there are no pending heals, i.e. heal info shows zero entries.
> 2. gluster volume remove-brick thedude replica 2
> ngluster-3.network.hoggins.fr:/export/brick/thedude force
> 3. gluster volume add-brick thedude replica 3 arbiter 1 <IP:brick path
of
> the new arbiter brick>
>
Would it be good to have this small sequence of steps noted down
somewhere other than a mailing list archive? I imagine this is going
to be sought out by a few more users choosing this course.

On Fri, 2018-01-26 at 07:12 +0530, Sankarshan Mukhopadhyay
wrote:
> On Fri, Jan 26, 2018 at 7:05 AM, Ravishankar N <ravishankar at redhat.co
> m> wrote:
> > 
> > On 01/24/2018 07:20 PM, Hoggins! wrote:
> > 
> > Hello,
> > 
> > The subject says it all. I have a replica 3 cluster :
> > 
> >     gluster> volume info thedude
> > 
> >     Volume Name: thedude
> >     Type: Replicate
> >     Volume ID: bc68dfd3-94e2-4126-b04d-77b51ec6f27e
> >     Status: Started
> >     Snapshot Count: 0
> >     Number of Bricks: 1 x 3 = 3
> >     Transport-type: tcp
> >     Bricks:
> >     Brick1: ngluster-1.network.hoggins.fr:/export/brick/thedude
> >     Brick2: ngluster-2.network.hoggins.fr:/export/brick/thedude
> >     Brick3: ngluster-3.network.hoggins.fr:/export/brick/thedude
> >     Options Reconfigured:
> >     cluster.server-quorum-type: server
> >     transport.address-family: inet
> >     nfs.disable: on
> >     performance.readdir-ahead: on
> >     client.event-threads: 8
> >     server.event-threads: 15
> > 
> > 
> > ... and I would like to replace, say ngluster-2 with an arbiter-
> > only
> > node, without any data. Is that possible ? How ?
> > 
> > Yes, you would need to reduce it to replica 2 and then convert it
> > to
> > arbiter.
> > 1. Ensure there are no pending heals, i.e. heal info shows zero
> > entries.
> > 2. gluster volume remove-brick thedude replica 2
> > ngluster-3.network.hoggins.fr:/export/brick/thedude force
> > 3. gluster volume add-brick thedude replica 3 arbiter 1 <IP:brick
> > path of
> > the new arbiter brick>
> > 
> 
> Would it be good to have this small sequence of steps noted down
> somewhere other than a mailing list archive? I imagine this is going
> to be sought out by a few more users choosing this course.
+1!!!
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://lists.gluster.org/mailman/listinfo/gluster-users
-- 
James P. Kinney III

Every time you stop a school, you will have to build a jail. What you
gain at one end you lose at the other. It's like feeding a dog on his
own tail. It won't fatten the dog.
- Speech 11/23/1900 Mark Twain

http://heretothereideas.blogspot.com/
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On 01/26/2018 07:32 AM, Jim Kinney wrote:
>> Would it be good to have this small sequence of steps noted down
>> somewhere other than a mailing list archive? I imagine this is going
>> to be sought out by a few more users choosing this course.
>
> +1!!!
Considering we are planning to modify the syntax for gluster 4.0, I will 
update the doc as a part of that. I have made a note at 
https://github.com/gluster/glusterd2/issues/515.

-Ravi
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