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

[Atin Mukherjee]

-Atin
Sent from one plus one
On 29-Mar-2016 10:43 pm, "Russell Purinton" <russell.purinton at gmail.com>
wrote:
>
> 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.

I don't think that's possible. IIRC, the last brick in the replica pair is
considered to be an arbiter brick and I am not aware of any changes in the
behaviour post that. So in short, if you execute add-brick then all the new
bricks will be considered as arbiter IMO.

Ravi can correct me otherwise.
>
>> 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>
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
>> >
>> > _______________________________________________
>> > Gluster-users mailing list
>> > Gluster-users at gluster.org
>> > http://www.gluster.org/mailman/listinfo/gluster-users
>>
>> -Atin
>> Sent from one plus one
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.gluster.org/pipermail/gluster-users/attachments/20160329/5da5815f/attachment.html>