[Gluster-users] Arbiter vs Dummy Node Details

[Pranith Kumar Karampuri]

On 12/30/2015 06:42 AM, Ravishankar N wrote:
> On 12/30/2015 04:20 AM, Kyle Harris wrote:
>> Hello All,
>>
>> Forgive the duplicate but I forgot to give the first post a title so 
>> this corrects that. Anyway, I recently discovered the new arbiter 
>> functionality of the 3.7 branch so I decided to give it a try.  First 
>> off, I too am looking forward to the ability to add an arbiter to an 
>> already existing volume as discussed in the following thread: 
>> https://www.gluster.org/pipermail/gluster-users/2015-August/023030.html.
>>
> This is not implemented yet Kyle. We are targetting it for 3.8.
>> However, my first question for now is can someone perhaps go into a 
>> bit of detail regarding the difference between using this new arbiter 
>> functionality versus adding a dummy node with regards to helping to 
>> eliminate split-brain?  In other words, a bit of information on which 
>> is best and why?
>
> See this thread 
> https://www.gluster.org/pipermail/gluster-users/2015-October/023915.html 
> for more information. Client quorum is a better way to avoid 
> split-brain of files.
> Arbiter is a type of replicate volume which uses client quorum ( plus 
> some arbitration logic)  to avoid split-brains.
>>
>> Second, I noticed at the following URL where is discusses this new 
>> functionality it says, and I quote "/By default, client quorum 
>> (cluster.quorum-type) is set to auto . . ."/ which I found to be a 
>> bit confusing.  After setting up my new cluster I noticed that none 
>> of the quorum settings including cluster.quorum-type seem to have a 
>> setting?
> The client-quorum is indeed enabled and set to auto; it is just that 
> the `volume info` output does not display it correctly.  It being 
> fixed (http://review.gluster.org/#/c/11872/).
client-quorum is set to auto only for 3 way replication. For 2 way 
replication there is no quorum.

Pranith
>
> -Ravi
>> /
>> /
>> Arbiter Link
>> https://github.com/gluster/glusterfs/blob/release-3.7/doc/features/afr-arbiter-volumes.md
>>
>> Thank you.
>>
>>
>>
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>
>
>
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