[Gluster-users] Automatic arbiter volumes on distributed/replicated volumes with replica 2?

[André Bauer]

Am 24.03.2016 um 13:56 schrieb Ravishankar N:
> On 03/24/2016 04:30 PM, André Bauer wrote:
>> So if you have a 4 node cluster is it realy needed to have a third
>> replica? Imho the 2 of the nodes could also be used as arbiters?
> I'm not sure I understand. The 'arbiter' volume is a special type of
> replica volume where the 3rd brick of that replica (for every replica)
> only holds metadata. So if you're asking if this brick itself can be
> co-located on a node which holds the other 'data' bricks of the volume,
> then yes that is possible.

My Question is:

If i have 4 Nodes and use replica 2, why should i need to add 2 more
arbiter nodes, when i also have 2 (distributed) nodes which could do the
arbiter job automaticly?

Imho 4 nodes should be enough to get proper quorum even if only replica
2 is used.

Regards
André

> -Ravi
>>
>> Does it make sense to open a feature request in the bugtracker?
>>
>> Regards
>> André
>>
>> Am 24.03.2016 um 11:02 schrieb Ravishankar N:
>>> On 03/24/2016 02:39 PM, André Bauer wrote:
>>>> Hi List,
>>>>
>>>> we just upgraded out 4 node cluster from 3.5.8 to 3.7.8.
>>>>
>>>> Because of replica 2 on all volumes i run into problems with read only
>>>> file systems of vm images when running on 3.5.x. As i know now the
>>>> solution would be to have replica 3 or at least use arbiter volumes.
>>>>
>>>> Yesterday i stumbled over this post in the list which i missed before
>>>> (damn spam filter):
>>>>
>>>> https://www.gluster.org/pipermail/gluster-users/2015-November/024191.html
>>>>
>>>>
>>>> Steve Dainard is pointing out that 3.7.x uses an automatic arbiter,
>>>> when
>>>> you have 4 nodes configured as distributed/replicated.
>>>>
>>>> Is this true? Could not find something about it in the documentation
>>>> :-/
>>> There is no 'automatic' arbiter for replica 2. I think he was referring
>>> to the dummy node peer probed for maintaining server quorum.
>>> -Ravi
>>>> Would be nice i could save on having 2 more nodes this way.
>>>>
>>>> If not, is there a chance to see such feature in the future?
>>>>
>>>>
>>>
>>>
>>
> 
> 
> 


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André Bauer

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André Bauer
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