On 03/30/2016 01:33 AM, André Bauer wrote:
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?
Again, the term 'arbiter' is used to refer to a type of replica-3 volume
in gluster parlance (at least until another feature comes that uses the
same terminology ;-) ). A replica-2 configuration does not have an
'arbiter'.
Imho 4 nodes should be enough to get proper quorum even if only replica
2 is used.
There are both client and server quorums in gluster.
http://gluster.readthedocs.org/en/latest/Administrator%20Guide/arbiter-volumes-and-quorum/
has more information.
Thanks,
Ravi
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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