[Gluster-users] Conflict resolution

[Strahil Nikolov]

Hi David,
You can obtain the values via 'gluster volume get' command. See 'gluster volume get help'.The defaults are also defined and can be seen via 'gluster volume set help'. I think that the quorum ratio in replica 3 is '51'.
With cluster.server-quorum-type set to 'server', the TSP nodes are creating a 'quorum'  and when node3 is disconnected from the majority (quorum), the brick of node3 will shutdown till quorum is restored.
For point 3 , you need to check cluster.quorum-type. If it's set in auto mode , only the  first brick will allow writes (I think we are talking about replica 2 here) . Yet, if you configered the volume that it allows both bricks to be operational (cluster.quorum-type = fixed, cluster.quorum-count =1, volume is replica 2), then:A) yesB) no, it should just healC) no, it should just heal
The conflict protection from arbiter is the same (we both use extended file attributes on arbiter and full data brick). If a file was not properly updated on node2, both bricks (node1+ node3 ) will 'blame' node2 and thus the heal daemon (if enabled) will try to heal that file.

 Best Regards,Strahil Nikolov
 
  On Wed, Oct 20, 2021 at 3:52, David Cunningham<dcunningham at voisonics.com> wrote:   Hello,
I've a few questions about conflict resolution in a net-split scenario:
1. What are the default values for cluster.server-quorum-type and cluster.server-quorum-ratio? (at the moment "gluster volume info gvol0" does not report either)
2. If there are 3 mirrored nodes and cluster.server-quorum-ratio is 50, and node1 and node2 are net-split from node3, then am I right in thinking that the volume on node3 will automatically shut down and prevent access thus preventing a conflict?
3. If there are 2 mirrored nodes and a net-split happens and cluster.server-quorum-ratio is 50 then:a) If existing file A is changed on node1 and node2 then the file will enter net-split state, right?b) If existing file B is changed on node1 but not node2 then will the file enter a net-split state?c) If new file C is written on node1 but not node2 then will the file enter a net-split state?

4. Is the outcome of conflict resolution at a file level the same whether node3 is a full replica or just an arbiter?

Thank you very much for any advice,

-- 
David Cunningham, Voisonics Limited
http://voisonics.com/
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