On 10/18/2015 07:27 PM, Nicolas LIENARD wrote:
Hey Nil

What about https://gluster.readthedocs.org/en/release-3.7.0/Features/afr-arbiter-volumes/ ?


Le 18 octobre 2015 15:12:23 GMT+02:00, Nir Soffer <nsof...@redhat.com> a écrit :

    On Sat, Oct 17, 2015 at 12:45 PM, Nicolas LIENARD <glus...@distran.org> 

        Hi Currently, i ve 3 nodes, 2 in same DC and a third in
        another DC. They are all bridged together through a vpn. I
know a cluster is at least 3 nodes to satisfy the quorum.

Just adding a 3rd node (without actually using it for 3 way replication) might not help in preventing split-brains. gluster has client-quorum and server-quorum. Have a look at http://comments.gmane.org/gmane.comp.file-systems.gluster.user/22609 for some information.

If you are indeed using it as a replica-3, then it is better to have all 3 nodes in the same DC. gluster clients sends every write() to all bricks of the replica (and waits for their responses too), so if one of them is in another DC, it might slow writes due to network latency.

        My question is to know if i can have my VM balancing on the 2
fast nodes with HA and glusterfs replica 2.

replica 2 definitely provides HA but if you have more chances of files ending in split-brain if you have frequent network disconnects , which is why replica 3 with client-quorum set to 'auto' is better for preventing split-brains. arbiter-volumes are a kind of a sweet-spot between replica-2 and replica-3 that can prevent split-brains. The link that Nir shared describes it and how to create one etc.


    gluster replica 2 is not supported.


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