Hello Ravi, Thank you for the explanation! Now it is clear
Best regards, Alexandr On Sat, Nov 26, 2016 at 3:07 PM, Ravishankar N <[email protected]> wrote: > On 11/26/2016 04:54 PM, Alexandr Porunov wrote: > > Hello, > > I am using GlusterFS 3.8.5. I wonder to know when to use Arbiter volumes > and quorum options in GlusterFS and what difference between them? > > I tried to achive a split-brain in a replicated voulume 3 but couldn't. > Does GlusterFS manage split-brain situations automaticaly? > > I tried following: > node1, node2, node3 is the nodes with a replicated volume. > I have created a network crash between node1 and node3 but node1 and node3 > still can speak with node2. When I write a file to node1 it automatically > creates on node2 and node3. When I write a file to node3 it automaticaly > creates on node2 and node1. > > I tried to crash node1 then write to node3 and then crash a node3 and > recover node1. Still it works just fine. I tried to crash two nodes and > then write to the healthy node and it doesn't work. After I have run one > more node it started work. > > Is it possible to achive a split-brain in a GlusterFS cluster 3.8.5? If > yes then how and what options we have to set to prevent split-brain? If no > then why do we need an arbiter and quorum options? > > > Split-brains are possible in replica-2 volumes. They don't occur in > replica-3 volumes or arbiter-volumes. Client-quorum is enabled and set to > 'auto' when you create replica-3 or arbiter vols. You're not supposed to > change it. Arbiter vols can be used if you want to avoid split-brains but > don't want to invest in a 3rd data brick for replica-3. Of course, the > availability of arbiter is less compared to replica-3 because we don't > store the actual file content in the 3rd (arbiter) brick. > > You can find more information @ http://gluster.readthedocs.io/ > en/latest/Administrator%20Guide/arbiter-volumes-and-quorum/ and > http://events.linuxfoundation.org/sites/events/files/slides/ > glusterfs-arbiter-VAULT-2016.pdf > > Regards, > Ravi > > Sincerely, > Alexandr > > > _______________________________________________ > Gluster-users mailing > [email protected]http://www.gluster.org/mailman/listinfo/gluster-users > > >
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