Should I consider that there is no use of Quorum on 2 node. I need to setup odd :) nodes only.
Please clarify same. Thanks, ~Rohit On Tue, Jul 11, 2017 at 12:57 PM, Simone Tiraboschi <stira...@redhat.com> wrote: > > > On Tue, Jul 11, 2017 at 7:17 AM, TranceWorldLogic . < > tranceworldlo...@gmail.com> wrote: > >> Hi, >> >> I was trying to setup hosted engine on 2 host machine but it not allowing >> to setup hosted engine on 2 node gluster file system. >> >> I have also modified vdsm.com to allow 2 replica count. >> >> But latter I found in code it is hard coded to 3 as shown below: >> ------------------- ------------------------------- >> ------------------------------ --------------- >> src/plugins/gr-he-setup/storage/nfs.py >> >> if* replicaCount != '3'*: >> raise RuntimeError( >> _( >> 'GlusterFS Volume is not using replica 3' >> ) >> ) >> ------------------- ------------------------------- >> ------------------------------ --------------- >> >> Can I get to know the reason to hard coded to 3 ? >> from online I got to know that split brain issue not get resolve >> automatically using 2 node gluster setup. But please let me know more (why >> 3 ? why not 2 or 4 ?) >> > > Simply because two is even and three is odd. > > In a split condition over only two nodes, if node A says A and nodes B > says B you cannot decide if the truth is A or B. > With three nodes, if node says A but nodes B AND nodes C says B, the truth > is B by design. > That's why you need three nodes with at least 2 of them up and working. > > If you want to save something on storage side you could evaluate two > regular nodes plus an arbiter one. > > >> >> If I am missing something please let me know. >> Also want to understand, can quorum can solve 2 node gluster issue >> (split-brain) ? >> >> Thanks, >> ~Rohit >> >> >> _______________________________________________ >> Users mailing list >> Users@ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >> >> >
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