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 <stirabos@redhat.com> wrote:
On Tue, Jul 11, 2017 at 7:17 AM, TranceWorldLogic . < tranceworldlogic@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
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