On 03/04/2016 05:26 PM, Pranith Kumar Karampuri wrote:
hi,
So far default quorum for 2-way replication is 'none' (i.e.
files/directories may go into split-brain) and for 3-way replication
and arbiter based replication it is 'auto' (files/directories won't go
into split-brain). There are requests to make default as 'auto' for
2-way replication as well. The line of reasoning is that people value
data integrity (files not going into split-brain) more than HA
(operation of mount even when bricks go down). And admins should
explicitly change it to 'none' when they are fine with split-brains in
2-way replication. We were wondering if you have any inputs about what
is a sane default for 2-way replication.
I like the default to be 'none'. Reason: If we have 'auto' as quorum
for 2-way replication and first brick dies, there is no HA.
+1. Quorum does not make sense when there are only 2 parties. There is
no majority voting. Arbiter volumes are a better option.
If someone wants some background, please see 'Client quorum' and
'Replica 2 and Replica 3 volumes' section of
http://gluster.readthedocs.org/en/latest/Administrator%20Guide/arbiter-volumes-and-quorum/
-Ravi
If users are fine with it, it is better to use plain distribute volume
rather than replication with quorum as 'auto'. What are your thoughts
on the matter? Please guide us in the right direction.
Pranith
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