On 12/30/2015 06:42 AM, Ravishankar N wrote:
On 12/30/2015 04:20 AM, Kyle Harris wrote:
Hello All,
Forgive the duplicate but I forgot to give the first post a title so
this corrects that. Anyway, I recently discovered the new arbiter
functionality of the 3.7 branch so I decided to give it a try. First
off, I too am looking forward to the ability to add an arbiter to an
already existing volume as discussed in the following thread:
https://www.gluster.org/pipermail/gluster-users/2015-August/023030.html.
This is not implemented yet Kyle. We are targetting it for 3.8.
However, my first question for now is can someone perhaps go into a
bit of detail regarding the difference between using this new arbiter
functionality versus adding a dummy node with regards to helping to
eliminate split-brain? In other words, a bit of information on which
is best and why?
See this thread
https://www.gluster.org/pipermail/gluster-users/2015-October/023915.html
for more information. Client quorum is a better way to avoid
split-brain of files.
Arbiter is a type of replicate volume which uses client quorum ( plus
some arbitration logic) to avoid split-brains.
Second, I noticed at the following URL where is discusses this new
functionality it says, and I quote "/By default, client quorum
(cluster.quorum-type) is set to auto . . ."/ which I found to be a
bit confusing. After setting up my new cluster I noticed that none
of the quorum settings including cluster.quorum-type seem to have a
setting?
The client-quorum is indeed enabled and set to auto; it is just that
the `volume info` output does not display it correctly. It being
fixed (http://review.gluster.org/#/c/11872/).
client-quorum is set to auto only for 3 way replication. For 2 way
replication there is no quorum.
Pranith
-Ravi
/
/
Arbiter Link
https://github.com/gluster/glusterfs/blob/release-3.7/doc/features/afr-arbiter-volumes.md
Thank you.
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