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<div class="moz-cite-prefix">On 12/30/2015 06:42 AM, Ravishankar N
wrote:<br>
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<blockquote cite="mid:56832F8F.1060105@redhat.com" type="cite">
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<div class="moz-cite-prefix">On 12/30/2015 04:20 AM, Kyle Harris
wrote:<br>
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cite="mid:CAO5ZC7Egc=E49KOFxecQFUgwxD+rcoTiYOyQEcNsCQ-ncuRdKQ@mail.gmail.com"
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<div style="font-size:13px">Hello All,</div>
<div style="font-size:13px"><br>
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<div style="font-size:13px">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: <a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="https://www.gluster.org/pipermail/gluster-users/2015-August/023030.html">https://www.gluster.org/pipermail/gluster-users/2015-August/023030.html</a>.</div>
<div style="font-size:13px"><br>
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This is not implemented yet Kyle. We are targetting it for 3.8.<br>
<blockquote
cite="mid:CAO5ZC7Egc=E49KOFxecQFUgwxD+rcoTiYOyQEcNsCQ-ncuRdKQ@mail.gmail.com"
type="cite">
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<div style="font-size:13px">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? </div>
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<br>
See this thread <a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="https://www.gluster.org/pipermail/gluster-users/2015-October/023915.html">https://www.gluster.org/pipermail/gluster-users/2015-October/023915.html</a>
for more information. Client quorum is a better way to avoid
split-brain of files.<br>
Arbiter is a type of replicate volume which uses client quorum (
plus some arbitration logic) to avoid split-brains.<br>
<blockquote
cite="mid:CAO5ZC7Egc=E49KOFxecQFUgwxD+rcoTiYOyQEcNsCQ-ncuRdKQ@mail.gmail.com"
type="cite">
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<div style="font-size:13px"> </div>
<div style="font-size:13px"><br>
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<div style="font-size:13px">Second, I noticed at the following
URL where is discusses this new functionality it says, and I
quote "<i>By default, client quorum (cluster.quorum-type) is
set to auto . . ."</i> 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?</div>
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</blockquote>
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 (<a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="http://review.gluster.org/#/c/11872/">http://review.gluster.org/#/c/11872/</a>).<br>
</blockquote>
client-quorum is set to auto only for 3 way replication. For 2 way
replication there is no quorum.<br>
<br>
Pranith<br>
<blockquote cite="mid:56832F8F.1060105@redhat.com" type="cite"> <br>
-Ravi<br>
<blockquote
cite="mid:CAO5ZC7Egc=E49KOFxecQFUgwxD+rcoTiYOyQEcNsCQ-ncuRdKQ@mail.gmail.com"
type="cite">
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<div style="font-size:13px"><i><br>
</i></div>
<div style="font-size:13px">Arbiter Link</div>
<div style="font-size:13px"><a moz-do-not-send="true"
href="https://github.com/gluster/glusterfs/blob/release-3.7/doc/features/afr-arbiter-volumes.md"
target="_blank">https://github.com/gluster/glusterfs/blob/release-3.7/doc/features/afr-arbiter-volumes.md</a><br>
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<div style="font-size:13px"><br>
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<div style="font-size:13px">Thank you.</div>
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