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<div class="moz-cite-prefix">On 07/15/2015 10:54 PM, Scott Harvanek
wrote:<br>
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<blockquote cite="mid:55A6973E.4090504@login.com" type="cite">
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Using the virt group which does-<br>
<br>
cluster.quorum-type: auto<br>
cluster.server-quorum-type: server<br>
<br>
And from my understanding this means that quorum enforcement is
enabled, and that it's brick related so if I only have two bricks
then I cannot achieve 51% and split brain is likely even with a
third node in the pool. If I move to fixed 1, then the likelihood
of splitbrain is high.<br>
</blockquote>
<br>
In a replica 2 setup, if you set cluster.quorum-type to auto, you
can avoid split-brains in AFR. But the first brick must be up at all
times.<br>
-Ravi<br>
<blockquote cite="mid:55A6973E.4090504@login.com" type="cite">
<br>
So what do I do here, get a fourth node and do distributed
replicated? Trying to find the best performance option while
minimizing split brain potential and I'm stuck with 3.6 clients (
RHEV-H ) so the aforementioned arbiter is out, Replica 3 just
seems to be a pig on the client side due to the triple write.<br>
<br>
<div class="moz-signature">-- <br>
Scott H.<br>
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</span><br>
<blockquote style="border: 0px none;"
cite="mid:55A693BA.9020004@redhat.com" type="cite">
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<font color="#9FA2A5"><span style="padding-left:6px">July
15, 2015 at 1:09 PM</span></font></div>
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<br>
On 07/15/2015 09:22 PM, Scott Harvanek wrote:
<br>
<blockquote type="cite">I saw Ravi mention something earlier
about the new arbiter volumes in 3.7
<br>
<br>
- Can you run a arbiter 3.7 server volume with 3.6 clients?
Or does this not work?
<br>
<br>
<br>
</blockquote>
<br>
Unfortunately, no. This is because the logic for the feature
is mostly in the AFR translator which is loaded on the client
process (with some minor logic in the arbiter translator
loaded on the brick process). So both clients and servers need
to be 3.7.
<br>
<br>
<br>
<blockquote type="cite">Quorum question -
<br>
<br>
- 3.6 server and clients, replica 2, however there's three+
servers in the cluster ( gluster pool list ). If one of the
replicas fail is quorum maintained via the other servers in
the cluster even though they are not part of the volume?
<br>
<br>
</blockquote>
That would depend on what type of quorum is enabled (client or
server side). Each type has a different impact. You can look
for the meaning of cluster.quorum-type, cluster.quorum-count
(these are client side quorum options, applicable only to
replicate volumes) and cluster.server-quorum-type,
cluster.server-quorum-ratio (these are server side quorum
options; they are not specific to replicate volumes) in
'gluster volume set help`.
<br>
<br>
HTH,
<br>
Ravi
<br>
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<font color="#9FA2A5"><span style="padding-left:6px">July
15, 2015 at 11:52 AM</span></font></div>
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<div style="color:#888888;margin-left:24px;margin-right:24px;"
__pbrmquotes="true" class="__pbConvBody">I saw Ravi mention
something earlier about the new arbiter volumes in 3.7
<br>
<br>
- Can you run a arbiter 3.7 server volume with 3.6 clients?
Or does this not work?
<br>
<br>
<br>
Quorum question -
<br>
<br>
- 3.6 server and clients, replica 2, however there's three+
servers in the cluster ( gluster pool list ). If one of the
replicas fail is quorum maintained via the other servers in
the cluster even though they are not part of the volume?
<br>
<br>
</div>
</blockquote>
<br>
</blockquote>
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