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<div class="moz-cite-prefix">On 07/03/2017 06:53 PM, yayo (j) wrote:<br>
</div>
<blockquote
cite="mid:CAGK=3kwU7VbyQjLyvG5TS0LtozOkBpGidOsBYeoyp_eOapTB6g@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_extra">Hi,</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">And sorry for delay</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">2017-06-30 14:09 GMT+02:00 knarra <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:knarra@redhat.com" target="_blank">knarra@redhat.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">To <span class="il">add</span>
a fully replicated <span class="il">node</span> you
need to reduce the replica count to 2 and <span
class="il">add</span> new brick to the volume so that
it becomes replica 3. Reducing replica count by removing
a brick from replica / arbiter cannot be done from UI
currently and this has to be done using <span
class="il">gluster</span> CLI. <br>
AFAIR, there was an issue where vm's were going to
paused state when reducing the replica count and
increasing it to 3. Not sure if this still holds good
with the latest release. <br>
<br>
Any specific reason why you want to move to <span
class="il">full</span> replication instead of using an
arbiter <span class="il">node</span> ?<span class=""><br>
<br>
</span></div>
</blockquote>
<div><br>
</div>
<div>We have a new server with the same hard disk size of
other two node, so, why not? Why join the cluster as an
arbiter when we can have the same disk capacity to add
extra replication? </div>
<div><br>
</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"><span class=""> <br>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_extra">and remove the arbiter
<span class="il">node</span> (Also a way to
move the arbiter role to the new <span
class="il">node</span>, If needed) </div>
</div>
</div>
</blockquote>
</span> To move arbiter role to a new <span class="il">node</span>
you can move the <span class="il">node</span> to
maintenance , <span class="il">add</span> new <span
class="il">node</span> and replace old brick with new
brick. You can follow the steps below to do that.<br>
<br>
<ul>
<li>Move the <span class="il">node</span> to be
replaced into Maintenance mode</li>
<li>Prepare the replacement <span class="il">node</span></li>
<li>Prepare bricks on that <span class="il">node</span>.</li>
<li>Create replacement brick directories</li>
<li>Ensure the new directories are owned by the vdsm
user and the kvm group.</li>
<li># mkdir /rhgs/bricks/engine</li>
<li># chmod vdsm:kvm /rhgs/bricks/engine</li>
<li># mkdir /rhgs/bricks/data</li>
<li># chmod vdsm:kvm /rhgs/bricks/data</li>
<li>Run the following command from one of the healthy
cluster members:</li>
<li># <span class="il">gluster</span> peer probe
<new_node></li>
<li> <span class="il">add</span> the new host to the
cluster.</li>
<li><span class="il">Add</span> new host address to <span
class="il">gluster</span> network</li>
<li>Click Network Interfaces sub-tab.</li>
<li>Click Set up Host Networks.</li>
<li>Drag and drop the glusternw network onto the IP
address of the new host.</li>
<li>Click OK</li>
<li>Replace the old brick with the brick on the new
host</li>
<li>Click the Bricks sub-tab.</li>
<li>Verify that brick heal completes successfully.</li>
<li>In the Hosts tab, right-click on the old host and
click Remove.</li>
<li>Clean old host metadata</li>
<li># hosted-engine --clean-metadata
--host-id=<old_host_id> --force-clean</li>
</ul>
<span class=""> <br>
</span></div>
</blockquote>
<div><br>
</div>
<div>I need this (reads: I need the arbiter role) if I
reduce replica count then I add the new node as full
replica and increasing replica count again to 3? (As you
expained above)</div>
<div><br>
</div>
</div>
</div>
</div>
</blockquote>
Above steps hold good if you want to move the arbiter role to a new
node.<br>
<br>
If you want to move to full replica, reducing the replica count will
work fine but increasing it again back to 3 might cause vm pause
issues.<br>
<br>
<br>
<br>
<br>
<blockquote
cite="mid:CAGK=3kwU7VbyQjLyvG5TS0LtozOkBpGidOsBYeoyp_eOapTB6g@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">
<div>Thank you</div>
</div>
</div>
</div>
</blockquote>
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