4:42 p.m.
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On 07/03/2017 06:58 PM, knarra wrote:
On 07/03/2017 06:53 PM, yayo (j) wrote:
> Hi,
>
> And sorry for delay
>
> 2017-06-30 14:09 GMT+02:00 knarra <knarra(a)redhat.com
> <mailto:knarra@redhat.com>>:
>
> To add a fully replicated node you need to reduce the replica
> count to 2 and add 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 gluster CLI.
> 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.
>
> Any specific reason why you want to move to full replication
> instead of using an arbiter node ?
>
>
> 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?
>
>
>> and remove the arbiter node (Also a way to move the arbiter role
>> to the new node, If needed)
> To move arbiter role to a new node you can move the node to
> maintenance , add new node and replace old brick with new
> brick. You can follow the steps below to do that.
>
> * Move the node to be replaced into Maintenance mode
> * Prepare the replacement node
> * Prepare bricks on that node.
> * Create replacement brick directories
> * Ensure the new directories are owned by the vdsm user and the
> kvm group.
> * # mkdir /rhgs/bricks/engine
> * # chmod vdsm:kvm /rhgs/bricks/engine
> * # mkdir /rhgs/bricks/data
> * # chmod vdsm:kvm /rhgs/bricks/data
> * Run the following command from one of the healthy cluster
> members:
> * # gluster peer probe <new_node>
> * add the new host to the cluster.
> * Add new host address to gluster network
> * Click Network Interfaces sub-tab.
> * Click Set up Host Networks.
> * Drag and drop the glusternw network onto the IP address of
> the new host.
> * Click OK
> * Replace the old brick with the brick on the new host
> * Click the Bricks sub-tab.
> * Verify that brick heal completes successfully.
> * In the Hosts tab, right-click on the old host and click Remove.
> * Clean old host metadata
> * # hosted-engine --clean-metadata --host-id=<old_host_id>
> --force-clean
>
>
>
> 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)
>
Above steps hold good if you want to move the arbiter role to a new node.
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.
So, please
poweroff your vms while performing this.
> Thank you
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<div class="moz-cite-prefix">On 07/03/2017 06:58 PM, knarra
wrote:<br>
</div>
<blockquote
cite="mid:12869870-7d3a-1b80-4199-d336dfb8570c@redhat.com"
type="cite">
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
<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>
</blockquote>
So, please poweroff your vms while performing this.<br>
<blockquote
cite="mid:12869870-7d3a-1b80-4199-d336dfb8570c@redhat.com"
type="cite"> <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>
<p><br>
</p>
<br>
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<pre wrap="">_______________________________________________
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</pre>
</blockquote>
<p><br>
</p>
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