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<div class="moz-cite-prefix">On 04/09/14 00:33, Vijaykumar Koppad
wrote:<br>
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cite="mid:CAC1pKAVFoURsKuuj5a2C1+crSWG3jTWvECw2AvkXHiU9DipR9w@mail.gmail.com"
type="cite">
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<div class="gmail_quote">On Wed, Sep 3, 2014 at 8:20 PM, M S
Vishwanath Bhat <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:vbhat@redhat.com"
target="_blank">vbhat@redhat.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
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<div class="">On 01/09/14 23:09, Paul Mc Auley wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
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Hi Folks,<br>
<br>
Bit of a query on the process for setting this up and
the best practices for same.<br>
<br>
I'm currently working with a prototype using 3.5.2 on
vagrant and I'm running into assorted failure modes
with each pass.<br>
<br>
The general idea is I start with two sites A and B
where A has 3 bricks used to build a volume vol at
replica 3 and<br>
B has 2 bricks with at replica 2 to also build vol.<br>
I create 30 files is A::vol and then set up
geo-replication from A to B after which I verify that
the files have appeared in B::vol.<br>
What I want to do then is double the size of volumes
(presumably growing one and not the other is a bad
thing)<br>
by adding 3 bricks to A and 2 bricks to B.<br>
<br>
I've had this fail number of ways and so I have a
number of questions.<br>
<br>
Is geo-replication from a replica 3 volume to a
replica 2 volume possible?<br>
</blockquote>
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Yes. geo-replication just needs two gluster volumes
(master -> slave). It doesn't matter what configuration
master and slave has. But slave should be big enough to
have all the data in master.
<div class=""><br>
<blockquote class="gmail_quote" style="margin:0 0 0
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Should I stop geo-replication before adding additional
bricks? (I assume yes)<br>
</blockquote>
</div>
There is no need to stop geo-rep while adding more bricks
to the volume.
<div class=""><br>
<blockquote class="gmail_quote" style="margin:0 0 0
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Should I stop the volume(s) before adding additional
bricks? (Doesn't _seem_ to be the case)<br>
</blockquote>
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No.
<div class=""><br>
<blockquote class="gmail_quote" style="margin:0 0 0
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Should I rebalance the volume(s) after adding the
bricks?<br>
</blockquote>
</div>
Yes. After add-brick, rebalance should be run.
<div class=""><br>
<blockquote class="gmail_quote" style="margin:0 0 0
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Should I need to recreate the geo-replication to
push-pem subsequently, or can I do that out-of-band?<br>
...and if so should I have to add the passwordless SSH
key back in? (As opposed to the restricted secret.pem)<br>
For that matter in the inital setup is it an expected
failure mode that the initial geo-replication create
will fail if the slave host's SSH key isn't known?<br>
</blockquote>
</div>
After the add-brick, the newly added node will not have
any pem files. So you need to do "geo-rep create push-pem
force". This will actually push the pem files to the newly
added node as well. And then you need to do "geo-rep start
force" to start the gsync processes in newly added node.<br>
<br>
So the sequence of steps for you will be,<br>
<br>
1. Add new nodes to both master and slave using gluster
add-brick command.<br>
</blockquote>
<div>After this, we need to run "gluster system:: execute
gsec_create " on master node and then proceed with step 2.</div>
</div>
</div>
</div>
</blockquote>
Yeah. Missed it... Sorry :)<br>
<br>
The pem files needs to be generated for the newly added nodes before
pushing them to slave. Above command does that.<br>
<blockquote
cite="mid:CAC1pKAVFoURsKuuj5a2C1+crSWG3jTWvECw2AvkXHiU9DipR9w@mail.gmail.com"
type="cite">
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<blockquote class="gmail_quote" style="margin:0 0 0
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2. Run geo-rep create push-pem force and start force.<br>
3. Run rebalance.<br>
<br>
Hope this works and hope it helps :)<br>
<br>
<br>
Best Regards,<br>
Vishwanath
<div class="HOEnZb">
<div class="h5"><br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0
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<br>
Thanks,<br>
Paul<br>
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