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<div class="moz-cite-prefix">On 09/11/17 05:01,
<a class="moz-txt-link-abbreviated" href="mailto:fernandocmachado@yahoo.com.br">fernandocmachado@yahoo.com.br</a> wrote:<br>
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<p class="MsoNormal">Hello everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m trying to implemente the following
scenario:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">4 servers running KVM virtual machines and
1 server as a backup of the 4 servers.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m trying to implemente the DRBD to
replicate the data block changed from the 4 server to this
backup server, but I don’t know how to do that, since all the
“Howtos” on the internet applies only for 2 nodes replication.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Could anyone help me on this?<o:p></o:p></p>
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Yes.<br>
<br>
I could add more, but then it probably wouldn't be helpful. On the
other hand, you could add more information about your environment
and it would definitely be helpful.<br>
What version of DRBD are you using?<br>
How many copies of the "data blocks" do you want? If it one copy on
one of the 4 servers plus one copy on the "backup" server?<br>
What is the storage capacity of the 4 servers and the backup?<br>
<br>
OK, I'll add some hints...<br>
If using DRBD 8.4:<br>
For each of the four servers, configure DRBD together with the
backup server. The backup server will need 4 x storage capacity of
the other servers, you will end up with 2 copies of all data. Best
to use LVM to create one LV for each remote server, and then use
DRBD to connect these.<br>
<br>
If using DRBD9:<br>
Just setup DRBD as normal on all 5 nodes, and then use drbdmanage to
ensure one copy is on the "backup" node and however many copies you
need are on the other 4 nodes. Possibly, you want 5 copies of data,
so all machines have a full copy of all data, but probably 5 copies
of data is going to cause you a lot of problems.<br>
<br>
In either case, keep in mind that the backup server is going to need
enough ethernet bandwidth as well as disk IOPS to be able to write
all data changes from all 4 nodes. This could massively reduce your
overall disk IOPS. You should test carefully prior to deployment.<br>
<br>
If you do provide more information, then me or someone else can
likely provide more detailed/helpful advice.<br>
<br>
Regards,<br>
Adam
<div class="moz-signature">-- <br>
Adam Goryachev
Website Managers
<a class="moz-txt-link-abbreviated" href="http://www.websitemanagers.com.au">www.websitemanagers.com.au</a></div>
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