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<p>Hi Igor!<br>
</p>
<div class="moz-cite-prefix">Am 24.02.2017 um 23:56 schrieb Igor
Cicimov:<br>
</div>
<blockquote
cite="mid:CAAKASGx+wm=a-PoJ87+TVnvQet-yd_NLtuLXSW--3DBRv4grOQ@mail.gmail.com"
type="cite">
<div dir="ltr">Hi Volker,<br>
<div>
<div class="gmail_extra"><br>
<div class="gmail_quote"><br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF"> resource vm-100-disk-1 {<br>
template-file "/var/lib/drbd.d/drbdmanage_<wbr>global_common.conf";<br>
<br>
net {<br>
allow-two-primaries yes;<br>
</div>
</blockquote>
<div><br>
</div>
<div>Dual-primary mode is not supported for 9.0 see <a
moz-do-not-send="true"
href="https://www.drbd.org/en/doc/users-guide-90/s-dual-primary-mode">https://www.drbd.org/en/doc/users-guide-90/s-dual-primary-mode</a><br>
</div>
</div>
</div>
</div>
</div>
</blockquote>
Thanks for this hint. I missed that completely. But ...<br>
<br>
While it is not recommended by linbit it works perfectly. We did
live migration under full throttle (While Debian Desktop
installation, 100MB/s writes Peak) with very good performance and no
problems at all. We use the drbd9-packages from the linbit proxmox
repository, so this findings may only hold for this release:<br>
<br>
root@proxmox-1:~# cat /proc/drbd<br>
version: 9.0.5-1 (api:2/proto:86-112)<br>
GIT-hash: 8d53d3e73f85f8d98f100a0127ccb574a97c5f64 build by
root@elsa, 2016-12-09 11:15:55<br>
Transports (api:14): tcp (1.0.0)<br>
<br>
<br>
Also we learned that the weak sync performance we have reported only
ocures at the initial DRBD synchronisation. After synchonisation
everything is as fast as expected.<br>
<br>
So IMHO the dual-primary should be not the reason for the slow
initial sync.<br>
<br>
Cheers,<br>
<br>
Volker<br>
<br>
<pre class="moz-signature" cols="72">--
=========================================================
inqbus Scientific Computing Dr. Volker Jaenisch
Richard-Strauss-Straße 1 +49(08861) 690 474 0
86956 Schongau-West <a class="moz-txt-link-freetext" href="http://www.inqbus.de">http://www.inqbus.de</a>
=========================================================</pre>
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