<div dir="ltr"><div>yes, if you are using drbd in master/slave, first promote the resource to master and then start vm on the node, if you use drbd in multimaster, only start the vm when drbd is started.<br><br></div><div>Use SAN, with multipath.<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-07-18 16:34 GMT+02:00 Lentes, Bernd <span dir="ltr"><<a href="mailto:bernd.lentes@helmholtz-muenchen.de" target="_blank">bernd.lentes@helmholtz-muenchen.de</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
<br>
----- On Jul 17, 2017, at 11:51 AM, Bernd Lentes <a href="mailto:bernd.lentes@helmholtz-muenchen.de">bernd.lentes@helmholtz-<wbr>muenchen.de</a> wrote:<br>
<br>
> Hi,<br>
><br>
> i established a two node cluster with two HP servers and SLES 11 SP4. I'd like<br>
> to start now with a test period. Resources are virtual machines. The vm's<br>
> reside on a FC SAN. The SAN has two power supplies, two storage controller, two<br>
> network interfaces for configuration. Each storage controller has two FC<br>
> connectors. On each server i have one FC controller with two connectors in a<br>
> multipath configuration. Each connector from the SAN controller inside the<br>
> server is connected to a different storage controller from the SAN. But isn't a<br>
> SAN, despite all that redundancy, a SPOF ?<br>
> I'm asking myself if a DRBD configuration wouldn't be more redundant and high<br>
> available. There i have two completely independent instances of the vm.<br>
> We have one web application with a databse which is really crucial for us.<br>
> Downtime should be maximum one or two hours, if longer we run in trouble.<br>
> Is DRBD in conjuction with a database (MySQL or Postgres) possible ?<br>
><br>
><br>
> Bernd<br>
><br>
<br>
Is with DRBD and Virtual Machines live migration possible ?<br>
<br>
<br>
Bernd<br>
<br>
<br>
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