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<p>Hi <br>
</p>
<p>I hope this is the right place to ask what may be a silly
question. I have searched the archives and still do not
understand properly how to set up "classic 3 node" for DR.</p>
<p>I have been using a simple HA setup for some years now for KVM
virtual machines. I have a DRBD resource for each VM, backed by
LVM volumes, each using a unique IP (aliases) via CAT5 directly
connecting dedicated NICs on each of "alice" and "bob" (I'm using
the example from the docs here for simplicity). I run half the
guests on each host and manually fail over if it is ever needed.
This has been rock solid for me, great performance and has on more
than one occasion saved my bacon. I want to set up a classic 3
node DR with a VPN connected off site 3rd stacked node.<br>
</p>
<p>Referring to this <a moz-do-not-send="true"
href="http://docs.linbit.com/docs/users-guide-8.4/#s-three-nodes">http://docs.linbit.com/docs/users-guide-8.4/#s-three-nodes</a>
6.18.2. Configuring a stacked resource</p>
<p>I don't understand where to set up the interface for the stacked
resource:</p>
<pre class="highlight"><code class="language-drbd" data-lang="drbd">stacked-on-top-of r0 {
device /dev/drbd10;
address 192.168.42.1:7788;
}</code></pre>
<div class="moz-signature">
<p>What interface gets this IP? I am assuming it goes on the
primary node of the lower resource. So for the example in the
docs, if alice is the primary I set up 192.168.42.1:7789 on
alice and if I have to switch bob to primary I loose replication
to charlie until such time as I either restore alice as the
primary or can I set up 192.168.42.1:7789 on bob somehow and
continue off site replication while alice is down?</p>
<p>As I am reading it bob has no "knowledge" of charlie and the
upper resource can only function while alice is primary. Is
that right?<br>
</p>
<p>Sorry if this is explained somewhere and I missed it.</p>
<p>regards<br>
</p>
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<p><b>Paul O'Rorke</b><br>
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