<p><br>
On Dec 15, 2011 10:22 AM, "Felix Frank" <<a href="mailto:ff@mpexnet.de">ff@mpexnet.de</a>> wrote:<br>
><br>
> Hi,<br>
><br>
> On 12/15/2011 05:09 PM, Trey Dockendorf wrote:<br>
> > Thanks for the input. Your right in that 2 days is too little time to<br>
> > do this, so I'm going to manual route of shutting one server down at a<br>
> > time, migrating the virtual disks then bringing it back up on the remote<br>
> > site.<br>
><br>
> I had thought the QCow images were on one disk. If there are indeed<br>
> several disks you can sync, yes, you can take that route.<br>
><br>
> > To avoid more downtime of manual migration once this is all over with, I<br>
> > think I will first attempt just getting a DRBD resource up and running<br>
> > to sync my servers back to the primary datacenter. Can a DRBD resource<br>
> > on an existing LVM be done without effecting the data ? Also since I<br>
><br>
> Yes, provided you can a) enlarge the LV a bit to use internal meta data<br>
> or b) have some extra space on both machines to create an external meta<br>
> data disk.<br>
><br>
> > don't plain to have automatic failover, any precautions I should take if<br>
> > the network connection is lost between the two datacenters ? Ideally<br>
> > this would allow me to have minimal downtime while the nodes re-sync.<br>
><br>
> Resyncing does not require downtime. Migrating the VMs to the other DRBD<br>
> peer needs downtime, and it's always brief.<br>
><br>
> I cannot think of any required precautions.<br>
><br>
> So the actual plan is to migrate the VMs before the connection is lost?<br>
> Great, this way you get away with an (arbitrarily long) quicksync once<br>
> the link returns and once that's finished, you can migrate back at your<br>
> leisure.<br>
><br>
> Cheers,<br>
> Felix</p>
<p>All the qcow images are in pools located on the same logical volume.</p>
<p>Your correct. The plan is to migrate before the fiber repair and network outage then sync them back with DRBD.</p>
<p>The meta space, does it have to be stored separate from the replicated LVM? I have a few 100 GBs left on that device.</p>
<p>Thanks<br>
- Trey</p>