[DRBD-user] Connectivity question

Greg Haase haaseg at onefreevoice.com
Tue Dec 18 22:29:04 CET 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Actually, I found this link on Florian's blog about dopd:

... Which subsequently has a link to this page:

... Which describes exactly as you say.  eth1, eth0 and serial.  I have
just got  mcast setup on eth0 to accompany bcast on eth1 and done the dopd
configs. I'm going to do some testing with this setup and see what
happens.  I haven't explored creating a serial connection on a virtual
machine, but I never seem to have luck with serial connections in general
(thinking minicom) so I'm a little hesitant to go there.

> I'm doing something similar and although I'm pretty new at this I'm
> gathering the best setup would be to have heartbeat running over both
> eth0 and eth1 as well as providing a serial connection.  That way if the
> drbd link goes down, the peer-outdater program can use one of the other
> heartbeat paths/links to outdate the secondary and keep heartbeat from
> using it.
> On Tue, 2007-12-18 at 10:03 -0500, Greg Haase wrote:
>> I'm playing around with a drbd + mysql setup, and I had some questions
>> about how the servers should be connected.
>> I currently have two virtual machines running, each with two ethernet
>> ports. On each machine eth0 is Bridged - so it's connected to our
>> development subnet. The  eth1 ports are both on a private network within
>> VM (VMnet5). I think that's the best way I can simulate a
>> cross-connected
>> cable between servers on eth1. I have both heartbeat bcast and drbd
>> working over eth1.
>> I've had this working for a while and I've been testing various
>> fail-over
>> situations.
>> The one thing I've noticed is that pretty much all hell breaks loose if
>> I
>> take down eth1 on either of the servers. While I would admit in a real
>> situation it is unlikely that anything should happen here, it can be a
>> point of failure.
>> What are the best ways of address this? Is my setup lacking?
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