Fwd: [DRBD-user] Redundancy

Bob Goldberg bobg.hahc at gmail.com
Mon Jul 21 20:43:20 CEST 2008

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


Sorry - probably should have replied this to the group:

---------- Forwarded message ----------
From: Bob Goldberg <bobg.hahc at gmail.com>
Date: Jul 21, 2008 1:41 PM
Subject: Re: [DRBD-user] Redundancy
To: "nathan at robotics.net" <nathan at robotics.net>

On 7/19/08, nathan at robotics.net <nathan at robotics.net> wrote:
>
>
> Is it possible to specify more then one IP address in a DRBD config? I just
> ran into a nasty split brain scenario that I did not think about.
>
> I am using infiniband between my two hosts and my infiniband cable was
> disconnected. Cluster MANager was still running on the gigabit ethernet
> interface, so nothing was fenced even tho DRBD was partitioned because of
> lack of infiniband IPoIB interface.
>
>
FYI/FWIW:

you can't do this with drbd - but you CAN if you're using HA (high
availability).

w/ HA, you basically have a cluster which can be addressed like:
server 1: 192.168.0.2
server 2: 192.168.0.3

HA cluster (in HA's conf file) designates the above 2 servers can be
addressed via:
HAcluster: 192.168.0.5

so regardless of which server is up, and servicing your drbd partition, the
resource is addressed via the cluster's IP, not either of the server's IP's.

ie: mount 192.168.0.5:/drbdShare /mnt

HTH - Bob
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