[DRBD-user] DRBD spontaneously loses connection

Fabrizio Zelaya FZelaya at ta-petro.com
Thu Dec 10 15:27:36 CET 2015

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

Thank you Lars and Adam for your recommendations.

I have ping-timeout set to 5 and it still happened.

Lars with this fencing idea. I have been contemplating this, however I am 
rebuilding servers which are already in place,  All the configuration 
related to cman and drbd  was literally copied and pasted from the old 

Is this concept of having dual-primary without fencing being a 
mis-configuration something new?

I ask this because as you would imagine by now, the old servers are 
working with the exact same configuration and have no problems at all. And 
while your idea makes perfect sense it would also make sense to have the 
exact same problem on every version of drbd.

There is a difference to be consider I guess. I am now installing this 
servers using SL6 as you saw in my original email, the old servers are 
working with Debian 6.0.7

The old servers are running  drbd8-utils  2:8.3.7-2.1 

Thank you

Fabrizio Zelaya 
Linux Systems Administrator
TravelCenters of America
(O): (440) 808-4412
(M):(216) 470-3356
fzelaya at ta-petro.com

From:   Lars Ellenberg <lars.ellenberg at linbit.com>
To:     drbd-user at lists.linbit.com
Date:   12/10/2015 08:06 AM
Subject:        Re: [DRBD-user] DRBD spontaneously loses connection
Sent by:        drbd-user-bounces at lists.linbit.com

On Sat, Dec 05, 2015 at 07:17:22PM -0800, Adam Randall wrote:
> Try setting ping-timeout to 5

Which would be the default.
But yes, because of the message "PingAck did not arrive in time",
at least this may be the right tunable.

But the real mis-configuration is that you apparently try to run
dual-primary without any fencing at all.

Without fencing, you get to keep the pieces.

Without fencing, any replication link hickup results in data divergence,
aka a "split brain" scenario. You really want to avoid that.

: Lars Ellenberg
| Your Way to High Availability
: DRBD, Linux-HA  and  Pacemaker support and consulting

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