[DRBD-user] BarrierAck errors on my DRBD

[Lars Ellenberg]

On Thu, Sep 15, 2011 at 11:14:53AM +0200, Michael Schwartzkopff wrote:
> > On Thu, Sep 15, 2011 at 10:29:47AM +0200, Michael Schwartzkopff wrote:
> > > Hi,
> > > 
> > > After fixing an other error I started to see the following error on my
> > > DRBD:
> > > 
> > > kernel: block drbd0: BAD! BarrierAck #2778697761 received, expected
> > > #2778697760!
> > > 
> > > Can anybody explain what the BarrierAck error means?
> > > What is the cause of the problem?
> > > How to solve the problem?
> > 
> > DRBD version,
> 
> 8.3.10

The in-tree or the out-of-tree thing?

> > kernel version,
> 
> 2.6.39.3
> 
> > what "other error",
> 
> Since we have a quite limited test setup with virtual machines I saw lots of
> 
> kernel: block drbd0: PingAck did not arrive in time.
> 
> I solved that problem
> - limiting sync to 1M
> - setting ping-int to 30 (seconds)
> - setting ping-timeout to 20 (1/10th of seconds, i.e. 2 sec)
> 
> > what did you do to trigger this,
> 
> Nothing. It happens about twice per hour.
> 
> > can you easily reproduce, etc.
> 
> Yes. That is the annoying problem.
> 
> > Most likely: Upgrade.
> 
> From kernel 2.6.39 to?