[DRBD-user] BarrierAck errors on my DRBD

Michael Schwartzkopff misch at schwartzkopff.org
Thu Sep 15 11:14:53 CEST 2011


> 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

> 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?

Greetings,

-- 
Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München

Tel: (0163) 172 50 98
Fax: (089) 620 304 13
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