[DRBD-user] BarrierAck errors on my DRBD

Michael Schwartzkopff misch at schwartzkopff.org
Thu Sep 15 12:54:58 CEST 2011


> 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?

In-tree.

We have the options:
disk {
    no-disk-barrier;
    no-disk-flushes;
    no-disk-drain;
  }

and 
mount-options:  type ext4 (rw,noatime,data=writeback)

Should we use disk-barrier? Or the mount option nobarrier?

Thanks for your help.

-- 
Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München

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