[DRBD-user] suffering from iowait

Mark Watts m.watts at eris.qinetiq.com
Fri Aug 15 10:56:24 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.

On Friday 15 August 2008 09:46:32 Wolfram Schlich wrote:
> * Mark Watts <m.watts at eris.qinetiq.com> [2008-08-15 09:51]:
> > On Thursday 14 August 2008 23:04:47 Wolfram Schlich wrote:
> > > [...]
> > > What could be the reason for both issues (iowait
> > > vs. load skyrocketing)?
> > >
> > > Thanks!
> >
> > If its like other Dell's, you should start by disabling the TCP
> > Offload (TOE) by removing the hardware key on the motherboard.
> Interesting... could you possibly be a little more verbose? :)
> Thanks!

Similar IO problems have been reported before (search the archives for TOE) 
and its been found that even if TCP Offload isn't enabled by the nic driver, 
the hardware key seems to enable it.

If you pop the lid on the server, you should find (if you server has TOE) a 
little RJ11 dongle you can remove to fully disable TOE.

I've done this on some 1950's and it solved my IO problems.



Mark Watts BSc RHCE MBCS
Senior Systems Engineer
QinetiQ Applied Technologies
GPG Key: http://www.linux-corner.info/mwatts.gpg
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