[rrd-users] Re: Get counter errors at reload switch, change my graph scale.

Alex van den Bogaerdt alex at ergens.op.het.net
Fri Jan 27 22:31:42 MET 2006

On Fri, Jan 27, 2006 at 09:17:27PM +0000, Diego Soares wrote:

> My switch is a FastEthernet switch, this invalid data
> originated from manual reload or clear Counters.

Sure, a well known issue.  It has been discussed many times,
this looks like a counterwrap to rrdtool.  Sufficiently low
limits should make it less likely that you suffer from this.

> Where is "modify its upper limits"? In the rrdcreate
> graph?

See manual page of rrdtool tune.

> I create my rrd file with this options:
> DS:ds0:COUNTER:500:0:100000000 \
> DS:ds1:COUNTER:500:0:100000000 \
> To limit the maximum rate to 100mb. This is correct??

Well, 100 mega-somethings.  I don't know if you put bits,
bytes, frames, nibbles, whatever into the database.

That should have worked, but clearly it didn't.  Either
the value was modified, did not make it into the database,
or perhaps you spotted a bug.

If you are sure that 100,000,000 upper limit is in place,
then never mind about rrdtool tune.

Alternatively you can modify COUNTER into DERIVE, and keep
that lower limit of zero.  You will never detect counter
wraps again, even real ones.


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