[mrtg] negative counters SOLVED

Tyler J. Frederick tyler at sportsline.com
Mon Oct 1 19:06:45 MEST 2001

Gang... I think I solved it..

Upon reviewing the MRTG source code, it appears that all RRD's are created
with a minimum of zero.  This being the case, if anyone is querying
Checkpoint's mib, make sure you run an "rrdtool tune <file> -i
ds0:-100000000 -i ds1:-10000000" or something similar so it will handle
the negative numbers correctly.. Perhaps a "MinBytes" option in the next


Tyler J. Frederick
Systems Engineer/CCSE
Sportsline.com, Inc.

On Mon, 1 Oct 2001, Tyler J. Frederick wrote:

> More info on this one.. I did an ASCII dump of the RRD, and found that the
> negative numbers seem to be freaking out RRDtool.  Here's a snip from the
> XML it generates:
> <!--  PDP Status -->
> <last_ds>-1006303677</last_ds>
> <value>0.0000000000e+00</value>
> The value being 0 indicates to me that it doesn't seem to know how to
> handle the negative numbers (it should be the same, it's just subtraction)
> tf.

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