Hi all,
i had this problem (with different monitors) from time to time as well. Scots suggestion will do the trick by suppressing the negativ values to be displayed at the graphs, but has some drawbacks:
Keep in mind that the aggregation of values in rrd takes all numbers from rrd file into account. That means your wrong negative number will impact your overall graph also for the positive numbers in the history, and can lead to a more or less wrong graph (dependend how many and of which values you have for negatives). This can result in some kind of very false trends in the longer term history, and you will not see where this comes from...
That means: better would be to fix the root cause (as always).
Norbert
From: Scot Kreienkamp <Scot.Kreienkamp at la-z-boy.com> To: "xymon at xymon.com" <xymon at xymon.com> Date: 14/12/2016 16:22 Subject: [Xymon] Discarding Powershell client CPU negative values Sent by: "Xymon" <xymon-bounces at xymon.com>
Hi list,
I have a powershell client that is occasionally reporting negative values for CPU usage. Since that’s not possible I wanted to pass along this easy modification for load average in the graphs.cfg for any clients that want to get rid of the negative values on their graphs. This doesn’t remove them from the RRD, just discards values below 0 and above 1000 when generating the graph. Load cannot be negative so this may be something to include in the base configuration.
Here’s a diff:
36,37c36 < CDEF:la_min0=avg,100,/ < CDEF:la=la_min0,0,1000,LIMIT
CDEF:la=avg,100,/
And here’s what my graphs.cfg looks like now: [la] TITLE CPU Load YAXIS Load DEF:avg=la.rrd:la:AVERAGE CDEF:la_min0=avg,100,/ CDEF:la=la_min0,0,1000,LIMIT AREA:la#00CC00:CPU Load Average -u 1.0 GPRINT:la:LAST: \: %5.1lf (cur) GPRINT:la:MAX: \: %5.1lf (max) GPRINT:la:MIN: \: %5.1lf (min) GPRINT:la:AVERAGE: \: %5.1lf (avg)\n
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