[hobbit] No graph for negative clock offset

[Ralph Mitchell]

Judging by the man page, negative values are OK.  The first entry in the
EXAMPLE section of "man rrdcreate" reads:

          rrdtool create temperature.rrd --step 300 \
             DS:temp:GAUGE:600:-273:5000 \
             RRA:AVERAGE:0.5:1:1200 \
             RRA:MIN:0.5:12:2400 \
             RRA:MAX:0.5:12:2400 \
             RRA:AVERAGE:0.5:12:2400

         This sets up an RRD called temperature.rrd which accepts one
tempera-
         ture value every 300 seconds. If no new data is supplied for more
than
         600 seconds, the temperature becomes *UNKNOWN*.  The minimum
acceptable
         value is -273 and the maximum is 5'000.

Ralph Mitchell


On Mon, Jul 28, 2008 at 9:24 AM, Ward, Martin <Martin.Ward at colt.net> wrote:

> Funnily enough I am looking at the Hobbit code that deals with RRD data
> at the moment. If you are using the NCV capabilities then it looks like
> you can't have negative numbers. The generic NCV (Number, Colon, Value)
> code looks for numbers only, no signs (somewhere near line 70 in
> hobbitd/rrd/do_ncv.c):
>
>                        val = l + strspn(l, " \t");
>                        l = val + strspn(val, "0123456789.");
>
> I have no idea if RRD is able to accept/store negative values, but if it
> is, it should be a simple case of adding the + and - characters to the
> last line listed above to make what you want possible.
>
> |\/|artin
>
> -----Original Message-----
> From: David Stuffle [mailto:david at stufflemail.com]
> Sent: 28 July 2008 14:28
> To: hobbit at hswn.dk
> Subject: [hobbit] No graph for negative clock offset
>
>
> Hi all,
> None of my clock offset graphs graph anything when the clock offset from
>
> a host is a negative number.  Only positive number work.  Anyone having
> the same thing happen or know how to fix?
>
> I'm running a snapshot 4.3.0-0.20080103
>
> Thanks
> David
>
>
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