I've created some graphs with trending data. They will show the date at which
capacity will hit 100%. This is working well, however if the trend line has
a negative slope it will display the "expiration" date as the time epoch
12/31/69.
I've been trying different RPN statements to print either "Indefinite" or
even nothing at all in the place of the date... but have had no luck. I was
hoping someone could offer a clever suggestion.
On the rrdtool gallery page there is a graph that does what I want, so I
know it can be done.
Here's my graph options (its copied from a perl script so ignore the $vars):
DEF:cpu_in_use=$rrd_dir/$host.rrd:cpu_in_use:AVERAGE
DEF:total_cpu=$rrd_dir/$host.rrd:total_cpu:AVERAGE
DEF:cpu_in_use_lt=$rrd_dir/$host.rrd:cpu_in_use:AVERAGE:start=$start:end=$end_lt
DEF:total_cpu_lt=$rrd_dir/$host.rrd:total_cpu:AVERAGE:start=$start:end=$end_lt
CDEF:cpu_free=total_cpu_lt,cpu_in_use_lt,-
CDEF:percent_used=cpu_in_use_lt,100,*,cpu_in_use_lt,cpu_free,+,/
AREA:percent_used#00aa0b:"CPU Percent Used"
VDEF:m=percent_used,LSLSLOPE
VDEF:b=percent_used,LSLINT
CDEF:trend=percent_used,POP,m,COUNT,*,b,+
LINE1:trend#ffff33:"Trend"
CDEF:sub=trend,100,101,LIMIT # get the portion of the trend line between 100
and 101
VDEF:intersection=sub,FIRST # get the FIRST point on that line
GPRINT:intersection:"\nCapacity Expiration date is %B %d, %Y\l:strftime"
GPRINT:m:"SLOPE %lf"
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