[rrd-users] RRD Graph downward to 0 date prediction

[Alexander von Gluck IV]

On , Steve Shipway wrote:
>> Hm, this doesn't help any. Now I do get a date, but it is just the end
> date of
>> the graph...
> ...
>> options.push("DEF:#{c}=#{rrdfile}:#{c}:MIN")
>> options.push("VDEF:#{c}slope=#{c},LSLSLOPE")
>> options.push("VDEF:#{c}int=#{c},LSLINT")
>> options.push("CDEF:#{c}avg=#{c},POP,#{c}slope,COUNT,*,#{c}int,+")
>> options.push("CDEF:#{c}limit=#{c}avg,0,2000000000000,LIMIT")
>> options.push("VDEF:#{c}warning=#{c}avg,MINIMUM")
>> options.push("GPRINT:#{c}warning:    2TB free @ %c\\l:strftime")
>> 
> 
> You are using the wrong cdef in your warning definition!  So, of course 
> you
> get the end time of the graph...
> 
> options.push("VDEF:#{c}warning=#{c}limit,MINIMUM")
> 
> Define your warning on the limited CDEF.  Now, #{c}limit becomes 
> unknown
> when #{c}avg drops below 0.  Therefore, the minimum value of 
> #{c}warning
> must be 0 (if it reaches 0) and so the strftime for this point will be 
> the
> time it hits 0.

No luck, now I'm back where I started :-)  warning / strftime is "-"

options.push("--end", "now+#{range}", "--start", "now-#{range}")
options.push("--vertical-label", "Space Available")
options.push("DEF:#{c}=#{rrdfile}:#{c}:MIN")
options.push("VDEF:#{c}slope=#{c},LSLSLOPE")
options.push("VDEF:#{c}int=#{c},LSLINT")
options.push("CDEF:#{c}avg=#{c},POP,#{c}slope,COUNT,*,#{c}int,+")
options.push("CDEF:#{c}limit=#{c}avg,0,2000000000000,LIMIT")
options.push("VDEF:#{c}warning=#{c}limit,MINIMUM")
options.push("LINE4:#{c}#{get_color(index)}:#{c}")
options.push("LINE1:#{c}avg#{get_color(index)}cc::dashes=6");
options.push("GPRINT:#{c}:LAST:Available\\: %7.2lf %s\\l")
options.push("GPRINT:#{c}warning:    2TB free @ %c\\l:strftime")

Thanks!

  -- Alex