[rrd-users] Graph per month - is it possible?

[Maris Janis Vasilevskis]

Thank you, Tobi.

But I do not use expressions anywhere in real tasks.
I placed expressions in code samples to make the text readable.
In my real experiments, only numbers (values of these expressions) are used.

Mahris

Tobias Oetiker wrote 2011.04.03. 14:04:
> Hi Maris,
>
> Today Maris Janis Vasilevskis wrote:
>
>> In following excerpts, I use dates and expressions for readability.
>> In reality, I use only numbers - seconds for step, seconds from epoch for start and end.
>>
>> rrdtool create test.rrd --step 1 --start -2year DS:cpu:GAUGE:600:0:100
>> RRA:AVERAGE:0.5:24*3600:720
>> There are also RRAs for week, hour and minute.
>> To be safe about last year data, I filled database with test values for 2 years (update with step 10 secs).
>>
>> rrtool graph --end now --start end-14month
>> DEF:avr4=test.rrd:cpu:AVERAGE:step=30*24*3600:start=1Apr2010:end=1May2010
>> LINE:avr4#FF0000
>> DEF:avr5=test.rrd:cpu:AVERAGE:step=31*24*3600:start=1May2010:end=1Jun2010
>> LINE:avr5#FF0000
>> ...
>>
>> I get results for some months only, most part of graph is empty.
>
> cool idea ... but you can not have math expression in the step
> argument, so you must calculte them externally.
>
> cheers
> tobi