[rrd-users] RRA + graph help

[Anuj Jain]

Hi

Thats how i make my rrd

 

rrdtool create test.rrd –start now() –step 15

DS:DS1from:GAUGE:30:0:65536

DS:DS1to:GAUGE:30:0:65536

DS:DS2from:GAUGE:30:0:65536

DS:DS2to:GAUGE:30:0:65536

DS:DS3from:GAUGE:30:0:65536

DS:DS3to:GAUGE:30:0:65536

RRA:MAX:0.5:1:240

RRA:MAX:0.5:20:288

RRA:MAX:0.5:2400:876

 

The Ist RRA for 1 hour (240*15=3600 sec)

The 2nd RRA for  1 day ( 288*15*20=68400 sec)

The 3rd RRA for 1 year (876*15*2400=31536000 sec)

now() is function which give the epoch time

 

rrdtool graph test.jpg –start -1h –height 220

--width 600 –vertic-bale=”(from/to)”

--alt-autoscale –title=”TEST graph”

DEF:pfrm=test.rrd:DS1from:MAX

DEF:pto=test.rrd:DS1to:MAX

LINE:pto#CF0000

LINE:pfrm#00001

 

Questions:

   As rrd is expecting values only after the 15 sec, so what will happen if it get values more than once in that cycle? 

Lets say I update rrd every 2 sec  

rrd update test.rrd now():0:0:10:12:3:4

rrd update test.rrd now():0:0:11:13:4:5

rrd update test.rrd now():0:0:12:14:5:6

rrd update test.rrd now():0:0:13:15:6:7

rrd update test.rrd now():0:0:14:16:7:8

rrd update test.rrd now():0:0:15:17:8:9

rrd update test.rrd now():0:0:16:18:9:10

rrd update test.rrd now():0:0:17:19:10:11

rrd update test.rrd now():0:0:18:20:11:12

rrd update test.rrd now():0:0:19:21:12:13

 

            So what will be the values stored in RRD for DS2from, DS2to, DS3from, DS3to?

 

   The 2nd RRA which stores data for 1 day that 20*15=300 sec which is 5 min.

How the rrd saves the values? Does it store the max of those 20pdp or the last value etc?

I want to store the sum, so is it possible to do that.

 

 3.  When I plot the graph it does not show any data, just a blank graph.



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