[rrd-users] I need help with my rrd file

[Andy Riebs]

OK,

A few more problems here...

1. It's a good bet that the following isn't doing what you think it is:

	>  a=0
	>  while [ $a!=0 ]; do

   You probably meant to do

	a=1
	while [ $a -ne 0 ]; do

   Though I will concede that the following would also work:

	a=1
	while [ $a !=  0 ]; do

   or
	a=0
	while [ $a = 0 ]; do

2. You appear to have the rrd set up for 300 second (5 minute) intervals; 
for how long are you collecting your samples?  There are a couple of  
conditions that you'll have to meet before useful results are available.

Consider the following times, in order, given your loop:

	a. First sample is taken
	b. First time()%300 threshold is passed; the
	   start of a measurement interval begins
	c. Second time()%300 threshold is passed
	d. Another sample is taken, rrd can now determine
	   the value for the interval from (b) to (c)

So, given your loop with samples every 30 seconds, it could take nearly 11 
minutes before a single result can be reported:
	- The interval between (a) and (b) could be as
	  much as 299 seconds
	- The interval between (b) and (c) will be
	  exactly 300 seconds
	- The interval between (c) and (d) could be as
	  much as 30 seconds

Make sense?
/andy

On Monday 29 September 2008 09:19:07 am alucard95 wrote:
> So, this is the final script which is running :
>
>  #!/bin/sh
>  a=0
>  while [ $a!=0 ]; do
> input=$(snmpget -Oqv -v2c -c public xxx.xxx.xxx.xxx
> 1.3.6.1.2.1.2.2.1.10.4)
>
> output=$(snmpget -Oqv -v2c -c public xxx.xxx.xxx.xxx
> 1.3.6.1.2.1.2.2.1.16.4)
>
> echo $input:$output
>
> # I can use N as a replacement for the current time
> $(rrdtool update /home/zabbix/switch.rrd N:$input:$output)
>
> # sleep 30 seconds
> sleep 30
>
> # end of while loop
> done
>
> the result of the echo is good, but the last problem (i hope :-() is
> when i do a rrd fetch, the result is :
>
> 1222693200: nan nan
> 1222693500: 0.0000000000e+00 0.0000000000e+00
> 1222693800: 0.0000000000e+00 0.0000000000e+00
> 1222694100: nan nan
>
> why it is not the good number??
> --
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>
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-- 
Andy Riebs,  HP Scalable Computing and Infrastructure / Linux R&D
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