[rrd-users] blank data

[Nate Johnson]

I am having a little trouble learning how to use rrdtool, and was hoping
for a little assistance.  I want to track three numbers on a server: open
ftp sessions, open sftp sessions, and open ssh login sessions.

Here is how I created my database:

 rrdtool create \
 connections.rrd --step 60 \
 DS:ftpsessions:GAUGE:120:0:U \
 DS:sftpsessions:GAUGE:120:0:U \
 DS:logins:GAUGE:120:0:U \
 RRA:AVERAGE:0.5:1:50400 \
 RRA:AVERAGE:0.5:60:43800

Here is how I am updating my database every 60 seconds

 rrdtool update connections.rrd N:${ftpsessions}:${sftpsessions}:${logins}

And here is a sample of the last 10 minutes:

 #rrdtool fetch connections.rrd AVERAGE -s -600
               ftpsessions  sftpsessions        logins

 1042582260: 1.0000000000e+00 0.0000000000e+00 0.0000000000e+00
 1042582320: 1.0000000000e+00 0.0000000000e+00 0.0000000000e+00
 1042582380: 1.0000000000e+00 0.0000000000e+00 0.0000000000e+00
 1042582440: 1.0000000000e+00 0.0000000000e+00 0.0000000000e+00
 1042582500: 1.0000000000e+00 0.0000000000e+00 0.0000000000e+00
 1042582560: 1.0000000000e+00 0.0000000000e+00 0.0000000000e+00
 1042582620: 1.0000000000e+00 0.0000000000e+00 0.0000000000e+00
 1042582680: 1.0000000000e+00 0.0000000000e+00 0.0000000000e+00
 1042582740: 1.0000000000e+00 0.0000000000e+00 0.0000000000e+00
 1042582800: 1.0000000000e+00 0.0000000000e+00 0.0000000000e+00
 1042582860: NaNQ NaNQ NaNQ
 1042582920: NaNQ NaNQ NaNQ

The numbers that I am expecting to see in the rrd are more like:

 TIME: 13 8 13
 TIME: 26 24 46
 TIME: etc...

I am generating the integers with a shell script, and then pluging them in
- you saw the variables above.  Why do I seem to get the same entries
every 60 seconds?  I am *very* new to this.  Please forgive me if the
answer is obvious.  Any advice would be great.

Thanks,
Nate

-- 
* Nate Johnson, UITS SysAdmin
* natejohn at indiana.edu

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