[rrd-users] Data not entering RRD, only "nan" values

[BigglesZX]

Hi all,

I'm trying to graph packet and byte counts from iptables, but all I
get is "nan" in the RRD.

I used this command to create the RRD:

> rrdtool create chatter.rrd --start N DS:packets:GAUGE:60:0:U DS:bytes:GAUGE:60:0:U RRA:AVERAGE:0.5:1:720

And I'm using a PHP script being called every 60 seconds (I know this
isn't a great way to do things, it just happens to be convenient as
I'm passing data from another system). The php script is executing the
following command:

> rrdtool update chatter.rrd N:$packets:$bytes

Where $packets and $bytes are replaced with the actual values (and as
far as I can tell, they *are* actually being replaced).

Whenever I try to generate a graph, with the following for example:

> rrdtool graph chatter.png -t "ResNet Chatter Data" DEF:Packets=chatter.rrd:packets:AVERAGE

I get the "0x0" "I'm not playing" message, and no graph. When I use
`rrdtool fetch` I get a list of "nan" values.

`rrdtool info` returns the following:

> filename = "public_html/chatter/chatter.rrd"
> rrd_version = "0003"
> step = 300
> last_update = 1150408047
> ds[packets].type = "GAUGE"
> ds[packets].minimal_heartbeat = 60
> ds[packets].min = 0.0000000000e+00
> ds[packets].max = NaN
> ds[packets].last_ds = "UNKN"
> ds[packets].value = 0.0000000000e+00
> ds[packets].unknown_sec = 146
> ds[bytes].type = "GAUGE"
> ds[bytes].minimal_heartbeat = 60
> ds[bytes].min = 0.0000000000e+00
> ds[bytes].max = NaN
> ds[bytes].last_ds = "UNKN"
> ds[bytes].value = 0.0000000000e+00
> ds[bytes].unknown_sec = 146
> rra[0].cf = "AVERAGE"
> rra[0].rows = 720
> rra[0].pdp_per_row = 1
> rra[0].xff = 5.0000000000e-01
> rra[0].cdp_prep[0].value = NaN
> rra[0].cdp_prep[0].unknown_datapoints = 0
> rra[0].cdp_prep[1].value = NaN
> rra[0].cdp_prep[1].unknown_datapoints = 0

I've been poking away at this for hours and I can't figure out what's
wrong - why the data isn't going in. If anyone could shed any light on
this it would be much appreciated!

Many thanks for taking the time to read this. Regards,

  Biggs

-- 
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http://www.biggleszx.com/
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