Empty RRD files

[GrandPA]

Hi
I've set up a Cacti-installtion to poll data from a dhcp-server and almost evrything seams to work ok. There's this little problem that the values in th rrd-files are all 0.

The polling works alrigt and if I do a: tail -f /www/htdocs/cacti/log/cacti.log | grep CACTI2RRD

I get:
12/11/2007 12:05:17 AM - POLLER: Poller[0] CACTI2RRD: /usr/local/rrdtool/bin/rrdtool update /www/htdocs/cacti/rra/dhcp-server_poolsize_30.rrd --template PoolAvailable:PoolSize:PoolExpire:PoolActive 1197327902:8179:8179:8179:8179
12/11/2007 12:05:17 AM - POLLER: Poller[0] CACTI2RRD: /usr/local/rrdtool/bin/rrdtool update /www/htdocs/cacti/rra/dhcp-server_poolsize_31.rrd --template PoolActive:PoolSize:PoolExpire:PoolAvailable 1197327902:61:61:61:61
12/11/2007 12:05:17 AM - POLLER: Poller[0] CACTI2RRD: /usr/local/rrdtool/bin/rrdtool update /www/htdocs/cacti/rra/dhcp-server_poolsize_32.rrd --template PoolAvailable:PoolSize:PoolExpire:PoolActive 1197327902:61:61:61:61
12/11/2007 12:05:17 AM - POLLER: Poller[0] CACTI2RRD: /usr/local/rrdtool/bin/rrdtool update /www/htdocs/cacti/rra/dhcp-server_poolsize_33.rrd --template PoolActive:PoolSize:PoolExpire:PoolAvailable 1197327902:61:61:61:61
12/11/2007 12:05:17 AM - POLLER: Poller[0] CACTI2RRD: /usr/local/rrdtool/bin/rrdtool update /www/htdocs/cacti/rra/dhcp-server_poolsize_37.rrd --template PoolActive:PoolSize:PoolExpire:PoolAvailable 1197327902:61:61:61:61
12/11/2007 12:05:17 AM - POLLER: Poller[0] CACTI2RRD: /usr/local/rrdtool/bin/rrdtool update /www/htdocs/cacti/rra/dhcp-server_poolsize_40.rrd --template PoolSize:PoolExpire:PoolActive:PoolAvailable 119732790210211021
12/11/2007 12:05:17 AM - POLLER: Poller[0] CACTI2RRD: /usr/local/rrdtool/bin/rrdtool update /www/htdocs/cacti/rra/dhcp-server_poolsize_43.rrd --template PoolAvailable:PoolActive:PoolExpire:PoolSize 119732790210211021

I can se that Cacti tries to store the values into the rrd-files. If I then do a: /usr/local/rrdtool/bin/rrdtool fetch dhcp-server_poolsize_31.rrd AVERAGE

I get:

PoolSize PoolExpire PoolActive PoolAvailable

1197242100: nan nan nan nan
1197242400: nan nan nan nan
1197242700: nan nan nan nan
.
.
.
.
.
1197325200: nan nan nan nan
1197325500: 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00
1197325800: 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00
1197326100: 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00
1197326400: 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00
1197326700: 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00
1197327000: 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00
1197327300: 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00
1197327600: 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00
1197327900: 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00
1197328200: 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00 0.0000000000e+00
1197328500: nan nan nan nan

All values are zero. Can anyone please tell me why?

[gandalf]

Are you using COUNTERs or GAUGEs in that rrd file?
Reinhard