[collectd] rrd_update failed with identical timestamp

[Adrian Immler]

hello,

i have collectd 3.11.2 and rrdtool 1.2.15 running on 2 mac computers.  
graphs are correctly drawn but: in /var/log/system.log i get e  
message every 10 seconds:

Apr 12 10:33:43 XXXX collectd[16757]: rrd_update failed: df-dev.rrd:  
illegal attempt to update using time 1176366823 when last update time  
is 1176366823 (minimum one second step)
Apr 12 10:33:53 XXXX collectd[16757]: rrd_update failed: df-dev.rrd:  
illegal attempt to update using time 1176366833 when last update time  
is 1176366833 (minimum one second step)
Apr 12 10:34:03 XXXX collectd[16757]: rrd_update failed: df-dev.rrd:  
illegal attempt to update using time 1176366843 when last update time  
is 1176366843 (minimum one second step)
Apr 12 10:34:13 XXXX collectd[16757]: rrd_update failed: df-dev.rrd:  
illegal attempt to update using time 1176366853 when last update time  
is 1176366853 (minimum one second step)

same thing and same .rrd file on the second mac. no other rrd files  
are affected. i already removed that file and the error persists. of  
course its only /dev and i even do not monitor it (but i could  
generate graphs - they work) but what is annoying me: the messages in  
my syslog file. it makes it nearly unreadable. so is there a  
possibiliy to suppress logging from collectd? or do you have any idea  
why this message appears (and only for this rrd?)

as i have written above: i alreade removed the rrd file, it was  
recreated and the error still exists. i have not changed the time on  
the system, but the apple ntp service is running with apple euro time  
server.

greets,

adrian