On 3 April 2014 17:10, Eenkhoorn, (Klaas) <klaas.eenkhoorn at vtspn.nl> wrote:
I've constructed the following data message:
[statistics.rrd] DS:abc:GAUGE:600:0:U 20 DS:def:GAUGE:600:0:U 15 DS:ghi:GAUGE:600:0:U 0
Looks OK to me.
From the client the message will be send with:
"data application.vmware.local.trends
cat /tmp/message"
I think the contents of /tmp/message needs to start on a newline.
Result: Sometimes the file statistics.rrd in ~/data/rrd/application.vmware.local gets an update sometimes not.
The man page for xymond_rrd states that it caches updates to RRD files for up to 30 minutes. I've found that refreshing a graph in the web interface seems to cause xymond_rrd to flush its cache and update the RRD files. You can run xymond_rrd with a "--no-cache" parameter to disable the cache.
And if it gets filled or created the value will be empty. This is determent by using 'rrdtool dump statistics.rrd'
RRD needs a few samples without intervals that are too large, otherwise it will throw away such untrustworthy data.
J