Hi, MRTG/RRDTOOL always graphs in <something>/<some time>, which is normally just what I want to do, but in some situations I want to graph just the number of times something happened during a time frame. For example if I was keeping track of members logging into a site I would query (every 5 minutes) something like
SELECT COUNT(*) as count FROM users WHERE last_login > DATE_SUB( NOW(), INTERVAL 5 MINUTE ); Say this returns something like 35 users the first time, and 40 users the second time. I issue an update into the users.rrd w/the following create definition: rrdtool create --start `date +%s` user.rrd \ DS:signin:GAUGE:600:0:U \ RRA:AVERAGE:0.5:1:288 \ RRA:AVERAGE:0.5:3:1680 \ RRA:AVERAGE:0.5:6:1440 \ RRA:AVERAGE:0.5:288:365 Graphing this, the results are in signins per second and i get something like (40 - 35)/(300 secs). I want the scale to be in "per 5 minutes" so that what I get is a graph of the number of users that signed in in that 5 minute interval, and not the average. So i used a CDEF in my graph command CDEF:s_signin=signin,300,* which should cancel with the division and leave me with (40 - 35) but instead I get values of over 1000 and the site just isn't that popular. Is there something I'm missing? Thanks Chris Pope -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/rrd-users WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi