where is the patch for the change the polling interval

ofirhason · Joined: 19 Sep 2005 Posts: 1

TheWitness · Posted: Mon Sep 19, 2005 8:19 am Post subject:

It is not posted.

microthorne · Joined: 22 Sep 2005 Posts: 6

How can you change the polling interval? We are using Cacti to monitor resources while running performance tests. Five minutes intervals do not provide enough detail for analyzing the test environmentl. We would like to set the polling interval somewhere near every 15 seconds. Is this possible?

gandalf · Posted: Fri Sep 23, 2005 4:24 pm Post subject:

The polling interval itself is defined by the cronjob. It defaults to 5 minutes but you may change this.
But this will not help a lot, until you change the data store as well. So you must have a look at the rrd's. There it is defined as the so called "Step" value. You'll find it if you look at a data template (Step defaults to 300 seconds which in turn reflects to 5 min polling interval). Until you do not have to change an existing rrd, you may change this value. But you will run into problems, as the default rra stores 600 values at the unconsolidated rra level. If you choose 15 sec interval, 600*15=150 min is all you will store at that detail. So you must change the rra as well (see "Data Sources" -> "RRA") or (better) create new rra's for your data sources.
If you want to store e.g. 6000 values at 15 sec interval, your rrd will grow in size.
Last: as far as I know, all this is "unsupported", but MAY work. Did not try that by myself; this is just a starting point. Please look at http://www.rrdtool.orgfor more details (e.g. the tutorials will help!)
Reinhard

microthorne · Joined: 22 Sep 2005 Posts: 6

gandalf · Posted: Sat Sep 24, 2005 4:38 am Post subject: