Re: [collectd] On $Interval differences between hosts
Hi, On Wed, Jun 22, 2011 at 02:07:29PM +1000, Trent W. Buck wrote: Suppose I have centralized monitoring (i.e. hub-and-spoke), similar to centralized syslogging. On the central host (accepts UDP and writes RRD), I have Interval 60 On the nodes (collectd data and write to UDP), I have Interval 10 Is a given RRD file updated every ten seconds, or every minute? All RRD files are updated in the right interval. I.e., RRDs containing data from some node are updated using a ten seconds interval and those belonging to the central server are updated using a 60 seconds interval. Each plugin knows the interval with which it's queried and passes that information along when dispatching data to collectd. This information is also transferred over the network and, thus, available on the server as well. HTH, Sebastian -- Sebastian tokkee Harl +++ GnuPG-ID: 0x8501C7FC +++ http://tokkee.org/ Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety. -- Benjamin Franklin signature.asc Description: Digital signature ___ collectd mailing list collectd@verplant.org http://mailman.verplant.org/listinfo/collectd
Re: [collectd] On $Interval differences between hosts
Sebastian Harl wrote: Hi, On Wed, Jun 22, 2011 at 02:07:29PM +1000, Trent W. Buck wrote: Suppose I have centralized monitoring (i.e. hub-and-spoke), similar to centralized syslogging. On the central host (accepts UDP and writes RRD), I have Interval 60 On the nodes (collectd data and write to UDP), I have Interval 10 Is a given RRD file updated every ten seconds, or every minute? All RRD files are updated in the right interval. I.e., RRDs containing data from some node are updated using a ten seconds interval and those belonging to the central server are updated using a 60 seconds interval. Each plugin knows the interval with which it's queried and passes that information along when dispatching data to collectd. This information is also transferred over the network and, thus, available on the server as well. OK, that makes sense. So a follow-on question: if I define thresholds in the central hub collectd, do all thresholds apply/check every sixty seconds, or do they do the right thing? If I happened to have it the other way around (leaves update each minute, hub updates even ten seconds), I can imagine the thresholds all freaking out (when $Important is set) because they haven't seen an update for five intervals (50s)... (BTW, thanks for the fast responses :-) ___ collectd mailing list collectd@verplant.org http://mailman.verplant.org/listinfo/collectd
Re: [collectd] On $Interval differences between hosts
Hi, On Wed, Jun 22, 2011 at 06:01:10PM +1000, Trent W. Buck wrote: Sebastian Harl wrote: On Wed, Jun 22, 2011 at 02:07:29PM +1000, Trent W. Buck wrote: Suppose I have centralized monitoring (i.e. hub-and-spoke), similar to centralized syslogging. On the central host (accepts UDP and writes RRD), I have Interval 60 On the nodes (collectd data and write to UDP), I have Interval 10 Is a given RRD file updated every ten seconds, or every minute? All RRD files are updated in the right interval. I.e., RRDs containing data from some node are updated using a ten seconds interval and those belonging to the central server are updated using a 60 seconds interval. Each plugin knows the interval with which it's queried and passes that information along when dispatching data to collectd. This information is also transferred over the network and, thus, available on the server as well. OK, that makes sense. So a follow-on question: if I define thresholds in the central hub collectd, do all thresholds apply/check every sixty seconds, or do they do the right thing? Thresholds are checked whenever a value is dispatched to the daemon, i.e. that's done live and depending on the specific interval of some data-set (i.e., the right thing ;-)). If I happened to have it the other way around (leaves update each minute, hub updates even ten seconds), I can imagine the thresholds all freaking out (when $Important is set) because they haven't seen an update for five intervals (50s)... The timeout used to check for missing values depends on the interval of the data-sets as well (see the Timeout config option in collectd.conf). Cheers, Sebastian -- Sebastian tokkee Harl +++ GnuPG-ID: 0x8501C7FC +++ http://tokkee.org/ Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety. -- Benjamin Franklin signature.asc Description: Digital signature ___ collectd mailing list collectd@verplant.org http://mailman.verplant.org/listinfo/collectd
