OK, that's pretty slick. I didn't know cacti could do that.. :-)
------ thanks kevin.foote On Tue, 17 Nov 2009, Marc MERLIN wrote: -> On Tue, Nov 17, 2009 at 10:25:48PM +0100, Tobias Oetiker wrote: -> > Hi Marc, -> > -> > Today Marc MERLIN wrote: -> > -> > > On Tue, Nov 17, 2009 at 06:50:40AM +0100, Tobias Oetiker wrote: -> > > > Hi Marc, -> > > > -> > > > > Does that make any sense to you? -> > > > -> > > > not entirely, I can only say that irregular data arrival times are -> > > > rrdtools forte ... have you tried to write the data into a logfile -> > > > (including the timestamp) and then recreate the phaenomenon by hand ? -> > > -> > > I have all the data in a logfile already, this is where I read it from :) -> > > (script writes to logfile, cacti polls logfile from cron and feeds to -> > > rrdtool). -> > > -> > > I have another script that will dump the entire logfile, generate a log list -> > > of rrdtool update statements and I can recreate the entire rrd from scratch -> > > after erasing it and replaying all the events. -> > -> > ah ... in that case it is clear ... sometimes, you have one update -> > in the file and sometimes two by the time cacti comes around ...a -> > very bad case of jitter ... you should realy make it so that cacti -> > can trigger the data accqusition ... -> -> Mmmh, I see what you mean. Yes, now that I think about it, in a bad case -> scenario, the cacti poller could hit a race condition and get the next sample -> one period early, and see the same sample again. -> -> That must be what happened, thanks for pointing it out to me. -> -> On Tue, Nov 17, 2009 at 04:33:47PM -0500, Kevin P. Foote wrote: -> > Alternative in line w/Tobi.. scrap cacti (unless you really use it for -> > other things) and move to using your (obvious) scriptability to update -> > the RRD on your interval. Then graph with something like drraw which -> > focuses on the graph not the acquisition of the data AND the graph. -> -> So, I do use cacti for being able to generate graphs on the fly and zoom -> in/out with a few mouse clicks. It's quite nice for that. -> See: -> http://marc.merlins.org/perso/solar/2009-11.html#Brand-One-Powermeter_-Solar-and-Power-Monitoring-with-Cacti-and-Real-Time-PG_E-Time-of-Use-price-calculation -> All the graphs that you see, you can select a range with the mouse and zoom -> in or zoom out with right mouse click. -> -> All that said, cacti has an option not to update the rrd itself and let me -> do it myself. This is likely the road I'll take to fix this race condition -> problem. -> -> Thanks for the answers, -> Marc -> -- -> "A mouse is a device used to point at the xterm you want to type in" - A.S.R. -> Microsoft is to operating systems & security .... -> .... what McDonalds is to gourmet cooking -> Home page: http://marc.merlins.org/ -> _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
