On Thu, Dec 10, 2009 at 12:32 AM, Rainer Heilke <rhei...@dragonhearth.com> wrote: [snip] >> It's things like this that make me shy away from having plain text as >> the format. A web service causing frequent reparsing of a text file >> would be likely to start adding a fair amount of load to the system >> being monitored. > > Yes, it would. Again, a fair criticism. Like I stated, I'm probably > over-paranoid due to my sar experiences. If rrdtool can store the data > cleanly and not corrupt, then maybe it should do the job.
A key problem with rrdtool is that it doesn't store the actual values that you feed it - rather it weights the values given to the intervals you specify. Suppose the most detailed portion of the rrd file is 1 minute intervals and the following values are recorded: MM:SS Value 00:15 100 01:15 50 The value stored in the rrd file at 01:00 will be something like 62.5 (15/60 * 100 + 45/60 * 50). I may be off on the exact algorithm, but just beware that data in doesn't look just like data out. It is, however, quite sufficient for visualization and maybe some other analysis. >>> I should take a look at Amber Road. Third-party software like this was >>> never >>> an option at my old job. >> >> And right now it is only on OpenStorage. Quite a shame, really. > > So, I probably won't be able to look at it at all. :-( Do take a look at Brendan Gregg's blog and get to understand the graphs there. Heat maps are a wonderful thing. I'd love to see this as a standard graph option in rrdtool (and R, and ...). -- Mike Gerdts http://mgerdts.blogspot.com/ _______________________________________________ sysadmin-discuss mailing list sysadmin-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/sysadmin-discuss
