[rrd-users] Re: Specification of RRA Boundaries

Bush, Andrew G [NY] andrew.bush at lehman.com
Tue Aug 24 22:11:54 MEST 2004

Your response is appreciated and indeed I have managed to move this
problem forward somewhat by making the changes suggested. I am however
now observing a problem that the x-axis start and end times of the chart
are not lining up with the specified start and end parameters. 
As you can see (example attached) while the RRA boundaries are now
correctly aligned (thank you!) the chart is not.
As such the first entry is always lost, which I think could be impacting
the ability to show even greater summarised data.    

Any suggestions on where to look would be appreciated.

My environment;
- The specification of the RRD has been modified to have hourly RRAs
only (daily has been removed).
- Data is collected every minute.
- A Perl wrapper is building the arguments to supply to RRD
automatically (via shared pipes RRDs:: etc). The TOP of the perl wrapper
	use POSIX qw/tzset/; $ENV{'TZ'} = "EDT"; POSIX::tzset(); 
- I am charting the data for the last 7 days ending at Sunday 22 August
2004 24:00 EDT.
- Sufficient data exists in the RRA to go back past the specified start
time i.e. can chart last 14 days and get same problem.
- The graph command being used is
	RRDs::graph (-imgformat,PNG
		--height, 300, 
		--step, 86400, 
		--start, 1092628800,
		--end, 1093233600,
		--step 86400,
		AREA:data0s#0000FE:'Tell Message Rate')

	1092628800 = Monday 16 August 2004 00:00 EDT (I think!)
	1093233600 = Monday 23 August 2004 00:00 EDT (I think!)

Once again thank you.

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