[rrd-users] Interpreting RRD output - Maximum

[Lyle Brooks]

I'm getting acquainted with RRDtool and have started to do
some data collection and graphing.  In doing so, I've come 
across some areas where I'm not understanding the results.

Perhaps someone who has more experience can explain some things
to me.

I produce two graphs from the same RRD file.  One is for the past 24
hours, the other is for the past 5 days.  What I notice when I display the
Maximum value for a data source on the graph is that I can see a higher
"maximum" value (say 27 secs) on the last 24 hour graph, than I see on
the last 5 days graph (which is 14 secs).

Inititively, I would think that "maximum" on the 5 day graph would
include this "maximum" found on the 24hour graph.

What am I not understanding?


Below is the create parameters I used.

      'DS:s:GAUGE:7200:0:U',
      'DS:l:GAUGE:7200:0:U',
      'DS:m:GAUGE:7200:0:U',
      'DS:c:GAUGE:7200:0:U',
      'DS:d:GAUGE:7200:0:U',
      'DS:a:GAUGE:7200:0:U',

      'RRA:AVERAGE:0.5:1:600',    # Every 5 minutes, keep 50 hours
      'RRA:AVERAGE:0.5:6:600',    # Every 30 minutes, keep 300 hours (12.5 days)
      'RRA:AVERAGE:0.5:24:600',   # Every 2 hours, keep 1200 hours (50 days)
      'RRA:AVERAGE:0.5:288:732',  # Every day, 732 days (approx. 2 years)

      'RRA:MIN:0.5:1:600',
      'RRA:MIN:0.5:6:600',
      'RRA:MIN:0.5:24:600',
      'RRA:MIN:0.5:288:732',

      'RRA:MAX:0.5:1:600',
      'RRA:MAX:0.5:6:600',
      'RRA:MAX:0.5:24:600',
      'RRA:MAX:0.5:288:732',

      'RRA:LAST:0.5:1:600',
      'RRA:LAST:0.5:6:600',
      'RRA:LAST:0.5:24:600',
      'RRA:LAST:0.5:288:732',


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