Hi for all,
This is my first e-mail for this list, but I sign this list a long time
ago, only now I use RRDTool in professional case !
I have questions about DS and RRA, I read all DOC's about RRDTool and
I find more informations about DS and RRA and found this mail of Dennis:
----------------------------------------------------------------------
I am new to RRDTool (I've been an MRTG user) and I need some help.
If I use the following command line (and update the RRD every minute):
rrdtool create file.rrd --step 60 DS:Load:GAUGE:120:0:255
RRA:MAX:0.5:1:720 (RRA #1)
RRA:AVERAGE:0.5:1:720 (RRA #2)
RRA:MAX:0.5:60:168 (RRA #3)
RRA:AVERAGE:0.5:60:168 (RRA #4)
RRA:MAX:0.5:1440:180 (RRA #5)
RRA:AVERAGE:0.5:1440:180 (RRA #6)
The following should be true:
RRA #1 will record a MAX value every minute and store it for 12 hours
RRA #2 will record an AVG value every minute and store it for 12 hours
RRA #3 will record a MAX value every hour and store it for 7 days
RRA #4 will record an AVG value every hour and store it for 7 days
RRA #5 will record a MAX value every day and store it for 180 days
RRA #6 will record an AVG value every day and store it for 180 days
....
-----------------------------------------------------------------------
My questions about this:
1 - Why to keep 3 RRA's (3 for MAX and 3 for AVERAGE) for the same data ?
2 - Why to keep values for 12 hours, 7 days and 180 days, only 180 days
is not suficient ?
I read rrdtutorial.html (A Real World Example) but I don't understand :^(
In this example (A Real World Example), I found 8 RRA's (4 for AVERAGE
and 4 for MAX), why is necessary ?
I'm sorry by this questions, but I really understand this !!!
Thank's for any answer :°)
No more.
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