[rrd-users] long-term data in RRA

[Volker Jahns]

I would like to keep long-term sensor data in round robin archives for display over periods of
- 10 years
- 20 years
- 40 years
( including short-term data of 2 days, 2 weeks and 2 years)

Based on Alex van den Bogaerdt' proposal the following rra creation seems appropriate to me

# 40 years:
# 7 archives
#   average over    1 measurement  with 576 rows = 300 *    1 * 576/86400 = 2 d
#   average over    7 measurements with 576 rows = 300 *    4 * 576/86400 = 14 d
#   average over   30 measurements with 576 rows = 300 *   30 * 576/86400 = 60 d
#   average over  360 measurements with 576 rows = 300 *  360 * 576/86400 = 720 d  ( 2 years)
#   average over 1826 measurements with 576 rows = 300 * 1826 * 576/86400 = 3652 d ( 10 years)
#   average over 3652 measurements with 576 rows = 300 * 3652 * 576/86400 = 7304 d ( 20 years)
#   average over 7304 measurements with 576 rows = 300 * 7304 * 576/86400 = 14608 d ( 40 years)
#

rrdtool create Temperature1_40years.rrd --step 300 \
   DS:temperature:GAUGE:600:-100:100 \
   RRA:AVERAGE:0.5:1:576 \
   RRA:AVERAGE:0.5:7:576 \
   RRA:AVERAGE:0.5:30:576 \
   RRA:AVERAGE:0.5:360:576 \
   RRA:AVERAGE:0.5:1826:576 \
   RRA:AVERAGE:0.5:3652:576 \
   RRA:AVERAGE:0.5:7304:576

Is this essentially correct or is there something I am missing ( assuming that I want images of 576 pixels)?

What kind of rra are others using to hold long-term data?

Any help is much appreciated.
-- 
Volker Jahns, volker at thalreit.de