[rrd-users] create --start xxxx

[crtrepan at ca.ibm.com]

It souds like a simple request:

The printers guys collect number of jobs and printed pages every day and
would like me to store the info in RRDtool and graph it on demand.

I create a quick rrd for testing purposes (40 days, 60 weeks unless I
really don't understand anything...):

/rrdtool/bin/rrdtool                                        \
               create /home/crt/printers/printerpages.rrd   \
               --start 1007182800-86400                     \
               --step 86400                                 \
               DS:jobs:GAUGE:172800:U:U                     \
               RRA:AVERAGE:.05:1:40                         \
               RRA:AVERAGE:0.5:7:60                         \
               RRA:MAX:0.5:7:60                             \
               DS:pages:GAUGE:172800:U:U                    \
               RRA:AVERAGE:0.5:1:40                         \
               RRA:AVERAGE:0.5:7:60                         \
               RRA:MAX:0.5:7:60

I want to put data in the rrd once a day starting at 1007182800 so I give a
start time one day before.

I then put some data in:
1007182800      1281    5331
1007269200      892     4317
1007355600      7417    35005
1007442000      6676    33567
1007528400      6023    31523

and fetch it back:
                     jobs         pages

1007164800: 1.2810000000e+03 5.3310000000e+03
1007251200: 9.7304166667e+02 4.5282500000e+03
1007337600: 6.0576250000e+03 2.8611666667e+04
1007424000: 6.8303750000e+03 3.3866583333e+04
1007510400: 6.1590416667e+03 3.1948833333e+04

Why did rrdtool change my update time from 1007182800 to 1007164800?

How can I choose my start time exactly so daily updates won't get adjusted
like this?

Thanks


Claude R Trépanier
Support de l'infrastructure du réseau
IBM Bromont
crtrepan at ca.ibm.com

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