Because you defined this RRA:
RRA:AVERAGE:0.5:1:18
Which will only hold the last 18 samples. It was adequate for the
example you gave earlier on, but if you want to graph a full week, you
must think more in the lines of:
1 week = 7 days = 7*24 hours = 7*24*3600 secs = 311040000 secs.
Sample time = 900 secs
No of rows to keep = 311040000/900 = 345600 rows
That would make:
RRA:AVERAGE:0.5:1:345600
That are a lot of rows. Only useful if you are generating graphs 345600
pixels wide.
I would consolidate more than 1 primary point into a consolidated point
(=row).
Say your graph will be 600 pixels wide. Then 600 rows will be enough.
So take the average of 345600/600 = 576 primary datapoints per row:
RRA:AVERAGE:0.5:576:600
Serge.
Thanks very much for your reply. I'm still having problems with the
graph. I put the exact commands I typed in, the data file, and the
output
image here:
http://ack.berkeley.edu/~mhunter/rrdtool
Why is the data squiggle so small, especially since I explicitly
(correctly?) set the start and end times?
Thanks again for your help,
Mike
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