[rrd-users] Re: Message Monitoring

On Thu, Mar 24, 2005 at 02:14:27PM -0500, James Baldwin wrote:
> rrdtool create target.rrd --start <start time> --step 3600\
> DS:inbox:ABSOLUTE:7200:U:U\ I'm not sure exactly why I chose 7200,
> except that the tutorials appeared to suggest twice the step
>
If one (hourly) update fails, the rrd will just ignore the missing
value instead of setting it to UNKNOWN.
> DS:spam:ABSOLUTE:7200:U:U\
>
> The main source of my confusion is deciding on the appropriate archive
> configuration line as none of the consolidation functions seem
> appropriate. I would like to consolidate these based on sum so that I
> can display, graphically, an accurate measure of the amount of mail and
> spam we are receiving into these accounts.
>
Use AVG for cases where the area under the curve (the "amount") should
be exact.
MAX is for cases like "the worst ping-rtts we experienced that time",
(as far as I understand :), MIN is the opposite ("the lowest 'free
diskspace'" e.g.)

btw: your min/max-values should be readjusted. min is _at least_ 0;
but _if_ you are measuring 0, your mail-system broke down
(I guess you are talking about a server which usually get's more than
a few dozen mails per hour), so maybe you should set min to some number
greater 0.
Also, you could probably give some really high number for max,
like 100000, just to make sure to get UNKNOWN if you're calculations
are completely off... :)

hth,
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