[rrd-users] Re: Finding time for latest primary data point

Alex van den Bogaerdt alex at ergens.op.het.net
Thu Jan 29 09:16:46 MET 2004

On Wed, Jan 28, 2004 at 07:46:04PM -0600, Anders Nygren wrote:

> What I am planning to do is
> 1, "normal" data collection, and storing the data in rrdtool
> 2, a separate process that periodically, (after the update), gets the
> latest values from rrdtool and does threshold checks for generating 
> alarms.

Inbetween (1) and (2), time will move forward.

If 't' is T modulo R, time _could_ go from (t+n) to (t) and you will
be looking at the wrong interval.  This won't happen often however it
is possible and it is something to take care of.

> rrdtool report <file> <CF> --resolution <R> --start <T> --end <T>
> where <T> is the most recent time that is an integer multiple of <R>.

Do you mean fetch where you write report, or do I need to brush up
on my rrdtool knowledge?

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