Uptime Calculation Question

[Breandan Dezendorf]

Does anyone have a good guide to the impact the check_interval setting
has on calculating uptime and availability data from Nagios logs?

For example, if your check_interval is set to 10 minutes, a service
could be down for 9 minutes and never register in Nagios.  However,
your availability numbers at that point couldn't be any more precise
than 99.99% (as the cutoff for "five nines" is 5.26 service outage
minutes a year).  While unlikely, six such outages would push you into
99.9% - and an SLA report that generated from Nagios log files would
still report 100%.  If the value for check_interval is set to 30
minutes, the problem is amplified - Nagios is more likely to miss
events, which makes me even less comfortable with the resulting
statistics.

Are there SLA packages for Nagios that account for this, or does
Nagios's in-built reporting engine account for this in some way?  Or,
is there a statistician amongst us who can make me understand that I'm
just being overly paranoid, and show me that the math actually works
out?

-- 
Breandan Dezendorf
breandan at dezendorf.com
bwdezend at gmail.com

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