When to use passive vs. active checks?

[Josh Endries]

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Hello,

I'm reinstalling my Nagios server with v2.0 and it's going well so
far, but I'm curious why people use passive vs. active checks? I
thought about it while setting up check_disk and _load etc., which
are currently active, but seem like that may be better suited to be
passive checks, since they're "internal", that is they don't provide
a network service that needs to be connected to, I guess.

I know the guide says passive checks are for sporadic things, and
really it could be almost anything, but does anyone follow guidelines
or anything? I figure performance would be saved by making them
passive, maybe this is a usual way of setting these sorts of tests up?

Just curious.

Thanks,
Josh
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