Hi all,
We want to know when one of our servers is swapping as a swapping server is a
normally dead server :-)
Currently we have the "normal" swap checks which generates a warning when more
than 5% swap are used and a critical when more than 10% are used.
This works ok until one time someone needs a little bit of swap. The swap gets
used but never unused (as linux does not remove something as long it is not
needed). So we get warnings and criticals while just some parts of swap are
used but not "active" (in terms of it is actively read from).
I think it would be more sufficient to not monitor how much swap is in use but
to check if pages are read from swap in some period of time. Such as
warning: if some pages were read out of swap
critical: if in all of the last three measurement-periods pages were read
I can acces the "absolute" swap out-page count by e.g.
cat /proc/vmstat | grep pswpout | cut -d " " -f2
which gives me the number of pages swapped out since the last boot. So I would
need to save this to some file and read it back.
I searched for a plugin which already does this (or a similar) kind of check
but I did not found anything.
So now I am wondering:
- did I just miss a plugin
- do I think completely wrong and my opinion is bullshit?
So the questions:
- does this kind of check make sense?
- is there any plugin which does this already?
Regards
Michael
PS: We are using Nagios on SLES11 and RHEL6
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