Bob Friesenhahn wrote:
It seems like this Nagios script is not very useful since the notion of
"free memory" has become antiquated.
Not true. The script is simply not intelligent enough. There are really
3 broad kinds of RAM usage:
A) Unused
B) Unfreeable by the kernel (normal process memory)
C) Freeable by the kernel (buffer cache, ARC, etc.)
Monitoring usually should focus on keeping (A+C) above some threshold.
On Solaris, this means parsing some rather obscure kstats, sadly (not
that Linux's /proc/meminfo is much better).
Or has vmstat grown more intelligence when I wasn't looking?
--
Carson
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