SOLVED: Simple swap question

FreeBSD freebsd at
Fri Dec 19 18:02:53 UTC 2008

Tom Worster a écrit :
> On 12/19/08 10:37 AM, "FreeBSD" <freebsd at> wrote:
>> Because this server is monitored by Nagios and it emails me every hour a
>> warning because the swap is not 100% free (I know it's pretty extreme,
>> but I want to know if the system is swapping).
> if a swap space is available and swapping not turned off, it seems
> reasonable to expect the OS to use it as it sees fit.
> rather than trying to tinker with the kernel's swapping policy on the fly
> every time you get a warning, perhaps think about either telling nagios not
> to worry about it or don't use swapping. i'd go with the former. but you say
> you want to ensure that swap doesn't get used -- so maybe get rid of the
> swap slice?
This server is very lightly used, so most of the time if the swap is 
getting used it shows that something is going wrong. This warning 
already proved usefull once, so I don't think I'm going to change it. I 
don't want to mess with the kernel actions, but there was no reason to 
keep this in swap. I understand that the kernel can't know that, that's 
why I wanted to know the way to "reset" the swap. There is always a lot 
of free or inactive RAM and, in normal condition, the swap should not be 
used. It's been like that for months, so I think it's a good idea to be 
notified if the swap is used.


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