check_mem errors

[Dirk H. Schulz]

Hello Thomas,

great, your plugins works fine. Thank you!

Regards,

Dirk

--On 29. Mai 2008 08:44:47 -0400 Thomas Guyot-Sionnest <dermoth at aei.ca> 
wrote:

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> On 29/05/08 07:14 AM, Dirk H. Schulz wrote:
>> Hello nagios fellows,
>>
>> I am running a nagios test environment on CentOS 4 and RHEL4/5, and came
>> to  recognize some errors in check_mem.pl:
>>
>> - if used with option -f (checks free memory), it does not report back
>> free  memory - the amount reported corresponds to cached memory.
>> - if used with option -u (checks used memory), it reports wrong
>> percentages, e.g. if 2.6 GB of 4 GB on a 32Bit System is used it reports
>> 93  % used.
>>
>> Are these known errors? I did not find much relating to that.
>> Is there a replacement for check_mem.pl?
>
> I never used check_mem, be be aware that Linux can cache all free memory
> while still having is available for any process than need it. On some
> servers with very stable loads the "free" memory can get down to only a
> few megs (out of many GBs) but if you take into account cached memory
> that can be freed up any time the picture is much different.
>
> I wrote this memory check (using Nagios::Plugin) that can take absolute
> values and percentages as thresholds. It parses free(1) and returns the
> amount of memory available, counting cached memory into account. It also
> let you choose the unit to display free memory with:
>
> http://www.nagiosexchange.org/cgi-bin/page.cgi?g=1433.html;d=1
>
> Since your system will always keep some memory in buffers/cache you
> should take this into account when setting thresholds.
>
> Thomas
>
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--------------------------------------------------------------
Dirk H. Schulz
IT Systems Service
Wiesenweg 12, 85567 Grafing
Tel. 0 80 92/86 25 68
Fax. 0 80 92/86 25 72
--------------------------------------------------------------
Technik vom Feinsten - und das nötige Tuning

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