Re: MRTG and RAM Disk

Mick <[email protected]> Fri, 30 Jan 2015 06:31:46 +0000

Newsgroups	gmane.network.mrtg.user
Message-ID	<[email protected]>

On Friday 30 Jan 2015 05:13:09 Troy Lea wrote:
> I've been playing around with the idea of having MRTG use a RAM Disk.
> 
> Specifically on Nagios XI and CentOS.
> 
> I've been successfully able to define the current settings and it does work
> well.
> 
> LogDir: /var/nagiosramdisk/mrtg
> ThreshDir: /var/nagiosramdisk/mrtg
> WorkDir: /var/nagiosramdisk/mrtg
> 
> Using the RAM Disk improves performance, especially once you get into 4000+
> ports being queried.
> 
> The only problem I have is when I reboot the server the port files don't
> exist until the MRTG has run the first time. For example these files:
> 
> ub04_93.rrd
> ub04_94.rrd
> ub04_95.rrd
> ub04_96.rrd
> ub04_97.rrd
> ub04_98.rrd
> 
> This causes a problem with the check_rrdtraf program that looks for these
> files. The problem is overcome once MRTG runs the first time.
> 
> I'm wondering if MRTG has an option which will generate all these files
> without actually doing an SNMP query to all the devices.
> 
> Does anyone have any thoughts or suggestions on this topic?
> 
> Cheers
> 
> Troy

Couldn't you change the shutdown script for Nagios/mrtg to save the files to 
disk from ramdisk and then reload them before Nagios is started?

-- 
Regards,
Mick

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