[mrtg] Re: Efficiency Question

[tony bourke]

Hello Harris,

Here are a few tips I've learned:

1:  Use SCSI whenever possible.  IDE uses the general processor, therefor
causing higher CPU utilization when doing heavy I/O.  SCSI I/O overhead on
the general processor is much lower, this will help keep MRTG from running
too long.

2:  Use a different config file for each device.  Group them together as
evenly as you can over the 1-5 minutes (starting at 0, 1, 2, 3, or 4
minutes)  Keeping them on different configs allows you to re-arrange them
amongst those 5-minute slots if needed.

That should help you scale to quite a high number of devices.  I had a 500
Mhz P-III SCSI system targetting over 2,000 different targets (including
ports of switches/routers)

Hope that helps.

Tony

On Thu, 6 Dec 2001, Harris wrote:

>
>
> Question:
>
> 	I have about 40 switches, 4 routers and 5 servers that I am pulling
> information out of. I'm in the process of trying to get all of them
> configured properly. Is it better, more efficient, to have each of these
> items as a seperate cron command, or should I group items into blocks of
> config files and call cron only two or three times? Has anyone compared
> these two concepts? My concern is that as I add more items to the list,
> the system will take too long to return good values and cron will launch a
> 2nd second instance before the first one has finished.
>
> George Harris
> Network Engineer
> Northern Valley Regional High School
>
>
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Tony Bourke				tony at vegan.net



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