[mrtg] Re: Has anyone used a RAMdisk to speed up MRTG?

[Jim Johnson]

> Terje Krogdahl wrote:
> > "Jim Johnson" <jim at htch.com> writes:
> >
> > > Right now I'm monitoring 25 devices.  My Pentium 166 running
> RH Linux 6.0
> > > takes 3:40 (mins:secs) for 3 different instances of MRTG
> (each polling a 3rd
> > > of my devices) to finish running.  If I run all of the
> targets from just one
> > > config (and therefore one instance of MRTG) the run time only
> goes up to 4
> > > mins.
> >
> > It seems to me like something causes MRTG to have a looong wait here.
> > Have you checked the output from MRTG to see if there's a problem? Maybe
> > some targets hold MRTG up?
> >
> > I used to do 365 targets (multiple instances) on a Pentium 200 (on IDE
> > disks, mind you!) with few problems.
>
> MRTG is very I/O intensive when it's updating the logs. 365 targets on
> IDE drives isn't too bad at all.  I guess the question we should be
> asking Mr. Johnson is 'How many Targets are you logging with what
> kinds of drives?'  The results of
> /proc/ide/ideX/hdX/<model,cache,settings>
> can be useful here.
>
I should've listed the # of targets instead of devices in my original post.
I'm currently monitoring 211 targets on my IDE WD drive (and I can't afford
anything better).

The hard drive is a WDC AC11000H
cache = 128
and settings is:
name			value		min		max		mode
----			-----		---		---		----
bios_cyl                1023            0               65535           rw
bios_head               32              0               255             rw
bios_sect               63              0               63              rw
breada_readahead        4               0               127             rw
bswap                   0               0               1               r
file_readahead          124             0               2097151         rw
io_32bit                0               0               3               rw
keepsettings            0               0               1               rw
max_kb_per_request      64              1               127             rw
multcount               0               0               8               rw
nice1                   1               0               1               rw
nowerr                  0               0               1               rw
pio_mode                write-only      0               255             w
slow                    0               0               1               rw
unmaskirq               0               0               1               rw
using_dma               0               0               1               rw

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