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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>It depends on your configuration. Count
the number of Targets, not the number of devices – for example, a 48-port
switch would be 48 metrics, or 49 if you also monitor CPU. A server may
be only 3 metrics (if you monitor CPU, memory and one network interface).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Firstly, make sure you’re using MRTG
with RRDtool as the backend (and probably Routers2 as the frontend, but my
recommendation is a bit biased in that area). This will speed things up
by a factor of 10 or more…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Next, you should get fast disks (so forget
that old EIDE stuff) as it bottlenecks on disk access.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Make sure you have enough memory –
this depends on how many threads you are running, and how many external data
collection plugins you use, and how quickly the polling completes.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Try to use RRDtool 1.3.x or later, and
MRTG in daemon mode, as this has greatly improved IO handling. If you are
using UNIX (instead of Windows) you will also get proper threading control and
disk IO memory mapping which all helps performance.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Finally, a 3GHz Xeon processor, with 1GB
memory, should be easily sufficient for up to 1000 or more targets, even if you
are using data collection plugins, provided you have decent backend
disks. I have found that the limiting factors in order of priority are:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>1. Disk speed (the big IO bottleneck)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>2. Memory (as load increases, so do the
number of threads and therefore the number of processes, and if the process is
Perl it uses more memory)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>3. CPU count (IE the number of things that
can run at once)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>4. CPU speed<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>For comparison – we have almost 5000
Targets on our 2x3GHz Xeon Linux system with 3GB memory, many of which are Perl
data collection plugins. We are bottlenecking on IO, but do not yet use
RRD1.3 (still in testing due to scheduling problems) but are still running
safely within capacity.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Steve<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p><b><font size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
mrtg-bounces@lists.oetiker.ch [mailto:mrtg-bounces@lists.oetiker.ch] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Desai, Mandar<br>
</span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>I am going to install mrtg to monitor 300 devices. I would require a
help from you all to find out what server hardware configuration would it
require if I want to monitor those 300 devices.</span></font><o:p></o:p></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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