Processors required for Nagios

[Brian Whitehead]

If you are going to be monitoring 1000 hosts you are probably looking
more like 5-10,000+ services.  If you monitor load, ssh, ftp, http,
zombie process, disk space, that would be 6 services times 1,000 hosts.
(6,000).  At that rate I would opt for the second processor or a Xeon,
which emulates two processors in one.  I would also opt for a lot more
RAM.  RAM is very inexpensive and the more you can keep in memory the
faster it's going to run and the less drive I/O you'll have.  Just my
opinion.


On Mon, 2002-08-26 at 21:38, Greg Vickers wrote:
> Hey all, I included the below to ask the correspondents:
> 
> What kind of processor are you running this system on and how do you find 
> the processor utilization on this server? I ask because I am in the middle 
> of sourcing a server for our section and are looking at a single processor 
> P3 1.4 GHz with 512Mb ram (and RAID5 3*18Gb 10k rpm + hot swap etc etc *G*).
> 
> We will be monitoring up to 1000 hosts and a bucket load (I guess 
> 1500-2000) of services. (I actually hadn't thought about how many 
> hosts/services we would be monitoring!) So for that kind of load, is a 
> second processor warranted?
> 
> Thanks all,
> Greg
> 
> p.s. just read through the tuning doc
> 
>  > am currently watching about 300 hosts with approaching 600 service
> >There are some performance tuning options that you can apply.  This
> >helped my memory out greatly.  I'm not 100% sure of the ramifications,
> >but I haven't seen any ill effects from the first one.
> >
> >Apache defaults to 8 daemons running.  I changed this to 2 at work and 1
> >at home and gained a large amount of memory back.
> >
> >You can also scale nagios to only run X number of checks at a time.
> >Depending on your configuration and how often the checks occur, you can
> >have nagios only perform 50 checks at a time for example.
> >
> >http://nagios.sourceforge.net/docs/1_0/tuning.html
> >Check #3 on the list for info on deciding how to scale your checks back.
> >
> >Hope this helps....
> >
> >Andy
> >
> >-----Original Message-----
> >From: nagios-users-admin at lists.sourceforge.net
> >[mailto:nagios-users-admin at lists.sourceforge.net] On Behalf Of Rusch,
> >Daniel
> >Sent: Monday, August 26, 2002 9:34 AM
> >To: 'Terry Simons'; Timo Koskela
> >Cc: nagios-users at lists.sourceforge.net
> >Subject: SPAM - RE: [Nagios-users] Nagios is running multiple daemons
> >
> >I posted a similar message a week or so ago and didn't get any response.
> >On
> >my system the number of processes running that are owned by nagios
> >varies
> >from a half dozen to over 100.  I assume that nagios is running
> >multithreaded and spawning of sub-processes.  I have noticed that nagios
> >will burry the box it is running on and then of course the number of
> >processes owned by nagios increases dramatically as they pile up.  Check
> >to
> >see if nagios is over loading your system.  I logged uptime and ps -few
> >|
> >grep nagios | wc -l every five minutes.
> >
> >I posted my message to see what a "normal" number of processes should
> >be,
> >but received no replies.
> >
> >Dan
> >
> >-----Original Message-----
> >From: Terry Simons [mailto:galimore at mac.com]
> >Sent: Monday, August 26, 2002 7:13 AM
> >To: Timo Koskela
> >Cc: nagios-users at lists.sourceforge.net
> >Subject: Re: [Nagios-users] Nagios is running multiple daemons
> >
> >
> >I don't know the reason, but I have seen multiple copies of Nagios
> >running.
> >
> >I haven't seen more than two, but it wasn't a parent/child
> >relationship... there were actually two copies of Nagios running...
> >
> >I thought that maybe it had something to do with the way that Nagios
> >parallelizes checks, but maybe not...
> >
> >Ethan?
> >
> >- Terry
> >
> >
> >On Sunday, August 25, 2002, at 11:59  PM, Timo Koskela wrote:
> >
> > > Hi all,
> > >
> > > Has somebody had same problem as I with Nagios. If there is something
> > > wrong in our LAN where nagios is running, or in firewall, example line
> >
> > > is cut to outer world Nagios start to run multiple daemons. Like
> >couple
> > > days ago when i checked there was about 20 copies of Nagios, and it
> > > didin't work so well then, but when i killed the main pid, they all
> > > died. Please let me know if you know the reason...
> > >
> > > Timo
> > > Finland
> > >
> >Missing every moment and preparing for the next.
> >
> >
> >
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> =================================
> Greg Vickers
> Computer Systems Officer
> Student Support and Systems
> Teaching and Learning Support Systems, QUT
> g.vickers at qut.edu.au
> Ph: 07 3864 8276 Fax: 07 3864 5425
> Mob: 0416 001 674 SD: 6147
> 
> 
> 
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-- 
Brian Whitehead - A+, LCP, RHCE
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