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Re: [K12OSN] Up and running but need some advice

My lab has a dual 800 MHz PIII with a single IDE drive, and I can run 24 clients pretty quickly.

I do have 2GB of RAM though. If your hard drives are in a RAID configuration, that could slow them down. You might want to try using a single drive and running backups to the other every night. That way you don't have to wait for two writes every time something is written to the hard drive.

My guess, though, is that it's RAM. My lab was unusable with 1 GB of RAM.


On Thursday, January 23, 2003, at 10:24 PM, Eric Harrison wrote:

On Fri, 24 Jan 2003, Chris Gillies wrote:

Hi everyone,

Well after many months of tinkering I have finally got our lab online and
whilst I am very happy with the overall result, I do have some performance

A little inforamtion first. The server is a Tyan Motherboard with dual Xeon
2 ghz processors, 1gig of EEC ram and two 80gb 7200rpm hard drives.

Many of us have found IDE drives to be completely inadequate for
multi-user servers. SCSI drives would likely improve your performance
by a magnitude.

You are WAY overkill on the processor for 15 terminals. You're doing
ok for ram and network (GigE keeps dropping in price :-)

When things slow down to a crawl, here's a few things you can do to
get an idea of where the bottleneck is:

1) run "free", if you are seeing a large amount of Swap being used, you
   are running out of memory - adding more would help. Running "sar -B"
   will also give you an idea of the swapping activity over ten minute

2) "sar -b" will report disk i/o

3) "sar -n DEV" will report on network i/o

4) run "top" to see if there are any CPU-hogging programs.

If you don't have "sar" on your server, install the "sysstat" package.


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