file transfer speed in a network

file transfer speed in a network
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Subject Author Date
file transfer speed in a network Bipin 10-11-2006
Posted by Bipin on October 11, 2006, 4:45 am
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hai all,
i am working in a network having morethan 200 windows XP sysetm,our
network uses CISCO switch and router. we have a remote site which
connected trhough 4MBps MAN conectivity through one off services
provides frame relay.We need to connect our remote site alltime coz,
our file servers are in remote site.

some time we feel our network soo slow , even it took morethan 2 min to
open a 1 mb .doc file .

1,How can i rectify this issue
2,How can i check file transering speed ( any software can use for
this??)
3.How it possible to check how many bandwidth is used by each off
computers

i hertlly requesting all to help me for solving this problem .


Pure Networks
Posted by Al Dykes on October 11, 2006, 8:57 am
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>hai all,
>i am working in a network having morethan 200 windows XP sysetm,our
>network uses CISCO switch and router. we have a remote site which
>connected trhough 4MBps MAN conectivity through one off services
>provides frame relay.We need to connect our remote site alltime coz,
>our file servers are in remote site.
>
>some time we feel our network soo slow , even it took morethan 2 min to
>open a 1 mb .doc file .
>
>1,How can i rectify this issue
>2,How can i check file transering speed ( any software can use for
>this??)
>3.How it possible to check how many bandwidth is used by each off
>computers
>
>i hertlly requesting all to help me for solving this problem .
>

Every version of Windows since NT3.5 has a tool called Perfmon.exe.
It can monitor and count the usage of just about every aspect of the
computer's operation. It can remotely monitor other windows boxes.

Your Cisco switch and router probably have network management
capability which can got you usage figures for the pipe.

Various versions of netmon, a network monitering tool, are included
with the different versions of Windows Server.

If your servers are *nix-based, there are lots of monitoring tools
available to you.

--
a d y k e s @ p a n i x . c o m
Harrison for Congress in NY 13CD www.harrison06.com
Don't blame me. I voted for Gore. A Proud signature since 2001

Posted by Robert Redelmeier on October 11, 2006, 10:22 am
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> 2,How can i check file transering speed ( any software can
> use for this??)

I use `ttcp` to test network speed. It avoids the disk and
occasionally software bottlenecks. It measures OS & hardware.
By running it as UDP, I can get an idea if TCP is mistuned.
But you need access from both ends. When you can't (usually
across the Internet), then hit some reliable site and see what
kind of ftp throughput you get.

> 3.How it possible to check how many bandwidth is used by
> each off computers

Usually by using a sniffer such as `tcpdump` or
monitoring areas on a managed switch.

-- Robert


Posted by Rick Jones on October 11, 2006, 1:28 pm
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>> 2,How can i check file transering speed ( any software can
>> use for this??)

> I use `ttcp` to test network speed. It avoids the disk and
> occasionally software bottlenecks. It measures OS & hardware. By
> running it as UDP, I can get an idea if TCP is mistuned. But you
> need access from both ends. When you can't (usually across the
> Internet), then hit some reliable site and see what kind of ftp
> throughput you get.

ttcp would be ok if the file transfer mechanism is FTP. If it is SMB,
(or NFS) then a request/response test would be a better match - say a
netperf TCP_RR test with suitable request/response sizes to match what
SMB is doing.

Be very cautious about UDP bulk transfer benchmarks (ttcp, netperf
UDP_STREAM). They often have no end-to-end flow control and as such
may completely saturate a bottleneck link, much to the chagrin of
other users.

When diagnosing "performance issues" I often start by looking for
retransmissions. Especially for request/response sorts of
applications, even a single lost TCP segment can ruin the whole thing.
So, check things like netstat statistics, or its platform equivalent.
If you can also check link-level statistics and statistics at the
switch(es) and/or the devices joining your LAN's to the MAN.

rick jones
--
Process shall set you free from the need for rational thought.
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...

Posted by Robert Redelmeier on October 11, 2006, 1:38 pm
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>
>> I use `ttcp` to test network speed. It avoids the disk and
>> occasionally software bottlenecks. It measures OS & hardware. By
>> running it as UDP, I can get an idea if TCP is mistuned. But you
>> need access from both ends. When you can't (usually across the
>> Internet), then hit some reliable site and see what kind of ftp
>> throughput you get.
>
> ttcp would be ok if the file transfer mechanism is FTP.
> If it is SMB, (or NFS) then a request/response test would
> be a better match - say a netperf TCP_RR test with suitable
> request/response sizes to match what SMB is doing.

Agreed. Even the venerable ping can be very useful.

> Be very cautious about UDP bulk transfer benchmarks (ttcp,
> netperf UDP_STREAM). They often have no end-to-end flow
> control and as such may completely saturate a bottleneck
> link, much to the chagrin of other users.

Isn't that the idea :) but a wise precaution to limit testing,
especially test uninterrupted duration.

> When diagnosing "performance issues" I often start by looking
> for retransmissions. Especially for request/response sorts
> of applications, even a single lost TCP segment can ruin the
> whole thing. So, check things like netstat statistics, or
> its platform equivalent. If you can also check link-level
> statistics and statistics at the switch(es) and/or the
> devices joining your LAN's to the MAN.

Always a good idea. Bad/marginal cabling can easily cause
bit errors that usually result in retransmits.

-- Robert


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