how to calculate the data transfer in LAN environment

Posted on 2011-05-12
Last Modified: 2012-05-11

i want to calculate the data transfer  in the  following LAN environment.

The  bandwidth from cisco switch to  server is 1 Gpbs
The bandwidth from  cisco switch to  clients port is 10\100 Mbps

How much maximum data we can transfer  in this environment

and if the clients count increases  how the data transfer will be divided

Question by:greensuman
    LVL 34

    Expert Comment

    by:Istvan Kalmar

    The maximum transfer is100 Mbps  to the clients (the real is 96 with 1500 MTU).
    The server bandwidth 1G is devided into the clients it depends on the server stability, and server stronging!

    Best regards,
    LVL 2

    Expert Comment

    Actually there are 2 questions you need to answer first:
    what is the internal throughput?
    the data transfer varies with time. do you want to calculate @ constant maximum?

    Author Comment


    i need to calculate for maximum


    Author Comment

    hi  istvan,

     if it is a  dell poweredge 910 server how the 1  Gbps will be  divided.

    LVL 2

    Accepted Solution

    Well, the answer is fairly simple. In your described environment, the landscape will behave like this:
    - the clients will connect first to your switch on 100, taking the max bandwidth they will require. consider here not only the running apps, those you can see, but also domain services, update etc. the real behaviour cannot be predicted, unless you allocate clear kilos on each of them on qos which I don't recommend
    - the internal backplane from the switch will route all the traffic according to destinations and this will probably happen at higher speed than the rest of outbound connections, so don't care too much abt this
    - the traffic towards the server (not really important the make) will first be prioritized by the switch and acknowledged by the net card on the server
    - if same priorities will come from different clients will arrive, then the channel will be dynamically allocated to all of them
    - you will find good resources here:

    Basically, if 10 clients of 100K will ask for traffic, you will require 1MB. If your requests will go over, then the network card will grant different cycles for each request, putting on hold the newer, until transmission for the previous is done.

    Best idea to do is to look in OSI levels with their explanations. THis will give you clear insight.


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