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Doubts regarding WAN Network sizing formula parameters

Former Member
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Hi

We have used the following SAP document - Front end requirements for SAP Business solutions

We have some doubts regarding the formula. Sometime we have the feeling it does not address very well issues as user's concurrency, WAN Optimization and contingency. However, it might be only that we are not using correctly the formula, so we would like to confirm some information regarding the parameters.

C = X * N * D * 0.25

The parameters are as follows:

C: Bandwidth in kbps that is needed for the SAP GUI

X: Amount of data per dialog step in kilo bytes

N: Number of active users (independent of the number of sessions)

😧 Average number of dialog steps per minute per user7

Numerical factor: ~0.25 = 8 (kb/kilo bytes ) * 1.25 (protocol overhead) * 1/60 (min/s) * safety factor

1.58 (response time, peak load, different technologies)

The number of active user is the average number of concurrent users (from the total number of users) which are using the network? Therefore, we should calculate first the concurrent users number?

Does any body knows what is the reasoning behind the Numerical Factor and the safety factor? It is a contingency factor? It is related with a network bandwidth contingency?

Has anyone apply WAN Optimization?

Has anyone apply any additional contingency measure additional to the safety factor?

Kind regards

Gonzalo Pérez-Prim

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Answers (1)

Answers (1)

Former Member
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Hi Gonzalo,

As you said, the number of active users is the mean number of concurrent users, since idle users don't normally need bandwidth.

I think that safety factor is an estimated number provided by SAP engineers to increase the final amount, just in case you have different issues that could lead to a lower network transmission rate. As it's a general estimation, please take into account that the particular issues of your network can have some influence in the speed calculation.

Please take into account that maybe you want to switch the option "slow network connection" in SAPGUI, just to decrease the ammount of traffic between frontends and server.

Hope this helps

Best Regards

Francisco