Can rdisp/max_alt_mode profile parameter cause memory problem?

Question

After we increased the parameter to 8 from the default 6 because of the customer asking, we need to reset it to the default and restart the SAP.
We go a lot of error :
(u201EInsufficient Main Memoryu201D; "SPOOL_NO_CONVERSION"; Not enough ROLLR memory for STSOO block ) and a lot of update error.
These problems were comming up at the high level usage time. Now we use the default 6 max sessions but they still would like to increase it. Can anyone give an advice or have an experiance about this problem?
How should i refuse their claim? Or is there anyhitng else what should be set  too with max_alt_mode parameter.
It is sapbasis 620 sp level 54.
Thank you very much.

Answer 1

Hi,
What is the value of ztta/roll_area parameter ? Is your existing roll_area is enough to handle multiple logon sessions of the user ? 
I have opened the parameter description and found the following.
Parameter : rdisp/max_alt_modes
Short description: Maximum number of external sessions
Parameter description :
You can use this parameter to restrict the maximum number of external sessions a user is allowed to open in one logon.
You should only change this if the circumstances require it (for example, if there are too many roll areas, or the dialog load is too high).
Note that  in certain situations the system may create new, hidden sessions automatically (for example, for frontend spooling).
You can change the parameter dynamically. The changes take effect logons that occur after the parameter change.
Caution:
Up to and including Web AS 6.10, SAP GUI can display a maximum of
6 external sessions. If you want to set the parameter to a higher
value, you require a SAP GUI of release Web AS 6.20 or higher.
You should only change this parameter if the circumstances require it (for example, if there are too many roll areas, or the dialog load is too high)
Regards,
Bhavik G. Shroff