Application Server with up to 15 Users (iSeries)

The values listed in the following table for the host system and server should ensure the best possible operation of your SAP NetWeaver Application Server for up to 15 dialog users.

The lower limit values represent a type of minimum configuration for small SAP system installations.

Main and Unprotected Storage on the Host System


SAP Recommendation

Free auxiliary storage

Minimum: The greater of the following two values:

·         4 GB

·         Three times the main storage

Recommendation: 4-6 GB

Main storage

Minimum: 256 MB (storage pool without database). More main storage provides performance advantages.

Recommendation: at least 512 MB

This value is recommended for hosts on which only one instance is running. If you are planning to install the database system or a second instance on a host, please contact your Hardware Competence Center or system consultant.

Profile Parameters

For information about the use of the various parameters, see Profile Parameters for Memory Management.


Recommended Value

abap/heaplimit: Work Process Restart

20000000 (20 mil. bytes)

abap/heap_area_dia: Heap Memory Limit for Dialog Work Processes

2000000000 (2 GB)

abap/heap_area_nondia: Heap Memory Limit for Non-Dialog Work Processes

2000000000 (2 GB)

abap/heap_area_total: Heap Memory Limit

2000000000 (2 GB)

em/initial_size_MB: Extended Memory Pool Size

128 (128 MB, 6 MB per user)

Minimum 64 MB

em/stat_log_size_MB: Statistics - User Context Size


em/stat_log_timeout: Statistics - User Context Size


rdisp/ROLL_MAXFS: Maximum Roll File Size


rdisp/ROLL_SHM: Roll Buffer Size


rdisp/PG_MAXFS: Maximum Size of the SAP Paging File

16384 (The same value as rdisp/PG_SHM)

rdisp/PG_SHM: Paging Buffer Size


ztta/roll_area: Roll Area

Set automatically

ztta/roll_first: Initial Allocation Size from the Roll Area

Set automatically

ztta/roll_extension: Extended Memory Limit

40000000 (40 mil. bytes).

The settings listed here are recommended base values that you may, however, have to change if you monitor or optimize your SAP system. For more information, see Monitoring the Memory Management System.

Check the changes to the system profiles using the program rspfpar. For more information, see Operating System and Hardware Prerequisites.