Application Server with over 50 Users (IBM i)

Use

The correct configuration for the memory management system in a large SAP NetWeaver Application Server depends on several factors. We cannot, therefore, give any recommendations for standard configuration. However, you can calculate your own approximate values by referring to the information in this section and in the other sections that are referred to.

To determine the required resources for the host system, contact the SAP Competence Center of your hardware partner. Then you can configure the SAP NetWeaver Application Server by setting the memory management parameters in the SAP system profile.

Main and Unprotected Storage on the Host System

Resource

SAP Recommendation

Free auxiliary storage

Minimum: The greater of the following two values:

6 GB
Three times the main memory

In either case, this must be greater than the sum of:
The required unprotected storage (can be estimated using the program rspfpar, see Additional Swap Space Requirements).
The memory requirements of the operating system
To be on the safe side, at least 2 GB of free ASP when executing the operation

Main storage

Guidelines:

Central system with all services, no database: 180 MB plus 5.7 MB per active user or at least 512 MB

With database: Add 150 MB plus 0.3 MB per active user

Application server: 120 MB plus 5.3 MB per active user

An increase in storage improves performance. For more information, also contact your hardware partner or the SAP Competence Center of your hardware partner.

Profile Parameters

For information about how the various parameters are used, see Profile Parameters of Memory Management.

Parameter	Recommended Value
abap/heaplimit: Work Process Restart	40000000 (40 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	See parameter documentation.
abap/heap_area_total: Heap Memory Limit	2000000000 (2 GB); see parameter documentation.
em/initial_size_MB: Extended Memory Pool Size	5 MB per active user + 1.5 MB per user; Minimum 1024 MB
em/stat_log_size_MB: Statistics - User Context Size	20
em/stat_log_timeout: Statistics - User Context Size	600
rdisp/ROLL_MAXFS: Maximum Roll File Size	32768
rdisp/ROLL_SHM: Roll Buffer Size	32768
rdisp/PG_MAXFS: Maximum Size of the SAP Paging File	32768 (The same value as rdisp/PG_SHM)
rdisp/PG_SHM: Paging Buffer Size	32768
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	20000000000 (2 GB)

Note

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

Note

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