Application Servers with Up to 15 Users in Memory MANAGEMENT

The values listed in the following table for the host systems and server should ensure the best possible operation of your R/3 application sever for up to 15 users.

The lower limit values represent a type of minimum configuration for small R/3 installations:

Main Memory and Swap Space on the Host System

Resource	SAP Recommendation
Size of the swap file or virtual memory paging file	Minimum: the greater of the 2 following numbers: 700 MB three times the main memory Recommendation: 2-3 GB
Main memory	Minimum: 256 MB (without a database) You will achieve performance advantages with a larger main memory. Recommendation: 512 MB This value is recommended for hosts where only one R/3 server runs. If you install the database system or other servers on a host, contact the Hardware Competence Center or your system consultant.
Work processes (Windows NT)	See Determining the Number of Work Processes

R/3 Profile Parameters

How to use the individual parameters is described in Profile Parameters of the Memory Management.

Parameter	Recommended Value
abap/heaplimit	20000000 (20 mil. bytes)
abap/heap_area_dia	200000000 (200 mil. bytes)
abap/heap_area_nondia	IBM AIX: 220000000 (220 mil. bytes) Siemens-Nixdorf SINIX: 350000000 (350 mil. bytes) Other platforms: 400000000 (400 mil. bytes)
abap/heap_area_total: Limit for Heap Memory	1500000000 (1,5 GB)
em/initial_size_MB: Size of the Extended Memory Pool	128 (128 MB, 6 MB per user) Minimum 64 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	UNIX: 16384 Windows NT: the same value as rdisp/ROLL_SHM
rdisp/ROLL_SHM: Roll Buffer Size	UNIX: 2048 Windows NT: 128 blocks (1 MB, per active user)
rdisp/PG_MAXFS: Maximum Size of the R/3 Paging File	UNIX: 16384 Windows NT: the same value as rdisp/PG_SHM
rdisp/PG_SHM: Size of the Paging Buffer	UNIX: 512 Windows NT: 13 blocks (0,1 MB, per active user)
ztta/roll_area: Roll Area	UNIX: 6500000 (6,5 mil. bytes) Windows NT: 1000000 (1 mil. bytes)
ztta/roll_first: Size of the Initial Allocation from the Roll Area	UNIX: 1000000 (1 mil. bytes) If more than 6 MB of extended memory is available per user (em/initial_size_MB), you can set this value to 1 (1 byte). Windows NT: 1 (1 byte)
ztta/roll_extension: Limit for Extended Memory	40000000 (40 mil. bytes),except for background servers under IBM AIX and Siemens-Nixdorf SINIX You can find more information in the parameter documentation

The settings listed here are recommended base values that you may however, have to change if you monitor and optimize your R/3 System. For more detailed information , see Monitoring the Memory Management System.

Check the changes to the system profiles using the program sappfpar. For more information, see Checking the Hardware and Operating System of the Host System.