Operating System and Hardware Prerequisites for SAP Memory Management

The following prerequisites must be met so that you can use memory management with your R/3 System (Release > 4.0A):

• The swap space may not fall below a specified level.
• You may have to install additional main memory.
• You must reset various operating system parameters and, if necessary, they must be inserted in a new operating system kernel.
• You may also have to reconfigure hardware and software.

In the following sections, you will find information about the prerequisites for swap space and main memory.

For UNIX and Windows NT, refer to the following documents for more information about changes to the kernel parameters and software prerequisites:

• UNIX Systems: R/3 Installation on UNIX -- OS Dependencies. You receive this document with the installation and upgrade packages.
• Windows NT Systems: Documentation on installing and upgrading and in
Memory Management under Windows NT

The following documents contain details about hardware prerequisites for UNIX and Windows NT:

• For installations, you can find details in the installation documentation.
• For upgrades, you can find details in this document and the upgrade documentation. For additional information, see the upgrade and installation notes for the SAP online system as well.

Swap Space Requirements

Main Memory

Data Segment Size (UNIX)

Minimizing the Windows NT File Cache

VPAGEMAX under OSF/1

Shared Memory ID under IBM AIX

Memory Pool Requirements for AS/400

Checking the Hardware and Operating System of the Host System