Skip to Content

If you’ve used the SAP on Linux Web Application Server 2004s SR1 (the NetWeaver 7.0 “TestDrive”  for 64-bit Linux systems with system id N4S) you know it’s a great way to enjoy a dual stack system with the minimum of resources.  With my set-up, I’ve since applied support packs to 15 (including required upgrade of MaXDB), installed EP core and run client tools from WinXP using the VMware server.

The origninal installation for the TestDrive doesn’t use sapinst but unpacks archive files of a running system called n4shost into various directories. N4S was written on SLES 10.0 but has been used successfully on other distrubutions, such as Ubuntu and openSUSE, which aren’t officially recommneded.  

I first installed N4S on openSUSE 10.3, and it’s now time to upgrade my distro to the current release. And besides, although Linux distrubution can be upgraded easily from one release to the next, with correct use of partitions for your home directory, a clean install can be a better option to ensure your distro works flawlessly. It’s also an option if you need to transfer your set-up to a new machine, as during the install drivers are automatically configured for your new hardware.

Whatever your motivation, a clean install of a new operationg system could be a problem for an already running SAP on Linux TesDrive installation. Re-applying the settings is quite straight forward, and this blog indicates those steps I found were needed.

h4. 1. Backup before you begin.

This is probably the most essential step. It’s normally recommended to mount your home directory on a separate partition, so that the install will leave untouched any personal configuration settings. I also symbolically linked+ /usr/sap, /sapdb+ and /sapmnt to a “netweaver” partition, but backing up onto an external hardrive is an alternative. I use rsysnc to an externally USB connected hard drive. –delete </p>Restore: rsync -avn /h4. 2. Re-apply the following line to /etc/fstab

tmpfs                /dev/shm             tmpfs      size=1g               0 0


Apparently, /dev/shm is for POSIX compliant shared memory applications such as NetWeaver.  Memory is allocated as needed, not all up front, so remounting with a larger value only increases the maximum that can be used. Typical value for /dev/shm will have is ½  of your physical RAM,  but nowhere near that  amount that will be actually used.


h4. 3. Create (or copy from backup) a new file +/etc/opt/sdb +containing






h4. 4(a) Add to existing /etc/services

sapmsN4S        3601/tcp        # SAP System Message Port

sapdp01         3201/tcp        # SAP System Dispatcher Port

sapdp01s        4701/tcp        # SAP System Dispatcher Security Port

sapgw01         3301/tcp        # SAP System Gateway Central Instance Port

sapgw01s        4801/tcp        # SAP System Gateway Security Port

sapdp00         3200/tcp        # SAP System Dispatcher Port

sapdp00s        4700/tcp        # SAP System Dispatcher Security Port

sapgw00         3300/tcp        # SAP System Gateway Central Instance Port

sapgw00s        4800/tcp        # SAP System Gateway Security Port

sapdbni72       7269/tcp

sql6            7210/tcp        # SAP DB

  h4. 4(b) Deactivate old ports for corresponding new SAP ports, e.g.

#visinet-gui on port 3601/tcp

#cpq-tasksmart on port 3201/tcp

#netxms-mgmt on port 4701/tcp

#iwec on port 4801/tcp

#tick-port on port 3200/tcp

#netxms-agent on port 4700/tcp

#iims on port 4800/tcp


h4. 5. Add to exisitng+ /etc/sysctl.conf+

(With my original installation I remember existing entries were overwritten! ) 


# Kernel settings (for SAP R/3)





+kernel.sem=1250 256000 100 1024 </p><p style=”margin: 0cm 0cm 0pt” class=”MsoPlainText”>#</p>  h4. 6(a). Add to /etc/groups+




  h4. 6(b). Add to /etc/passwd

n4sadm:x:1001:1001:N4S System Administrator:/home/n4sadm:/bin/csh

sdb:x:1002:1000:SAP Database Administrator:/home/sdb:/bin/bash

sqdn4s:x:1003:1001:Owner of Database Instance N4S:/home/sqdn4s:/bin/csh

+ +

Note: Ensure encryption is DES or MD5 (as per SLED/SLES, not Blowfish as is openSUSE 11.1 default)


h4. 7(a). Add to /etc/hosts shorthostname   n4shost

(ensure defined as localhost)


h4. 7(b). Add ifcfg-eth0:0 to /etc/sysconfig/network






h4. 7(c) is provided in +/home/n4sadm and +calls the command +/sbin/ifconfig eth0:0 up automatically if +added to +/etc/init.d, symbolically linked to runlevel 5 (/etc/rc.d/rc5.d) and the service enabled in YAST. It should also contain in the first lines of the file the following to indicate it will start after the network service: </p><p style=”margin: 0cm 0cm 0pt” class=”MsoPlainText”>#!/bin/sh
# Provides:       n4shost
# Required-Start: $network
# Should-Start:  
# Required-Stop:
# Default-Start:  5
# Default-Stop:
# Description:    Set NetWeaver n4shost IP address

h4. 8.(a) Copy from backup the two files in /usr/spool/sql/ini



h4.  8(b) create (or copy) symbolic links in /usr/spool/sql to

/sapdb/data/dbspeed<br />/sapdb/data/diag<br />/sapdb/data/fifo<br />/sapdb/data/ipc<br />/sapdb/data/pid<br />/sapdb/data/pipe<br />/sapdb/data/ppid

h4. 9. Download and install latest Java2 SDK from IBM

(IBMJava2-AMD64-142-SDK-1.4.2-??.0.x86_64.rpm where ?? is latest version)


IBM SDK for 64-bit AMD/Opteron

[ |]


UPDATE: Only S13 is available from the above link, which requires a patch level unavailable to the testdrive now that they have to come through solution manager. The last usable IBM Java SDK is SR12, available from:


( requires registration)


Follow note 861215 – Recommended Settings for the Linux on AMD64/EM64T JVM to set get the best settings for the J2EE engine.


Delete /usr/sap/N4S/DVEBMGS01/j2ee/cluster/

Delete /usr/sap/N4S/DVEBMGS01/SDM/program/config/


These files are recreated the next time the J2EE engine starts, reporting the current JDK release. 


Unlimited jurisdiction policy files can be obtained somewhere in the link


IBM SDK Policy files


The ZIP file should be unpacked and the two JAR files placed in the JRE’s jre/lib/security/ directory


Note: Remember to put back symbolic link from+ /usr/lib/java+ to /opt/IBMJava2-AMD64-142. Setting $JAVA_HOME not necessary, as this already supplied by /home/n4sadm/.j2eeenv_n4shost.csh

  h4. 10. Dowload 32-bit JRE from Sun

I think the J2SE 5.0 is required (JRE_1.5). For SAPGUI for Java, add to your ~/.profile

export PLATIN_JAVA=/usr/lib/jvm/jre/bin/java

Note: This directory was where YAST put my java file, so change accordingly.


Download the latest SAPGUI for Java from </p><p style=”margin: 0cm 0cm 0pt” class=”MsoPlainText”>Note: Connection in SAPGUI in file+ ~/.SAPGUI/connections+</p><p style=”margin: 0cm 0cm 0pt” class=”MsoPlainText”><description>: conn=/H/</p>h4. Finished 

<p style=”margin: 0cm 0cm 0pt” class=”MsoPlainText”>To check from within n4sadm console when the J2EE engine has reached “running” status</p><p style=”margin: 0cm 0cm 0pt” class=”MsoPlainText”> </p><p style=”margin: 0cm 0cm 0pt” class=”MsoPlainText”>cat /usr/sap/N4S/DVEBMGS01/work/dev_server0  for line “JLaunchISetState: change state from to ” (can take up to 25 minutes!)


although if it fails, the cause may be in other logs,, such as /usr/sap/N4S/DVEBMGS01/work/dev_disp




To report this post you need to login first.

Be the first to leave a comment

You must be Logged on to comment or reply to a post.

Leave a Reply