Why Kernel is required in SAP ?

[Former Member]

Hi,

Please let me know the meaning of kernel and why it is required for installing SAP and what are all the benefits ?

Kindly help me regarding this......

[Former Member · Accepted solution]

Cheenu,

SAP Kernel is the core of the application. Like all other applications the Kernel contains the executable files (.EXE files for stating various processes in SAP.

Thats th ereason why when a Kernel upgrade is done it means new versions of the various EXE files replace the older versions.

With regards to advantages, it is an appropriate question in this context since the Kernel is a must (.EXE)

Regards,

Prashant

[Former Member]

Hi,

Kernel is the heart of operating system. It contains those files which are used to run every event in SAP. ex: starting database, shutdowns of database, starting sap, shutdown of sap, saposcol, to uncar the sap files etc......iat contains more than 120 exe files.

Regards,

Nick Loy

[Former Member]

3 Year old thread

[Former Member]

The steps to do kernel upgrade are listed below.

1) Execute the command disp+work -v to get the present kernel version

2) Check with the T Code SM51 to Check the R/3 SYSTEM->STATUS to get the present kernel level

3) Download the latest kernel patch from SMP

http://service.sap.com/swdc

There are 2 files to be downloaded from SMP:

a) Database Independent Files

This is of the nomenclature SAPEXE_<Patch level>-<release date>.SAR

b) Database Dependent files

This is of the nomenclature SAPEXEDB_<Patch level>-<release date>.SAR

4) Uncar the .SAR files

Uncar the files using the SAPCAR utility and store it in a directory. SAPCAR is a program executable located in the KERNEL folder itself. If SAPCAR is not working, then copy the executable from the kernel folder to the location where the .SAR files are located.

SAPCAR -xvf <filename.SAR>

5) Stop the J2EE Engine and the SAP OS Collector

saposcol u2013k

SAPOSCOL service should be stopped because it also will get overwritten by the new file.

6) Backup the present Kernel directory

Copy the present kernel folder safely. This is important because the activity is completely reversible and switching over to the old kernel will be possible.

7) Copy the new kernel files to the RUN folder location

Copy the files in such a manner that the RUN folder is overwritten by the new files.

/usr/sap/<SID>/SYS/exe/run

cp -R <source file > <destination>

8) Check the permissions of the files in the kernel directory

chown [-R] newowner filenames

chmod <1>permissions filename

9) Start the J2EE Engine and the SAP OS Collector

saposcol u2013l

10) Check the latest Kernel level

Execute the command disp+work -v to get the new kernel level.

[Former Member]

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[Former Member]

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