SAP Kernel Update in UNIX based system..

Preparation:
1. Login to unix system with user root
2. Make new backup directory for the latest kernel

mkdir oldkernel

3. Backup the latest kernel

cp -pr /sapmnt/SID/exe/* /oldkernel
This will help you to switch back to old kernel , if there is any problem with the new kernel.

4. Make a new kernel directory

mkdir newkernel

5. Copy the new downloaded kernel files into /newkernel
6. Unpack the new downloaded kernel in folder /newkernel

SAPCAR -xvf SAPEXE.SAR
SAPCAR -xvf SAPEXEDB.SAR

Applying new kernel:
1. Login as <sapsid>adm

su – <sapsid>adm

2. Stop the SAP System

stopsap

3. Stop saposcol

saposcol -k

4.Switch the user to root

su – root

5. Copy all the extracted kernel files into the kernel folder

cp -pr /newkernel/* /sapmnt/SID/exe

6.change the owership to <sapsid>adm

chown <sapsid>adm /usr/sap/<SAPSID>/SYS/exe/run/*

7. Go to the current kernel directory

cd /sapmnt/SID/exe

8.Execute the following commands:

./saproot.sh <SAPSID>
This script will change the owner and the permission of related kernel file.

9. Login as <sapsid>adm

su – <sapsid>adm

10. Start the saposcol service

saposcol

11. Start the SAP system

startsap