KERNEL UPGRADE/PATCHES:
Kernel is the heart of SAP system and located in run directory usr/sap/SID/sys/exe/run. If consists of various executables which are required for smooth functioning of R./3 system.
Sometimes these executables gets outdated and needs to update from time to time.
The following are the reasons for Kernel Upgrade:
1) During OS upgrade, DB upgrade and OS,DB patches.
2) It is a pre-requisite to upgrade the kernel to certain level before applying support packages.
3) Some of the executables are Msgserver.exe, dispatcher.exe , sapcar.exe , TP.exe , R/3 trans.
4) Kernel upgrade is the process of replacing the existing executables with current executables.
Process of Kernel Upgrade:
1) As part of the upgrade, complete Kernel Directory can be replaced or a group of executable's or single executable can be placed.
Ex:- While importing transporting request:
1) TP gets aborted with an error, TP outdated then replace only TP.
2) While uncaring the files SAPCAR may be outdated in this replace only sapcar.
3) DB executables like SAPDBA, BRBACKUP, BRARCHIVE, BRRESTORE, BRCONNECT are grouped to be upgraded.
There are 2 types of executables:
1) R/3 executable with DB dependence.
1) Go to marketplace www.service.sap.com and Download the latest kernel based on Unicode, Non-Unicode, OS, DB
2) UNCAR files into a directory called new run.(Uncar the files using command sapcar –xvf)
3) Schedule downtime and inform users.
4)Stop SAP, DB and services if windows
5)Take the backup of existing kernel directory
6)Stop all the services including saposcol.
7)Go to exe directory rename the existing run directory to old run and rename the new run to run directory.
8)Over write the uncared files to Usr/sap/SID/sys/exe/run directory
Kernel is the heart of SAP system and located in run directory usr/sap/SID/sys/exe/run. If consists of various executables which are required for smooth functioning of R./3 system.
Sometimes these executables gets outdated and needs to update from time to time.
The following are the reasons for Kernel Upgrade:
1) During OS upgrade, DB upgrade and OS,DB patches.
2) It is a pre-requisite to upgrade the kernel to certain level before applying support packages.
3) Some of the executables are Msgserver.exe, dispatcher.exe , sapcar.exe , TP.exe , R/3 trans.
4) Kernel upgrade is the process of replacing the existing executables with current executables.
Process of Kernel Upgrade:
1) As part of the upgrade, complete Kernel Directory can be replaced or a group of executable's or single executable can be placed.
Ex:- While importing transporting request:
1) TP gets aborted with an error, TP outdated then replace only TP.
2) While uncaring the files SAPCAR may be outdated in this replace only sapcar.
3) DB executables like SAPDBA, BRBACKUP, BRARCHIVE, BRRESTORE, BRCONNECT are grouped to be upgraded.
There are 2 types of executables:
1) R/3 executable with DB dependence.
SAPEXEDB – Database Dependent
2) R/3 executable with DB Independent.
SAPEXE – Database Independent1) Go to marketplace www.service.sap.com and Download the latest kernel based on Unicode, Non-Unicode, OS, DB
2) UNCAR files into a directory called new run.(Uncar the files using command sapcar –xvf)
3) Schedule downtime and inform users.
4)Stop SAP, DB and services if windows
5)Take the backup of existing kernel directory
6)Stop all the services including saposcol.
7)Go to exe directory rename the existing run directory to old run and rename the new run to run directory.
8)Over write the uncared files to Usr/sap/SID/sys/exe/run directory
9)Execute the command (script)
Saproot.ssh
Oraroot.ssh
Start sap
What is the command to start sap after kernel upgrade?
Ø Saproot.ssh
Ø Oraroot.ssh
Ø If system is not coming up check the SAP and DB connection using command r3trans –d
Ø Check the log files like Dev_desp, Dev_W01, W02 etc
Ø Check the permission and can change permission using command CHOWN
10)If problem come check the below points………..
Check dev_disp and dev_w01….N trace files
Run cleanipc command and try to start
Change the file permission in directory
Usr/sap/SID/sys/exe/run
Sometimes we should change the OPS$ password
Restart the server to clean-up the shared memory
Check R3trans –d to check connection to DB and SAP
Start sap, run SICK any problems it will show.
What is the difference between Windows and UNIX kernel upgrade?
In UNIX we have to run Saproot.ssh and Oraroot.ssh scripts in ROOT user ID.
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