Kernal update in linux machine For HDB

1.check the present kernal version in SAP Application server:

• Su - <sid>adm
• Issue the below command to check present kernal version. 

              disp+work


2. Stop SAP Application:

• login to putty session with root user id.
• su - <sid>adm
• cd /usr/sap/hostctrl/exe/
• ./sapcontrol -nr 00 -function Stop                   Note:To stop CI, here CI instance number is 00.
• ./sapcontrol -nr 01 -function Stop                   Note:To stop CS,here CS instance number is 01.
• exit
• ps -ef | grep -i sap                                               check whether any sap services are still running.
• you will found few sap services still running with user, <sid>adm.
• pkill -u <sid>adm                                        Note: To kill all the process running with <sid>adm.

3.Stop DB:   ( here my DB is HANA)

• login to putty session with root user id in to the DB host.
• su - <sid> adm
• pwd                              - To cross check whether you are in /usr/sap/<sid>/HDBXX/ . if not change pwd to /usr/sap/<sid>/HDBXX/
• HDB stop                   - To stop HANA database, it will take some time to complete execution.
•  exit
• ps -ef | grep -i hdb
• in most of the cases, you will found still few services are running with user <sid>adm
• pkill -u <sid>adm                              Note: To kill all the process running with <sid>adm.

4. cleanipc XX remove

here XX - stands for instance number.

for more info above this step: click here

Note: cleanipc command will clean Inter Process Communication.

5.Download the SAPEXE_XXX.SAR and SAPEXEDB_XXX.SAR from service market place.

6.Take backup of present kernal file:

Cd /sapmnt/<sid>/mkdir kernal_old

    hostname: cp -r /sapmnt/<SID>/exe /sapmnt/<SID>/kernal_old

The above highlighted path is backup location of old kernal files.

7. Now move the SAPEXE_XXX.SAR and SAPEXEDB_XXX.SAR from step 4, To the directory /sapmnt/<sid>/exe.

8.Extract the kernal files in the /sapmnt/<sid>/exe using SAPCAR

• Make sure that present  kernal SAPEXE._XXX.SAR and SAPEXEDB_XXX.SAR are removed. Before exacting the latest target version kernal files.
• Can check with below Linux cmd:

         Hostname: ll *.SAR

NOTE: make damn sure that result for the above command should be

1. SAPEXE_XXX.SAR
2. SAPEXEDB_XXX.SAR of the latest target version of kernal files.

• Login as <sid>adm

PWD should be /sapmnt/<sid>/exe:/usr/sap/hostctrl/exe/SAPCAR  -xvf  * -manifest SIGNATURE.SMF


9. log in with root user
   

Issue the below command

./saproot.sh <sid>


10.start DB

• log in to the DB server host with root user.
• Su - <sid>adm
• HDB start  -to start HANA Database.

11.start the SAP Application

• Log in to the SAP Application host with root.
• Su - <sid>adm
• Cd /use/sap/hostctrl/exe/
• ./sapcontrol -nr 01 -function start
• ./sapcontrol -nr 00 -function start

12.check the update kernal version now with the command.

disp+work

Note: make sure that login user is <sid>adm.