why do we do kernal upgradation in central instance only

[Former Member]

Experts,

I have a question. Why do we do kernal up gradation in central instance only? what about other instances? How the up gradation takes place in other instances?

points will be awarded to all helpful answers.

Thanks in advance.

Rajesh

[Former Member]

Hi,

If you notice in the SAP MMC the first step of the Instance startup is "sapcpe.exe"

which all it does is copying files from the kernel (/usr/sap/<SID>/exe/run folder to the exe folder of every instance /usr/sap/<SID>/DXX/exe

Regards,

Pavel Sheynkman.

[Former Member]

Rajesh,

As pavel has described, when you start SAP in an App Server, the fist step is the execution of sapcpe.exe which synchronizes the local kernel exes from the CI

[Former Member]

Hi,

Whatever the other two friends have explained is correct. We do kernal upgrade only on CI when the Operating systems of the CI and the Application Instances are same.

if the CI and AI are in different operating systems then we may have to upgrade kernel in both CI and AI.

Sapcpe.exe would synchronize the kernel only when the SAP systems have homogenous OS.

Reward points if useful.

Thanks,

sree