Thursday, January 12, 2012

Kernel Downgrade

We had a requirement where customer wanted to downgrade the kernel: The kernel in sandbox system EBS was on a lower level 7.20 90 and on test system EBQ it was on a higher level 7.20 114.

Due to some project go live that was scheduled the development was working in EBS System but when it was taken to the EBQ System, it didn't work well. SAP told that this is a kernel bug.

So, customer wanted to downgrade the same.

We followed the below procedure :

1) Dowloaded SAPEXE and SAPEXEDB files of version 90 from Service Marketplace.
2) Extracted those files in the already existing kernel of EBQ /sapmnt/EBQ/exe
3) We checked for lib dbsl there are two files dbhdbsllib.so dbsdbslib.so that also came included in the SAPEXE sar file.

In nutshell, extracting SAPEXE and SAPEXEDB kernel files in /sapmnt/EBQ/exe did the trick and the kernel was successfully downgraded from "Rel 7.20 patch 114" to "Rel 7.20 patch 90" exaclty same as in EBS System.

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