I would like to know the detail of upgrading a kernel. Im using AIX. Understand that the kernel patch is to be replace under /usr/sap/SYS/exe after uncar
1) Do we replace the whole folder of exe or the subfolder run ? (I understand
window is run, how about AIX ? )
2) We have to download the kernel for DB independent and dependent right ? If so, how do these 2 kernel updated in the system ? which particular folder ?
Best practice to go ahead is:
Step 1: Create a new folder /sapmnt/<SID>/newkernel
Step 2: Copy all contents of /sapmnt/<SID>/exe to /sapmnt/<SID>/newkernel
Step 3: Download the database independent & database dependent files.
Step 4: Uncar these files in /sapmnt/<SID>/newkernel (This will overwrite old kernel files from newkernel, thus upgrading the kernel)
Step 5: Shutdown SAP & Database (Make sure all process are stopped e.g. saposcol, Database listener, etc)
Step 6: Rename /sapmnt/<SID>/exe to /sapmnt/<SID>/oldkernel
Step 7: Rename /sapmnt/<SID>/newkernel to /sapmnt/<SID>/exe
Step 8: Execute root.sh so that kernel files have right authorisation
Step 9: Start Database & SAP system (Make sure you upgrade the kernel files on Application server as well)
Incase, you require to revert back to old kernel, just Bring down SAP & database copy back the exe folder to newkernel & oldkernel folder to exe)
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