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Use of OS Semaphores Instead of Mutexes on OS/400 for ALL SAP Releases

In the past on OS/400 Mutexes were used instead of OS Semaphores as on other platforms. As the performance issues are fixed now and there are some advantages for OS Semaphores you should switch now on all SAP and all IBM Releases with the needed patches below.

If you want to switch to OS semaphores and use the relevant products, you must first import all patches with the patch level specified in the note below for your SAP release. After that, enter the following parameter in the instance profile:
ipc/sem_fast_available = 1
(Note: If this parameter is set to 0 or missing, the MUTEX method is used.)

More information on this useful switch is available in note 1290845.



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