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Our Central Instance has 12 CPUs and 16GB of main memory. In addition, most of the work is done by my application servers. The CPU on the Central Instance is usually not more than 30% utilized, what is the best number of processes to choose for an upgrade?
The upgrade is running while your system is still being used productively. Assigning too many resources to the upgrade will have a performance impact. In addition, the performance of the backup tools needs to be considered as well. A lot of archives will be generated during the upgrade. You need to get those to tape in order to avoid an archive stuck. I normally set the import time to 24 hours and limit the number of processes to the number of CPU's divided by two. Please note that a value higher then 8 no longer reduces the upgrade runtime.