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kernel parameters: vm.min_free_kbytes and shmmax

edited Nov 3, 2017 9:53AM in Database - RAC/Scalability (MOSC) 2 commentsAnswered

Hello,

Is there a recommended setting or way to calculate what the kernel parameter "vm.min_free_kbytes" should be set to?

I have tried to search on Oracle support but I don't find anything concrete, showing a range of values from 51200 to 524288. Our hardware vendor support said to set it EXACTLY as follows:

vm.min_free_kbytes >=524288 && <=1048576
vm.min_free_kbytes = >=524288 && <=1048576

Yes, they actually have it setup both of these ways on two different servers of ours, but NEITHER look like a valid kernel setting to me.

Also on a system with 64GB of RAM and only running Oracle database, what is the recommended setting/calculation for shmmax?

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