ArcGIS Server 10.5 Windows

This question has been beat to death, but like others have said, documentation is hard to follow and described differently in places. I understand all of the concepts and what is done, so I am hoping this is a simple question.

For a service, in some cases max instances can be set to n + 1 (n number of cores).

Does this mean for a 3 machine site with 4 cores on each machine the number is 12 + 1, or 4 + 1?

E.g. 4 cores each of three machines

4 x 3 + 1 = 13 max instances or 4 + 1 = 5 max instances.

  • If you configure 13 instances on a 4-core host, you'll not enjoy the result. – Vince May 31 at 17:56
  • That is what I think as well, but I want to confirm that is regardless of the number machines involved in the entire site. – Bill Harvey May 31 at 18:08
  • The number in the instances (min and max) is the number in each Server site. The load on a enterprise geodatabase with 5 max instances with 3 sites could be 15 connections. The load on an enterprise geodatabase with 13 max instances across 3 sites would be 39 connections. It's probably not wise to exceed the number of cores if you have a large number of services which will busy at one time, since a single client could chew on all of them (plus some) to pull multiple tiles in parallel. – Vince May 31 at 19:26

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