server statistic Service Maximum Running Instances

[yockee]

I want to have some clarity about reading the Service Maximum Running Instances in Arcgis Server Statistic. Have 4 services running under Folder 0.

If I add all running instances (1-4) , the sum is not equal to the number of instances in the Root Folder 0. 
So, how do I read the graphic correctly and find out the number of total running instances ?

Thank you

[JoshuaBixby]

The maximum running instances setting is per machine/node of an ArcGIS Server site.  If you have a site with 2 machines and a max of 4, then it is possible to have up to 8 running across the site. Are you running a multi-machine site? 

[yockee]

I am running a single site machine. That statistics come from a single machine.

FYI, in this machine I have :
- 2 services running dedicated instances, with maximum of 4 and 3 instances.

- 5 services running shared instances

How do I read the graph correctly ?