please help me getting this information.
Actually, this is not true in version 8.3.00 and later. the Restricted Shell/Foundation Services implementation takes up system memory that might otherwise be allocated to the Gateway application.
You will need 4 GB at a minimum to even start the API Gateway. Starting the Gateway with less than that will result in OutOfMemory errors from the JDK.
Minimum functional requirements are going to vary heavily, it depends on the type and amount of traffic you are expecting. You can survive--as in, have a functional Gateway--with as little as 1 GB of RAM and 1 CPU in a virtual infrastructure. Of course, we do not advocate for that in production as that is completely unsustainable.
Have a look at PDF document " https://c.na3.content.force.com/servlet/servlet.FileDownload?file=00P5000000SWeje " that provides some performance statistics for a single hardware appliance in a dedicated performance testing lab. You can use that as the baseline for per-appliance performance. We recommend that customers configure their virtual appliances in a similar manner as our hardware appliances: Currently, that would be 24 virtual CPUs and 32 GB of RAM per virtual appliance.
You could split that into multiple appliances, as well. 1 hardware appliance (with 24 CPU/32 GB of RAM) would be roughly equivalent to:
2 virtual appliances with 12 CPU and 16 GB each
3 virtual appliances with 8 CPU and 12 GB each.
4 virtual appliances with 6 CPU and 8 GB each.
Senior Support Engineer, CA Support
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