Does Multiple Web Adaptors = AddInstance.exe(10.0 & prior) ???

Question

Prior to 10.1 we could use AddInstance.exe to create multiple web instances. 
Is the equivalent now accomplished by installing multiple Web Adaptors?

dewright_ca · Answer

No, its not. You are not able to run multiple instances of ArcGIS Server on a single machine.

A different option could be using different web-adapters; these can be configured in IIS for using Windows/AD security and then you can break down different AD groups to control access to services.

ChrisBeaudette · Answer

RE "in 10 the main scope from multiple instance is support more than one type of authentication or user/role store":  this is exactly what we need to achieve.  Is this no longer possible as of v10.1?

nicogis · Answer

in 10.1 the architecture is changed (new 64-bit JAVA based software component architecture)
"...The Web Adaptor is Site aware, which means that it will distribute inbound service requests across the active GIS Server machines within the named Site. The Web Adaptor can also act as a reverse proxy, accepting service requests on a configurable inbound port (i.e. Port 80) and communicating with the Site GIS Server machines on Port 6080. If any of the Site GIS Server machines fail, the Web Adaptor will route service requests only to the remaining active GIS Server machines (high availability failover functionality). A single Web Adaptor can service only one named Site. Multiple Web Adaptors can be assigned to a single named Site..."
for details: http://wiki.gis.com/wiki/index.php/GIS_Product_Architecture

some samples with two web adpators:
"...
�?�You need internal users to connect to Manager through the Web Adaptor, but you want to block external users from accessing the Manager login screen. This could occur if ArcGIS Server is in a perimeter network (DMZ) and your firewalls block it from receiving connections from your internal network through port 6080. In this case you set up a second Web Adaptor for internal users only that communicates through whichever port is allowed by your firewall.
�?�You want to block external users from accessing the Manager login screen, but you are also performing web tier authentication. In this case, you set up a second Web Adaptor for internal users only that allows publishing and administrative access..."

in 10 the main scope from multiple instance is support more than one type of authentication or user/role store. ( http://help.arcgis.com/en/arcgisserver/10.0/help/arcgis_server_dotnet_help/0093/0093000000pt000000.htm)