Criteria for adding a GIS server to a site

Before you add a GIS server to a site, you should ensure that it meets the following criteria:

• It must be running on the same operating system platform as the other GIS server machines in the site. It is recommended that you use the same operating system version and hardware resources for all GIS servers in your site. For example, if you have a site comprised of GIS servers each running on Windows Server 2008 R2 with a 3 GHz processor and 8 GB of RAM, the GIS server you add to the site should also have the same operating system and hardware specifications.
• It must be able to read and write to the site's configuration store and server directories. See About the configuration store and About server directories to learn about this requirement.
• It must be running ArcGIS Server under the same ArcGIS Server account as all the other GIS servers in the site. This can be a domain account, or it can be a local account with a name and password that are identical on all GIS servers. See The ArcGIS Server account to learn more about this account.
• It must be able to communicate with all the other GIS servers in the site through the ports listed in Ports used by ArcGIS Server. This may require adjustment of firewall settings.
• It must be able to read any data referenced by services on the site. A good way to verify this is to check whether the machine has permissions to all the data storage locations registered with the site. See About registering your data with ArcGIS Server to learn more about these registered locations.