Thread:Project:Support desk/how to share uploads between two MediaWiki servers

We are considering installing MediaWiki. I would like to ask something about how to share uploads between IIS MediaWiki servers. Our environment is: We would like to have more than one IIS servers with the same url. But we do not know how to share the uploads between different IIS servers. It seems $wgUploadDirectory is about this issue, but its value is absolute path, and we cannot make it point to another folder on another server. Anyone can give some hints? Thanks a lot.
 * -MediaWiki 1.17
 * -PHP 5.38 (IIS 6.0)
 * -MySQL: 5.5.15