Hi Tim,
after figuring out how to set up simple clusters, I have been pointed to your email from January, where you asked for updates on $wgExternalServers documentation.
On Thu, Jan 05, 2012 at 03:33:05AM +0000, Tim Landscheidt wrote:
[ Documentation of $wgExternalServers ] Could someone update the documentation, please?
So I guess you solved your problems meanwhile. If not, maybe the new http://www.mediawiki.org/wiki/Manual:External_Storage may help out.
Kind regards, Christian