web-o-rama

MU heißt nicht gleich Muh, sondern bedeutet Multi User. Wordpress MU ist also eine zusäztliche Verwaltungssoftware, mit der sich laut Angabe der Entwickler tausende Blogs vewalten lassen. Selbiges Tool wird auch zur Verwaltung etc. auf wordpress.com eingesetzt, wo man durchaus von einer enormen Anzahl von Blogs sprechen kann. Interessant auch Teile der FAQ, die Anworten auf die Frage der Serveranforderung und Performanz des Tools geben:

What sort of hardware does it need?

This is a tricky question, it really depends on how many blogs you expect to host, an how many pageviews you expect to get. A single box running both web and MySQL will get you pretty far, probably to about 10-20 thousand blogs. Get something reasonably fast with RAID 5 hard drives. If or when that starts to strain, simply split MySQL and Apache on to one box each, and update the wp-config file as necessary. Always get the best stuff you can afford, and if people are trusting you with their blog make sure to keep backups.
Does it scale? (Also: The way you do your databases and tables doesn’t scale!)

WordPress MU creates tables for each blog, which is the system we found worked best for plugin compatibility and scaling after lots of testing and trial and error. This takes advantage of existing OS-level and MySQL query caches and also makes it infinitely easier to segment user data, which is what all services that grow beyond a single box eventually have to do. We’re practical folks, so we’ll use whatever works best, and for the 400k and counting on WordPress.com, MU has been a champ.