The Sun Fire X4500 Servers (nick named "Thumper") are the heart of our $HOME. All user data reside on these boxes. To ensure that there are as few bottlenecks as possible, we distribute the users onto 10 of our X4500 and run daily snapshots to other boxes. If you are interested in the details please read on. This scheme allows us in the hopefully unlikely event of a whole box going down, to easily change configuration of a single file and give back the users' $HOME which should at most be 24hrs old.