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→Migration
Suppose a customer just needs a bigger server. Migration is easy in the VPS environment because the VE is consistent between servers. You just copy over the files and start it up. You don't have to build a new server, install an OS, copy it all over, and then mess with it for an hour getting everything to work.
== Emergency Procedures ==
Let's say that a server fries. With VPS and good backups you have more options. You can copy the backup of the VPS onto abother server and restore it as of the last (nightly) backup. (I'm a backup freak - but it pays.) That gets the customers up instantly if they need that while a tech can go down there and fox the server with less pressure. This give you more options when bad things happen.
== Load Balancing ==
OpenVZ allows you to migrate servers live from one physical server to another. I haven't yet done that but I have done a shutdown, copy, and restart of the VE on another server and it's so easy to do that. So suppose you have a server that's a little crowded and some user starts hogging some resources. No problem. You just move a few users to another box and problem solved. This could probably be done automatically with some well configured cluster and I would love it if someone wrote a wiki page telling us how to do it.
