TFS Reliability & Disaster Recovery

bharry posed a great article on his blog talking about TFS reliability and disaster recovery breaking it down to the application and data tiers.

We continue to evolve and improve upon the TFS reliability and disaster
recovery story. Fundamentally reliability and disaster recovery are about
preserving service (or minimizing outage) and eliminating data loss in the face
of failure in components of your system. When we look at TFS component
failure, we primarily focus on the application tier (or web tier), the data tier
and the disk subsystem.