Hardware Redundancy

Knowing how far physical hardware is apart from redundant clones is important when thinking about the scale of risk you are trying to mitigate.

I propose the use of a Physical Separation Index (PSI) to help model this:

PSI 0 = In same machine / enclosure

1. In same rack
2. In same room
3. On same floor / area of building
4. In same building
5. In same city
6. In same country
7. In same continent