"When we as systems people design systems for disaster recover
or continuity of operations, we are usually looking at downtime.
How long will the system be down? We really should be looking at
cost and effect. Sadly, many companies cannot tell you the cost of
downtime. This is especially true for service companies. I expect
that CSX could tell me to the penny how much each minute of
downtime cost them, but does that include the costs borne by
secondary and tertiary systems impacted? Was the cost high enough
that the outage could have been engineered to prevent it?"