While researching on DR best practices, I uncovered a statistic from Bank of Japan 2012 survey on business continuity. When asked how many days can a bank’s power generator runs on fuel ? The answer is surprising low. Look at this chart on page 25.
I remember in 2003 New York Blackout, I was working for a bank and their New York data centre staff was forced to drive a long distance and wait for hours to buy generator fuel. When over 40% of from JP banks do not have fuel supply over 1 day, this number is quite worrying. Japan banks and professionals are well aware of large scale of catastrophes and yet their risk assessment/impact analysis arrive in one day fuel stockpiles.
Think deeper, there are some reasons for not able to store extra fuels. First, fire safety issues. Storage of a large amount of fuel permanently will require extra safety measures. Industrial buildings or data centre location may not allow such storage of inflammable substances. Second would be cost. What else? Third is the estimation of recovery time is not directly link to fuel supply. Within 24 hours, most people would believe they can replenish fuel with confidence. However, the 2003 large scale blackout in New York lasts for 2 days. All generators were put into use and thus supply are going to be tight, you should expecting a long queue. The assumption of continuous fuel supply when disaster or large scale blackout happened simply does not hold.
One better approach is to secure priority access to fuel supply when disaster strikes, So in your next data centre audit , you should ask “Show me the contract?” Auditor are paid to ask tough questions.