By Davide Sangiorgi, David Walker
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A storage failure that renders data for 25% of a system’s users unavailable), then the event could be prorated as a 25% outage. If this failure took 1 hour to recover, then 60 minutes of outage multiplied by 25% capacity loss yields 15 minutes of prorated down time. Thus, partial capacity loss outages can be normalized into total system outages. While prorating for percentage of capacity lost is fairly straightforward, prorating a partial functionality loss event is more complex because different enterprises and users may value specific functionality differently.
The enterprise can simply plan to find a new facility after a disaster occurs, and have the replacement equipment delivered and installed at that new facility. This ad hoc strategy naturally yields the longest service disruption following a disaster. 2. ” 3. ” 4. , disaster recovery). 12 Service, Risk, and Business Continuity 5. â•‡ Some companies offer processing capabilities for both ordinary and disaster recovery needs. 6. â•‡ A hot standby network element has its software installed and its data has been kept in synch with its mate and thus should quickly be able to assume service once its active mate has failed and disaster recovery has been activated.
Given the complexity and design of enterprise systems, events that impact some but not all functionality or some but not all users are often more common than events that totally disable all functionality for all users. For example, failure of a single software process on an enterprise server is likely to impact the users or function(s) supported by that process, while users served by other processes may be unaffected and functions offered by other processes may remain available. The obvious measurement strategy for less than total outages is to prorate them based on the capacity or functionality lost.
The Pi Calculus by Davide Sangiorgi, David Walker