Anti-fragile ICT Systems Quotes

“Two examples illustrate the redundancy principle. First, when a virtual machine fails in a cloud-based system, an identical instance is started automatically. Second, a critically important system should have at least one secondary backup system that runs in parallel with the primary system to ensure a safe fallback. Leading up to the next principle, we note that the secondary system should differ from the primary system to avoid both failing for the same reasons.”
― Kjell Jorgen Hole, Anti-fragile ICT Systems

“... we should develop and operate so-called anti-fragile systems characterized by two important properties: First, an anti-fragile ICT system fails early with a small, local impact to break positive feedback loops before they can create extreme global behaviors. Second, the prevention of extreme global behaviors allows stakeholders to learn from small-impact incidents about new vulnerabilities caused by changes in the system and its environment. The vulnerabilities can then be mitigated to avoid future extreme behaviors.”
― Kjell Jorgen Hole, Anti-fragile ICT Systems

“Many man-made systems, including ICT systems, have positive feedback loops that cause certain local events to propagate and create extreme global behaviors. The extreme behaviors, especially unplanned downtime, become more common than stakeholders can accept. These outliers are modeled by probability distributions with thick tails. Unfortunately, classical methods for risk analysis based on predictions of future events tend to underestimate or ignore extreme global behaviors in complex adaptive ICT systems, even though these events may very well dominate the overall risk to stakeholders.”
― Kjell Jorgen Hole, Anti-fragile ICT Systems