The three ‘R’s of dependability

The three R’s of dependability by Paul Fretter

We need to feel that we can depend on computer services or systems, to a greater or lesser degree, according to their importance, exposure and development status.  Almost by definition, critical systems need to be highly dependable, whereas faults or outages can be tolerated in non-essential and development systems.  In this short article, I attempt to put into words what I think are the core components of the intuition or ‘gut-feeling’ that the seasoned sysadmin or service manager will possess. .  I propose the Dependability of a system can be described as a function of three properties: Reliability, Resilience and Robustness, specifically according to three simple questions. …

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