Why Building a Never‑Failing System Is Impossible and How to Pursue Continuous High Availability

2023 saw a wave of high‑profile outages and aggressive cost‑cutting, prompting a reflection on the true nature of high availability (HA) from an architectural perspective.

1. The Damocles Sword of HA – Two universal laws hinder perfect HA: the entropy law (systems naturally become more disordered without external effort) and Murphy’s law (any possible failure will eventually occur). Both apply to software, people, and organizations.

Examples of entropy in software include rushed projects, excessive feature churn, accumulating technical debt, and constant adoption of new technologies that increase complexity and risk.

Murphy’s law manifests as hardware failures, network cuts, bugs in MySQL/Kubernetes/Nginx, and hidden code defects that surface unpredictably.

2. The "God Doctor" Paradox – Even with dedicated SRE teams or HA investments, proving the value of those efforts is difficult; success can be attributed to luck, while failures may still occur despite safeguards.

Organizations often face a cycle where HA work is invisible, leading to budget cuts, especially during “cost‑cutting, increase‑laugh” periods, and the resulting “exercise‑style HA projects” that focus on flashy initiatives rather than sustained reliability.

3. Breaking the Cycle – Sustainable HA requires cultural commitment: continuous investment in testing, code review, design standards, monitoring, incident drills, and gradual architecture improvements (e.g., micro‑service evolution, multi‑region, hybrid cloud).

Leadership must recognize HA as an ongoing health‑maintenance activity, akin to regular medical check‑ups, and allocate consistent resources rather than one‑off projects.

In summary, the key to continuous high availability lies not in magical technical fixes but in fostering a resilient engineering culture, regular system health assessments, and realistic expectations about failure.