Redundancy is not without reliability cost.
Redundancy is complexity.
Redundancy has to be weighed – a simple outage and migration, or a complex auto/manual failover and state transfer management and integration?
These nuances are shrouded to newcomers, but we all eventually get kicked in the face with our cleverness.
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@SwiftOnSecurity Thinking about redundancy often pushes people into a vastly simpler architecture, though: it belies many assumptions about various pieces of the system staying in sync, and thus outright breaks some fragile setups.
