Feature When designing systems that our businesses will rely on, we do so with resilience in mind.
Twenty-five years ago, technologies like RAID and server mirroring were novel and, in some ways, non-trivial to implement; today this is no longer the case and it is a reflex action to procure multiple servers, LAN switches, firewalls, and the like to build resilient systems.
This does not, of course, guarantee us 100 per cent uptime. The law of Mr Murphy applies from time to time: if your primary firewall suffers a hardware failure, there is a tiny, but non-zero, chance that the secondary will also collapse before you finish replacing the primary.
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