Architecture, protocols, post-mortems and the occasional uncomfortable benchmark — written by the engineers who build and commission this.
Most UNS designs fail in month three, when the second site does not fit the model. Here is the hierarchy discipline that prevents it.
Birth certificates, death certificates and the primary host. What each one actually does, and the three mistakes that cause phantom stale data.
Adding 40,000 tags one at a time takes eleven minutes. Batched, it takes nine seconds. Here is what the server is actually doing.
Deadbands, rollups, clock drift and the uncomfortable truth about fsync on industrial hardware.
Designing for 512 MB of RAM and a network link that disappears for days changes more architectural decisions than you would expect.
One upstream trip should produce one alarm, not ninety. Dependency suppression, deadbands and the rationalisation nobody wants to do.