// Learning · 01
The vocabulary every design conversation assumes.
The ability to handle growth without falling over.
The percentage of time a system is actually usable.
During a partition, you can't fully have both at once.
How fast one thing is, versus how much fits through per second.
A promise about how fast a write becomes visible elsewhere.
Designed to survive failure, not just avoid it.
Grow one thing bigger, or add more of the same thing.
The one piece that, if it dies, takes everything with it.
A spare that's ready the moment the primary fails.
The one component actually limiting everything else's speed.