At 512 GPUs something fails every few hours. How does a training run survive that?

Failure stops being an event and becomes a rate. Once mean time between failures drops below the length of a run, the design question is not how to avoid interruption but how cheaply you can absorb one.

Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.