CAPACITY ENGINEERINGAI SRE

Capacity Headroom

Headroom is intentionally unused serving capacity reserved for bursts, failures, deployments and uncertainty.

WHY IT MATTERS

Running every GPU at the edge of saturation leaves no safe operating margin.

PRODUCTION EXAMPLE

The fleet targets 70–80% peak sustained utilization so one node can fail without immediately violating TTFT SLOs.

SRE DECISION

What N+1 or percentage headroom does each critical service require?

REMEMBERHeadroom is reliability capacity you pay for on purpose.
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