Storage alarms love a spike. A backup window overruns, a report job lands, and suddenly a dashboard is red. The instinct is to react. The better move is to ask whether the spike changed the trend at all.
The slope is the signal
Capacity planning is a question about direction and speed: how full are you, and how fast is that changing. A pool at 60 percent that has not moved in six months is calmer than a pool at 40 percent climbing two points a week. Historical depth is what lets you tell those two apart.
Forecasting beats guessing
Once you have a clean trend, a forecast is just honest arithmetic: at this rate, this pool crosses its comfort threshold on roughly this date. That turns a vague worry into a purchase-order conversation with a timeline attached.
- Keep enough history to see seasonal patterns, not just this week.
- Separate one-off events from sustained growth before you act.
- Alert on the forecast crossing a threshold, not on every daily peak.
The goal is boring, and boring is the point: no surprises, no emergency expansions, and no storage array quietly filling up while everyone watches the wrong graph.
