Growing ahead of demand.
WHAT TO MEASURE
Current use, per resource The growth trend Peak against average Headroom remaining
WHY PEAK MATTERS MORE THAN AVERAGE
Systems fail at peak, not at average.
WHAT TO PROJECT
When each resource reaches its limit, at current growth.
WHAT TO PLAN
Procurement well before that point.
WHY WELL BEFORE
Hardware takes time to obtain, and import lead times here can be substantial.
WHAT CONSTRAINS GROWTH, IN ORDER
Power, frequently Cooling Storage performance Network capacity Space, last
WHAT TO WATCH FOR
A resource trending toward a limit nobody is tracking.
WHAT TO MODEL
The effect of losing a node, so redundancy is genuine at peak.
WHY
Redundancy calculated at average load fails at peak.
WHAT TO REVIEW
Whether growth assumptions still hold.
WHAT TO DECOMMISSION
Anything no longer used, which is always more than expected.
WHAT TO RECORD
Every system, its purpose, and its owner.
