What it is
Right-sizing means matching the machine to the work. CPU, memory, disk. Not the size that looked serious in the portal. Not the size that was first in the list after you filtered by region.
On AWS this is instance type. On Azure this is VM size. Both catalogues are long on purpose. The expensive row is not a hint from the universe.
It also means shrinking later. Usage changes. The box that was right in March is a donation to the cloud bill in September.
Why it matters in the meeting
JJ sees a round number on the invoice and asks if cloud is “just like that.” Often it is one oversized VM that nobody resized after the demo.
Bart counts cores because cores are how software licenses and surprise invoices grow. “We might need it” is not a sizing method. It is a vibe.
Real world
The usual story is a proof of concept on a large size so the demo is snappy, then the proof of concept becomes production by surviving. Nobody goes back to the dropdown.
CloudWatch and Azure Monitor will tell you the box is bored. A bored box is not free. Right-sizing is reading that chart and picking a smaller shirt.
Buy the computer you are using, not the computer you might use if the Super Bowl came to the parking lot. You can always go up. Going down is a meeting. Have the meeting.
What to ask
- What is CPU and memory actually doing on the largest production boxes over the last 30 days?
- Which VMs or instances were sized for a demo and never revisited?
- Do we have a scheduled right-size review, or only a scheduled invoice?
- If we halved the cores on the top five machines, what would break besides the invoice?
You just knew a little more Jack than you did five minutes ago.
All concepts