Resource budgets
Separates supplied host capacity, reserved resources and per-guest allocation assumptions.
Day 047 / DevOps / Capacity
Proxmox Capacity Calculator
/ Overview
A dependency-free Python CLI that estimates identical guest capacity on one host using explicit CPU, RAM, storage and reserve assumptions.
A host may have enough storage for more guests while CPU or memory allocations become the earlier limit. A small planning tool should show the assumptions, reserves and limiting resource without presenting allocation arithmetic as measured performance.
/ Provided servicesClear thinking.
Clear thinking.
Practical delivery.
Bottleneck analysis
Rounds each resource limit down and reports every resource tied for the smallest guest count.
Honest planning scope
Labels the output as an allocation estimate, with performance, HA and storage-overhead limitations documented.
/ Solution
Proxmox Capacity Calculator divides explicit CPU, RAM and usable-storage budgets by the allocations of one identical guest, rounds down each resource limit and takes the smallest result. It reports ties, remaining capacity and a configurable CPU allocation ratio. It does not connect to Proxmox, inspect hardware or model HA, workload performance, storage overhead or mixed-guest placement.
/ Impact
Single-host identical-guest model
Separate CPU, RAM and disk limits
Explicit RAM and disk reserves
Configurable CPU allocation ratio
Limiting-resource ties
Remaining resource budgets
Text and JSON output
Eleven standard-library tests
Python standard library
Argparse, math and JSON provide the complete dependency-free CLI.
Defensive numeric inputs
Rejects non-finite numbers, invalid reserves, non-integer CPU counts and unsupported allocation ratios.
Unittest
Eleven tests cover each resource limit, ties, headroom, reserves, numeric boundaries and CLI JSON behavior.