Virtualization guide
How to size hardware for a Proxmox HomeLab
A workload-first way to think about the decision before choosing a specific product.
Proxmox itself is rarely the only thing that determines hardware size. The useful question is what the host must run at the same time.
Start with the guests
List the VMs and containers you expect to keep active concurrently. A lab with a few lightweight infrastructure services behaves very differently from one running several general-purpose VMs, databases, media processing and nested test environments.
Memory usually becomes visible first
CPU can often tolerate short bursts of contention. Memory is less forgiving when every active guest expects its allocation at once. Leave room for the host, filesystem behaviour and future services rather than sizing exactly to today's guest allocations.
Storage has two jobs
Capacity matters, but VM storage also benefits from predictable latency and adequate endurance. Keep the question “How much data?” separate from “Where will active VM disks live?”
Plan expansion deliberately
A tiny system can be excellent for an efficient compute node, but a tower may be the better choice when you expect multiple drives, add-in networking or a GPU. The right form factor follows the workload.