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# Hardware Reference
## Physical Nodes
Four **Beelink S12 Pro** mini-PCs with **Intel N100** CPUs. f0/f1/f2 each run a Rocky Linux bhyve VM as k3s nodes. f3 is a standalone bhyve host — not part of the k3s cluster.
### Specs (per node)
| Component | Spec |
|-----------|------|
| CPU | Intel N100 (Alder Lake-N), 4 cores/4 threads, up to 3.4 GHz |
| RAM | 16 GB DDR4 |
| Primary SSD | 500 GB M.2 (OS) |
| Secondary SSD | 2.5" slot (used for zdata pool on f0 and f1) |
| Ethernet | GbE (Realtek, interface `re0`) |
| USB | 4× USB 3.2 Gen2 |
| Power | ~8W idle per node; ~38.8W total (3 nodes + switch) under full load |
| Dimensions | 115×102×39 mm, 280 g |
### Wake-on-LAN
All three Beelinks support WoL (`WOL_MAGIC` on `re0`). The script `~/bin/wol-f3s` on the Fedora laptop (`earth`) controls power:
```bash
wol-f3s # wake all three
wol-f3s f0 # wake only f0
wol-f3s shutdown # graceful SSH shutdown of all three
```
MAC addresses:
| Host | MAC |
|------|-----|
| f0 | e8:ff:1e:d7:1c:ac |
| f1 | e8:ff:1e:d7:1e:44 |
| f2 | e8:ff:1e:d7:1c:a0 |
| f3 | e8:ff:1e:d7:f3:d7 |
BIOS requirements for WoL: enable "Wake on LAN", disable "ERP Support", enable "Power on by PCI-E".
### IP Addresses (LAN)
| Host | LAN IP | Hostname |
|------|--------|----------|
| f0 | 192.168.1.130 | f0.lan.buetow.org |
| f1 | 192.168.1.131 | f1.lan.buetow.org |
| f2 | 192.168.1.132 | f2.lan.buetow.org |
| f3 | 192.168.1.133 | f3.lan.buetow.org |
Static IPs configured at FreeBSD install time. Also in `/etc/hosts` on all nodes.
## Network
- **Switch**: TP-Link EAP615-Wall (OpenWrt Wi-Fi hotspot with 3 Ethernet ports)
- **Uplink**: 100 Mbit/s down / 50 Mbit/s up fiber (was previously 400 Mbit/s)
- UPS also connected to the switch so Wi-Fi stays up during power outages
## Physical Location
All infrastructure lives behind the TV (spouse acceptance factor). UPS is on the left, 3 Beelinks stacked on the right.
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