Sizing and Scaling

Netdata monitors your network from Agents you place across it — every device polled in parallel, at a cadence you set per device — and scales to thousands of devices and hundreds of sites by adding Agents, not by growing a central server. However you split the network, the dashboards stay unified.

One Agent per site is your hub

Run the SNMP collector on the Agent on the device LAN. That Agent is the hub for its part of the network: it polls the local devices, maps their topology, and receives their traps — together, near the devices. Each device appears as its own node with full charts, alerts, and retention. This is the unit you deploy and size.

Scale up and out — the dashboards don't change

You can grow a hub two ways, and mix them freely:

• Up — a larger Agent that covers more devices.
• Out — more Agents, each owning a slice of the network (a site, a building, a subnet, a region — split it however suits you).

One rule makes the difference: keep a slice's SNMP, traps, and topology on the same Agent. That co-location is what lets traps arrive already enriched with device and topology context, automatically, with no correlation rules to maintain. (NetFlow has no such tie — you can run it on the same Agent or a separate one, as you prefer.)

No matter how you split the network — up, out, or both — Netdata Cloud presents one unified view: dashboards and a single topology across every hub. The deployment shape is your operational choice; it never changes what operators see.

For centralized retention and high availability, hubs stream to Parents (a Parent handles on the order of 500 Agents); cluster Parents for HA.

What sets a hub's capacity

SNMP polling is CPU work — and the CPU that matters most is usually the device's, not the Agent's. The Agent polls every device in parallel; a device, by contrast, answers SNMP from a modest control-plane processor it shares with real work, and walking a large table (a full MAC, interface, or BGP table) costs it real CPU.

So you pace polling to the devices:

• Match the interval to the device. The default is a safe 10 seconds. Tighten it for the few interfaces where finer resolution is worth it and the device can take it (busy uplinks, core links); relax it to 30 or 60 seconds for slower or busier-CPU gear. You set the interval per device, so light and heavy devices coexist on one hub.
• Ease the heavy walks with a smaller max_repetitions on any device that struggles with large responses.

When a slice of the network outgrows comfortable pacing on one Agent, you don't push harder — you add an Agent and hand it part of the network.

Keep a hub healthy

Two signals, both visible in Netdata, tell you a hub is comfortable:

• Each poll cycle finishes inside its interval (the collector reports poll timings per device).
• Per-device SNMP timeout/retry rates stay near zero.

If a heavy device pushes either, give it a longer interval or a smaller max_repetitions — see Troubleshooting.

Checklist

1. Put the hub on the device LAN and let it poll locally.
2. Set the interval per device — tight where you need resolution, longer for slow or busy gear.
3. Keep SNMP + traps + topology together on each Agent so enrichment stays automatic.
4. Add Agents to grow — split the network however suits you; the dashboards stay unified.
5. Stream to Parents for centralized retention and HA.

What's next

• Configuration — intervals, max_repetitions, SNMPv3, discovery.
• Validation — confirm clean polling.
• Troubleshooting — pacing a device that struggles to answer.