Typical event rate · category

Network flows log rate: 2,000 events/s per device

A network flow source typically produces 2,000 events per second per device, bursting to 10,000: unsampled; 1:1000 sampling is 1000x lower. The rate is an informed estimate, a starting point for a sizing, not a measurement; the event sizes below are measured.

2,000
events per second, typical
10,000
at the burst
822 B
median event size, 2 sources
142 GB
per device per day

Measured sources in this category

Average bytes per event, measured, and one device's volume at the typical 2,000 events per second.

SourceBytes per eventA dayA year
Cisco Netflow v5830143 GB52.3 TB
Cisco Netflow v9814141 GB51.3 TB

At the median size, a day from one device, 142 GB, is about the size of a 70B model’s weights.

Size a fleet

20,000
events per second
1.4 TB
per day
128 TB
at retention

Raw bytes, before compression, indexing overhead and replication.

Measure a sample of your own

The figure above is an average; yours will differ, and for network flow logs what moves it most is this: unsampled; 1:1000 sampling is 1000x lower. The profiler reads a sample from network flow logs in your browser, line by line, one event per line, and reports the bytes per line to set against it. Nothing is uploaded.

Logcaliper, free on iOS, has these sizes and rates built in and sizes a whole list of sources at retention: storage, cluster capacity, nodes.