I would like to know what application is best for measuring bandwidth usage in large datacenters.
Our company is in the process of setting up a DC which will have around 1000 physical servers. We want to measure the outgoing and incoming traffic from the DC. We don't need to keep track of internal network activity. Something that tells us how much bandwidth each host has used per minute/hour/day/month.
I have used vnstat in the past, but it doesn't show you per-host usage.
Is it possible to use any Nagios plugin to monitor firewalls/routers using SNMP and generate reports?
I haven't worked on such large networks so am a bit lost here.