Cacti

There's no reason why you couldn't use drbd + heartbeat/pacemaker, or something similar. It might take some custom scripting for enabling/disabling the poller, but should otherwise be straight forward.

My company is using Cacti to graph all of our interface statistics. We use a lot of Nexus 5000's with Nexus 2000 fabric extenders. We have multiple Cacti instances (one in each datacenter). However, something strange has happened with one of our instances. On the Nexus 5k, all interfaces have the co...