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Weirdness in disk i/o, according to Munin...
So I've been watching our monitoring on Munin for a few weeks now. I've noticed that one of our nodes reports something quite unusual with disk latency.
Let's start with one of our better nodes.
As you can see, daily back-ups start, disk I/O ops goes up, and so:
I/O latency spikes a bit. Not that unexpected, really.
But take a look at this one:
Daily back-ups start, disk I/O ops go up, annnnnd:
I/O latency goes down. Anyone else noticed this with their nodes, or their Munin installation?