I just learned about Munin and I checked out some example diagramms. I don't get how the utilization by month is at about 60% and the utilization by year says its bellow around 10%. I would expect that the second diagramm should also have 60% utilization, just that the peaks are much more since the range of the x-axis is 12 times bigger.
What did I misunderstand?
EDIT: Maybe I should mention that /dev/sda is a part of a RAID 5.