You can get a pretty good measure of this using the iostat
tool.
% iostat -dx /dev/sda 5
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.78 11.03 1.19 2.82 72.98 111.07 45.80 0.13 32.78 1.60 0.64
The disk utilisation is listed in the last column. This is defined as
Percentage of CPU time during which I/O requests were issued to the device
(band-width utilization for the device). Device saturation
occurs when this value is close to 100%.
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