I'm currently reading data from RAID and single hdd and monitoring speed with iotop. Numbers go like this:
RAID: 380MB/s 23% IO
HDD: 80MB/s 76% IO
How to interpret IO %?
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Lapsio
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IO being short for Input/Output here. These are metrics of the maximum throughput the device can have, in both directions. At a certain point it's simply performing at it's maximum speed and cannot possibly do more work than it is at the time. This would create a bottleneck, causing either errors or wait states, while the requests that are over the maximum threshold will have to be queued, cached or delayed.
The raid array is, of course, a group of disks working together which is why it has a higher throughput but smaller percentage of maximum used when compared to a single drive.
Mimp
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