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Understanding iostat with Linux software RAID

I'm trying to understand what I see in iostat, specifically the differences between the output for md and sd devices. I have a couple of quite large Centos Linux servers, each with E3-1230 CPU, 16 GB ...
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iostat am I okay?

This is the result of iostat avg-cpu: %user %nice %system %iowait %steal %idle 13.65 0.00 9.98 3.86 2.22 70.29 Device: rrqm/s wrqm/s r/s w/s rkB/s ...