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The svctm metric from my iostat and sar output is always sub-millisecond and I do not believe it. My storage array (HP EVA4400) is telling me that my READ latency is in the 12ms range. I am doing 90% READ activity. The iostat output for 2 of my devices looks like this (sorry about the wrapping):
My original post shows a subset of the sar output for 2 devices. Each entry in the sar output file also contains metrics for an entire Volume (rather than a device). These numbers, although more realistic, do not at all correlate to the sum of the individual devices. Here is output from one time slot: