how to calculate latency for block devices?

From: George Shuklin
Date: Fri May 11 2012 - 12:02:38 EST

Good day.

How to properly calculate average latency for block devices?

(read_ticks+write_ticks)/requests or (read_ticks+write_ticks+time_in_queue)/requests? (Or just time_in_queue/requests?)

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