jm + hardware + ioutil   1

Two traps in iostat: %util and svctm
Marc Brooker:
As a measure of general IO busyness %util is fairly handy, but as an indication of how much the system is doing compared to what it can do, it's terrible. Iostat's svctm has even fewer redeeming strengths. It's just extremely misleading for most modern storage systems and workloads. Both of these fields are likely to mislead more than inform on modern SSD-based storage systems, and their use should be treated with extreme care.
ioutil  iostat  svctm  ops  ssd  disks  hardware  metrics  stats  linux 
july 2014 by jm

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