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Strange IOStat xk. Moving a mere 40GB data is too slow. Can anyone explain?

iostat -xk 5 avg-cpu: %user %nice %system %iowait %steal %idle 0.99 0.00 1.10 11.01 0.00 86.89 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s ...
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Which root paths should reside on fast media?

Which paths under / should be mounted on fast media, and which can be mounted on slower media without significantly affecting system performance? My guess: Fast Partition: swap (2G) Partition: ...