how and why to benchmark

[Jan E. Schotsman]

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Message text written by Dmytro Koval'ov

"Controller DOES NOT report to speed disk whether space contiguous or 
not. Speed disk decides this and draws the picture of what it THINKS is 
representing the drive."

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This seems to be an important point in this discussion.
I find it hard to believe there is no relation between sector numbers
reported by a controller and actual position on disk. Surely it is
important for disk performance that a controller tries to realize a request
for contiguous disk space as a set of sectors that is close to each other
in some sense? Please explain, Dmytro.

Jan.