[Discuss] rsync v. cp in data migration

[Richard Pieri]

Derek Martin wrote:
> The reason I didn't do this (I didn't know how, but it did occur to me
> it was probably possible, and google would tell me) is because I
> figured it was a bit unfair...  though actually, it might make for a
> more accurate test, in some sense.

Real world case vs. synthetic benchmark. I don't actually know whether
or not it will make a difference. I do know that having cached data or
fragmented memory from a prior run that isn't flushed by the dd trick
can have an effect. Better to start with a clean slate for each run.
Better still to run each test after a clean reboot.

If you want to be really picky about it, run the test on file systems
mounted sync,dirsync. Get kernel write buffering out of the picture.

-- 
Rich P.