dd supports writing to multiple devices at once, but not reading from
multiple inputs.

On Sat, Oct 17, 2009 at 7:12 PM, Asdo [off-list ref] wrote:

Tomasz Chmielewski wrote:

quoted

If you start using your drives for two "dd if=bigfile[12] of=/dev/null" at
the same time, you will notice the difference.

OT: Does this dd line really work? I did see it elsewhere already but
doesn't appear to work for me: seems to see only the last if=. I don't think
multiple input or output files are supported.
For this kind of tests I was doing a for loop with background dd comands (
trailing & ) IIRC
This would be a good dd feature to simplify linux-raid performance testing
though.
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       Majed B.
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