create 3k of random data:

dd if=/dev/urandom bs=3k count=1 | uuencode -

Test files created per minute.

create files:

#!/bin/sh

for i in {1..60}
do
    dd if=/dev/urandom bs=3k count=1 | uuencode - > Maildir/new/file${i}.txt
    sleep 1
done

echo "files created: "
ls Maildir/new/ | wc 

bonnie is also a good test to run

http://www.linux.com/archive/feature/139742

iozone is another