The deadlift is called a deadlift from the weight being "dead" on the ground.
All work sets should not only be done from the floor but the bar should be 'unweighted' meaning that you are no longer holding the weight - it is resting on the floor. Reset and pull for each rep. Basically like a few have said above - a series of singles as you can't rapid fire these off.
I've seen guys barely break it from the floor and do 8 reps with bouncing and other interesting cheats. Bullshit.
If you want to rapid fire the warmups go ahead. If you want to train partials (in the rack from a raised position) then that's fine too. When DLing - all pulls are from the floor.