This post is a continuation of my defense explanation. It covers defensive positions when an opponent's left side hitter is attacking.
The defense should shift into the position illustrated below as the play develops. All diggers should have their feet planted before the hit and their weight forward on their toes.
Figure 1: Defense: Right Side Hit

Figure 2: Defense: Right Side Dink

I won't go into detail about the individual positions. They are the reverse of the positions in Defensive Positions: Left Side Hitting.