The 6-2 volleyball rotation is one of two ways a team can align itself. The six refers to all six players being eligible to hit when they rotate to the front row. The two refers to there being two setters. There will always be a setter in both rows. This offense is not as common as the standard 5-1 with one setter, but can be effective.
Plan of Attack
A 6-2 rotation looks like any other from the start. A setter will do the first serve, with the second setter in a hitting position on the far left of the front row. When her turn to serve comes around, the first server will have rotated into the front row hitting position. The strategy is most beneficial to a team with two players highly skilled at both setting and hitting, or a team that hasn't developed a single stand-out setter.
Two Setters, No Waiting
Teams running a 6-2 give themselves another set of hands in the front row. In theory that should make the passing game a little more effective. It also gives the defense something extra to think about since the setter in the front row is just as likely to attack as set.
Two Too Many
A 6-2 offense isn't for everyone, and that can include the team's hitters. Often times, hitters get acclimated and more comfortable with one setter's tendencies and habits. Just like changing quarterbacks can throw off a football team's timing, changing a setter can throw hitters off their rhythm. To counter that concern, some coaches using the 6-2 will alter the lineup so certain hitters are hitting off of a certain setter.
Strategy-wise, a 6-2 lineup can give an offense more variety and force a foe to prepare for the different tendencies of the two setters. It can also be a problem for the team doing it if there's any communication problems between the setters.