In active-active relationships, you cannot switch the roles of the volumes in the relationship; however, you can uses the rmvdisk -keepaux command.
With an active-active relationship, either or both of the master and auxiliary volume can be providing the data for hosts to read. If you want to remove the auxiliary volume from the relationship, you can simply delete the relationship and hosts can continue accessing the master copy of the volume. However, if you want to remove the master volume from the relationship without disrupting host access to the auxiliary volume, you need run rmvdisk -keepaux on the master volume.
Essentially the command deletes the master volume and replaces it with the auxiliary volume so that the auxiliary volume retains the host maps and ID of the deleted master volume. Only use this command when the master volume is in a stand-alone relationship.
rmvdisk -keepaux mastervolumeWhere mastervolume is the name of the master volume that you are deleting.