(Rochester, MN)  —  Mayo Clinic is raising pay by six percent early next year for most workers.  The increase will be the largest across-the-board pay hike in over two decades.  Over 64-thousand allied health staff in the Rochester-based health system will receive the raises.  Jobs receiving an increase include nurses, technicians, and security and maintenance, along with others.  The increase doesn’t apply to workers covered by union contracts.