Biographical sketch of author

Mike Hartung IBM Corporation, 9000 S. Rita Road, Tucson, Arizona 85744 (phoenix1@us.ibm.com). Mr. Hartung is one of the lead architects responsible for defining the IBM midrange and enterprise storage strategy and products. An expert in highly available, high performance storage subsystems, he has an extensive patent portfolio in this area. Mr. Hartung is an IBM Fellow and a Visiting Professor at the University of Arizona. He received an M.S. degree in Electrical Engineering from Stanford University in 1970.