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Contact Information:
Thomas Beretvas
E-mail: Contact
Beretvas Performance Consultants
435 Brayden Way, Draper, UT. 84020
Phone: 801-816-0975
Fax: 775-402-2848 |
Biography:
Tom Beretvas, Principal of Beretvas Performance Consultants, has over 40 years of experience in data processing. He joined IBM in 1964 and has focused on MVS performance since 1971, which is when he became the first MVS performance manager. Later he was sent to Europe for 4 years on assignment with the mission of fixing the then serious MVS performance issues. He visited many installations as a roving consultant identifying and fixing performance problems. Upon return to the States for about 8 years he focused on paging performance issues and became one of the authors of both MVS and VM block paging algorithms. Paging was so closely associated with disk I/O at the time, thus he turned his attention to I/O performance problems, which became the hottest issue. He formed and became chairman of the Data Storage Architecture Board, which designed the blueprint for what later became DFSMS. He spent many ears in this job.
Tom retired from IBM in 1992 as a "Senior Technical Staff Member" (a somewhat exalted title) after a distinguished career in which he specialized in MVS system, storage, and paging performance. During his IBM career Tom was the author of many publications and "orange books" mostly related to performance.
Tom established Beretvas Performance Consultants in 1992 as an independent firm devoted to MVS (now z/OS) performance consulting and education, primarily in the storage (DASD) performance arena. Besides consulting assignments with Fortune 500 companies he has been very active in teaching. Thus, he has conducted week-long DASD performance, capacity planning and architecture classes independently and for IBM, HDS, STK and other vendors.
Since 1992, Tom has been active as a consultant, educator and mentor, specializing in storage performance issues. He is a regular speaker at SHARE, IBM Storage and z/OS performance conferences, and Computer Measurement Group (CMG) conferences. He has published more than 40 papers and monographs. In 2000 Tom and Peter Enrico joined forces in creating a new seminar titled Essential z/OS Performance Tuning. This widely acclaimed seminar has been delivered to enthusiastic student reception about 20 times since then. Tom and Peter also cooperated in several very successful consulting assignments covering MVS (z/OS) performance issues
For more information about Tom Beretvas and his services, please contact our office.
