Articles Archives
- “Breaking the Four 9s Barrier” as seen in The Connection, published by ITUG, by Dr. Bill Highleyman, Paul J. Holenstein and Dr. Bruce Holenstein, Breaking the Availability Barrier: ITUG Connection Journal, September 2002, November 2002, February 2003, April 2003, June 2003, September 2003 and December 2003.
- Part 6: RPO and RTO (12/03)
Explains the concepts of Recovery Time Objective (RTO), or the measure of how much time it takes to recover from a disaster, and Recovery Point Objective (RPO), or the measure of how much data is lost in the event of a disaster, and how the different recovery architectures affect each concept. - Part 5: The Ultimate Architecture (09/03)
Uses the concepts explored in the previous articles to suggest a system architecture that can dramatically increase system availability at little additional cost. - Part 4: Facts of Life (06/03)
Explores what really makes systems fail and what if anything can be done about it. (This article draws heavily on actual experience documented by Jim Gray, one of the significant contributors to NonStop computing.) - Part 3: Sync Replication (04/03)
Compares the efficiencies of synchronous replication techniques that may be used to keep database replicates in a split system in exact synchronism, thus avoiding database corruption due to update collisions. - Part 2: System Splitting (02/03)
Points out that splitting a system, a common architecture for disaster recovery, significantly improves reliability at little or no additional cost. - Part 1: The 9s Game (11/02)
Discusses the dramatic increase that can be achieved in system availability by making a system redundant, therefore capable of tolerating one or more failures, which is the basis for NonStop systems, where availabilities of four 9s are achievable. (The system is up 99.99% of the time.) - Part 0: Intro and About the Author (09/02)
How to improve the availability of systems so that the loss of any significant capacity is measured in terms of centuries, rather than years at little or no additional cost.
- Part 6: RPO and RTO (12/03)
- 24x7 Magazine, published by HP, Spring 2003 Issue
The Magazine of NonStop Computing states "JPMI selected Shadowbase software for its best-of-breed replication capabilities across heterogeneous computing environments." Read the full story at: http://h20223.www2.hp.com/NonStopComputing/downloads/24x7Magazine_Spring03.pdf
- The Connection, published by ITUG, September/October 2001 Volume 22, No. 5
High-Availability Web-Site/NSK Continuous Processing Using Database Replication in a ZLE Architecture, by Dr. Bruce Holenstein and Mr. Paul Holenstein
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