Understanding the performance characteristics of synchronous remote copy

摘要

With the availability of three different synchronous remote copy scemes (SRDF, PPRC, andHRC), many installations are starting to consider or install remote copy subsystems to ensure business continuance. Perhaps the most common question is will it work? This paper will explore the performance relationships between I/O rate, write fraction, distance, bolcksize, numer of copy links, and the number of communication lines between the primary and remote DASD subsystems. Emphasis will be placed on the experimental design and measurement issues associated with the analysis of synchronous copy schemes over common carrier lines.