2.8. VSAM and ESS controllers
In the previous versions of this book, we made extensive tests with VSAM clusters in order to measure how effective some VSAM features are. All of these experiences were made on a ESS model F model. In this version of this book, we change completely our I/O workload. However, we repeat two of those old measurements (with the old I/O workload), just changing the type of channels (from ESCON® to FICON) and using the new ESS model 800. The objective is to compare the gains in VSAM by just changing the I/O hardware.
2.8.1. ESS model 800 enhancements
Before we show the results, we cover the new main enhancements of ESS model 800 Shark in order to correlate them with the measured results:
More processor power
Model 800 ...
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