Consider the following points regarding the results of performance benchmarks with specific  conditions:  GLYPH<SM590000> For workloads that do not compress, performance between LZ4 and ZSTD are equal.  Performance is lower for FICON compression because of data expansion. GLYPH<SM590000> For workloads that do compress, FICON compression is the slowest in all cases. When  cache is not the bottleneck, LZ4 and ZSTD performed fairly equal. When cache is the  bottleneck, the method that compresses the most efficiently provides the highest  performance. However, with the older TS7700 model where the CPU overhead is a  significant factor, the software-based methods (especially ZSTD) might result in poor  performance. GLYPH<SM590000> ZSTD results in lower performance with less job concurrency because of the overhead  that the ZSTD algorithm incurs. A single stream LZ4/FICON can run up to two times faster  than a single stream ZSTD workload. GLYPH<SM590000> For batch periods where few active devices run in parallel, the use of LZ4 is ideal if  performance is most important. If compression is more important, ZSTD is a better choice.  It is also feasible to mix workloads so that some use LZ4 while others use ZSTD. GLYPH<SM590000> When many workloads are expected to run in parallel, ZSTD often is the best choice for  cumulative performance and compression. If some of the workloads require higher  performance among others, they can choose LZ4 so that they can run independently  faster, but with less compression. Note:  All of these comparisons are relative to the maximum achievable throughput in  the configuration. Small drawer configurations can also produce results where lower job  counts run faster with ZSTD because the improved compression puts less strain on the  limited disk cache. For more information about results of performance benchmark by different compression  methods, see  IBM TS7700 R4.1.2 Performance , WP102751. For TS7770 Server model (3957-VED), SSD drives now are an option at the initial  configuration for the server, and SAS HDD drives that were an option for previous models.  With SSD drives, it leads to improved code load times, response times, and Db2 in TS7700  maintenance times. 12.3.9 Internal SSD/HDD drives for TS7700 engine 12.4 TS7700 throughput: Host I/O increments  In a TS7700, the read/write throughput from the Host is limited by the total number of Host I/O  increment features that are installed. The following Host I/O increment features are available:  At least one FC 9268 (default feature) is installed. This installation can be from 1 default  increment (100 MBps uncompressed data) up to 40 increments (unlimited) by adding FC  5268. A TS7760 with an 8 Gb FICON adapter installed is limited to 25 increments.  GLYPH<SM590000> FC 5268 100 MBps increment GLYPH<SM590000> FC 9268 Plant installation of 100 MBps throughput Chapter 12. Performance considerations  715 Draft Document for Review February 7, 2020 4:43 pm 8464ch12_Performance.fm