Log Episode 1 [Thu, Sep 18, 2025] - 2026-Sep-27 Episode 2 [Thu, Sep 18, 2025] - 2026-Sep-27 Episode 3 [Thu, Sep 18, 2025] - 2026-Sep-27 Episode 4 [Thu, Sep 18, 2025] - 2026-Sep-27 Episode 5 [Thu, Sep 18, 2025] - 2026-Sep-28 Episode 6 [Thu, Sep 18, 2025] - 2026-Sep-29 Episode 7 [Thu, Sep 18, 2025] - 2026-Sep-30 Episode 8 [Thu, Sep 18, 2025] - 2026-Sep-30
Based on a LinkedIn post originally published on 27 March 2026 While working in New Zealand, my employer received several IBM enterprise-storage systems. The platforms were shared across multiple technology groups: the mid-range UNIX team; the Windows environment; and the mainframe organisation. A shared storage platform serving such different consumers needs to satisfy a wide range of performance, consistency, resilience and compatibility requirements. I wanted to understand how the systems behaved in practice, so I began running performance tests and comparing the results with other storage platforms available in the environment. The results were puzzling. Peak performance appeared to be capped at approximately the I/O throughput of a single Fibre Channel disk. For a storage system of that class, this made little sense. The hardware contained multiple drives, controllers, cache and paths. The measured result did not reflect the parallel capability suggested by the physical platform. ...