Draft Document for Review December 5, 2019 4:21 pm 8456pref.fm Preface Authors ' Copyright IBM Corp. 2 019. All rights reserved. xiii This IBMfi Redbooksfi describes the concepts, architecture, and implementation of the IBM  DS8900F family. The book provides reference information to assist readers who need to plan  for, install, and configure the DS8900F systems. This edition applies to DS8900F running  microcode Release 9.0 (Bundle 89.0 / Licensed Machine Code 7.9.0. xxx ). The IBM DS8900F family offers two new classes: The flexibility class delivers significant performance improvements as compared to the  previous IBM DS8880F generation The agility class is efficiently designed to consolidate all your mission-critical workloads for  IBM Zfi, IBM LinuxONE, IBM Power Systems, and distributed environments under a  single all-flash storage solution. The IBM DS8900F architecture relies on powerful IBM POWER9™ processor-based servers  that manage the cache to streamline disk input/output (I/O), maximizing performance and  throughput. These capabilities are further enhanced with the availability of the  high-performance flash enclosures (HPFE Gen2).  Like its predecessors, the DS8900F supports advanced disaster recovery (DR) solutions,  business continuity solutions, and thin provisioning. The DS8910F Rack Mounted model 993 is described in a separate publication, I IBM  DS8910F Model 993 Rack-Mounted Storage System , REDP-5566. This book was produced by a team of specialists from around the world . Bertrand Dufrasne  is an IBM Certified Consulting IT Specialist and Project Leader for IBM  System Storage™ disk products at the ITSO, San Jose Center. He has worked at IBM in  various IT areas. He has written many IBM publications, and has developed and taught  technical workshops. Before Bert joined the ITSO, he worked for IBM Global Services as an  Application Architect. He holds a Master’s degree in Electrical Engineering. Gabor Andorko  joined IBM in 2015. He is a DS8000fi Test Engineer at IBM DSS LLC in Vac,  Hungary. He supports Integration verification tests and the piloting of new hardware and  software features on DS8000 products. Gabor holds a Diploma (MSc) degree in Software  Information Technology with a specialization of Artificial Intelligence and a Diploma (MSc)  degree in Business Information Technology from the University of Debrecen. Sherri Brunson  joined IBM in March of 1985 and worked as large system IBM service  representative before becoming a Top Gun in 1990. Sherry is a Top Gun in the Eastern US for  all storage products, power systems, and IBM z Systemsfi. She has supported and  implemented DS8000 and Scaled out Network Appliance storage products globally as well as  developing and teaching educational classes. She also has taught z System classes in the  United States. GLYPH<SM590000> DS8910F: Flexibility Class all-flash GLYPH<SM590000> DS8950F: Agility Class all-flash