Front cover Draft Document for Review September 16, 2021 1:56 pm SG24-8501-00 IBM DS8900F Performance Best Practices and Monitoring Peter Kimmel Sherri Brunson Lisa Martinez Luiz Moreira Ewerson Palacio Rick Pekosh Ali Rizvi Paul Smith Redbooks Draft Document for Review August 31, 2021 6:15 pm 8501edno.fm IBM Redbooks IBM DS8900F Performance Best Practices and Monitoring September 2021 SG24-8501-00 8501edno.fm Draft Document for Review August 31, 2021 6:15 pm Note: Before using this information and the product it supports, read the information in “Notices” on page ix. First Edition (September 2021) This edition applies to Version 9, Release 2, of the DS8000 family of storage systems. This document was created or updated on August 31, 2021. © Copyright International Business Machines Corporation 2021. All rights reserved. Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Draft Document for Review September 3, 2021 10:06 am 8501TOC.fm Contents Notices . ix Trademarks . .x Preface . xi Authors. xi Now you can become a published author, too! . xiii Comments welcome. xiii Stay connected to IBM Redbooks . xiii Part 1. IBM System Storage DS8000 performance considerations . 1 Chapter 1. IBM System Storage DS8900F family characteristics. 3 1.1 The storage server challenge . 4 1.1.1 Performance numbers . 4 1.1.2 Recommendations and rules . 5 1.1.3 Modeling your workload . 5 1.1.4 Allocating hardware components to workloads. 5 1.2 Meeting the challenge: The DS8000 product family . 6 1.2.1 DS8900F family models and characteristics. 6 1.2.2 Advanced caching algorithms . 8 1.2.3 Performance with IBM Z . 10 1.2.4 Easy Tier. 11 Chapter 2. Hardware configuration . 15 2.1 DS8900F model similarities . 16 2.2 Central Processor Complexes & System Memory . 17 2.2.1 DS8000 caching algorithms . 17 2.3 Host adapters . 21 2.4 zHyperLinks . 22 2.5 High-Performance Flash Enclosure (HPFE) Gen-2 . 23 2.5.1 Device Adapters . 25 2.5.2 Flash Tiers . 25 2.5.3 Multiple paths to Open Systems servers. 26 2.5.4 Multiple paths to z Systems servers . 26 2.5.5 Spreading host attachments . 26 2.6 Tools to aid in hardware planning . 27 2.6.1 White papers. 27 2.6.2 Cache and I/O operations . 28 2.6.3 Determining the correct amount of cache storage . 29 Chapter 3. Logical configuration concepts and terminology . 31 3.1 Logical Configuration . 32 3.1.1 Array Sites . 32 3.1.2 Arrays . 33 3.1.3 Ranks . 36 3.1.4 Extent pools . 38 3.1.5 Logical volumes . 39 3.1.6 Easy Tier. 42 3.1.7 Logical subsystem . 46 © Copyright IBM Corp. 2021. iii 8501TOC.fm Draft Document for Review September 3, 2021 10:06 am 3.1.8 Address groups. 47 3.1.9 Volume access . 48 3.1.10 Summary of the DS8000 logical configuration hierarchy . 49 3.2 Data placement on ranks and extent pools. 50 3.2.1 Workload characteristics. 50 3.2.2 DS8900F Resource utilization. 51 3.2.3 Extent pool considerations . 51 3.2.4 Easy Tier considerations. 55 3.2.5 Configuration Hints . 56 Chapter 4. Logical configuration performance considerations . 59 4.1 DS8900F Models . 60 4.1.1 DS8910F. 60 4.1.2 DS8950F. 61 4.1.3 DS8980F. 62 4.1.4 Examples using Starter drive choices. 62 4.1.5 Easy Tier Overview. 64 4.1.6 IBM System Storage Easy Tier. 64 4.2 Configuration principles for optimal performance . 66 4.2.1 Workload isolation. 67 4.2.2 Workload resource-sharing. 69 4.2.3 Workload spreading . 69 4.2.4 Using workload isolation, resource-sharing, and spreading . 70 4.3 Analyzing application workload characteristics . 71 4.3.1 Determining skew and storage requirements for Easy Tier . 71 4.3.2 Determining isolation requirements. 71 4.3.3 Reviewing remaining workloads for feasibility of resource-sharing. 73 4.4 Planning allocation of disk and host connection capacity . 73 4.5 Planning volume and host connection spreading . 74 4.5.1 Spreading volumes for isolated and resource-sharing workloads. 74 4.5.2 Spreading host connections for isolated and resource-sharing workloads. ..