This IBM® Redpaper™ publication describes the concepts and functions of IBM System Storage® Easy Tier® and explains its practical use with the IBM DS8870.
The IBM DS8000 Easy Tier feature and the accompanying Storage Tier Advisor Tool are described in this paper.
IBM DS8000 Easy Tier is designed to automate data placement throughout the storage system disks pool. It enables the system (automatically and without disruption to applications) to relocate data (at the extent level) across up to three drive tiers. The process is fully automated. Easy Tier also automatically rebalances extents among ranks within the same tier, removing workload skew between ranks, even within homogeneous and single-tier extent pools.
Easy Tier supports a Manual Mode that enables the user to relocate full volumes. Manual Mode also offers the ability to merge extent pools and to restripe volumes within an extent pool. A rank depopulation function is also offered. Easy Tier fully supports thin provisioned fixed-block volumes in Manual Mode and Automatic Mode.
The sixth generation of Easy Tier, available for IBM DS8870 with Release 7.3 code or later, supports the high-performance flash enclosure flash cards.
This paper is aimed at those professionals who want to understand the Easy Tier concept and its underlying design. It also provides guidance and practical illustrations for users who want to use the Easy Tier Manual Mode capabilities.
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Table of contents
Chapter 1. IBM DS8000 Easy Tier overview
Chapter 2. DS8000 Easy Tier concepts, design, and implementation
Chapter 3. Planning for DS8000 Easy Tier
Chapter 4. DS GUI and DS CLI support for DS8000 Easy Tier
Chapter 5. Using DS8000 Easy Tier
Appendix A. IBM DS8000 Easy Tier and IBM z/OS system-managed storage