This IBM® Redpaper™ publication describes the concepts and functions of IBM System Storage® Easy Tier® and explains its practical use with the DS8870.
Easy Tier is designed to automate data placement throughout the storage system disks pool. It enables the system to (automatically and without disruption to applications) 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 (extent space-efficient (ESE)) in Manual Mode and Automatic Mode.
The seventh generation of Easy Tier that is available for IBM DS8870 with Release 7.4 code supports the high-performance flash enclosure flash cards and enables addditional user controls at the pool and volume levels.
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.
Easy Tier includes additional capabilities to further enhance your storage performance automatically: Easy Tier Server, Easy Tier Application, and Easy Tier Heat Map Transfer.
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