This IBM® Redpaper™ publication describes the concepts, functions and practical usage of IBM Easy Tier® Heat Map Transfer (HMT). Along with Easy Tier Server and Easy Tier Application, Easy Tier Heat Map Transfer is an enhancement that is included in the fifth-generation Easy Tier, which is available with the IBM System Storage DS8000 Licensed Machine Code (LMC) 7.7.10.xx.xx or later.
IBM System Storage DS8000 Easy Tier is designed to automate data placement throughout the storage system disks pool. Easy Tier generates a heat map. It is a workload activity metric for each extent in a logical volume.
With Easy Tier HMT, it is possible to transfer the heat map from a mirrored primary site and reapply it periodically at the secondary site by using the Easy Tier Heat Map Transfer Utility (HMTU). This capability helps maintain storage performance after a failover to the secondary site.
This paper is for those professionals who want to understand the Easy Tier HMT concept and its underlying design. It also provides guidance and practical illustrations on the operation of the HMTU.
Table of contents
Chapter 1. Overview
Chapter 2. Easy Tier Heat Map Transfer architecture and design
Chapter 3. Heat Map Transfer Utility installation and usage