Draft Document for Review December 5, 2019 4:35 pm 8456ch_Introduction.fm Chapter 1. Introduction to the IBM DS8900F  13 GLYPH<SM590000> 800 GB, 1.6 TB, and 3.2 TB drives for High-Performance Flash requirements  GLYPH<SM590000> 1.92 TB (DS8910F only), 3.84 TB, 7.68 TB, and 15.36 TB drives for various High-Capacity  Flash requirements. GLYPH<SM590000> Easy Tier Application is an application-aware storage utility to help deploy storage more  efficiently by enabling applications and middleware to direct more optimal placement of the  data by communicating important information about current workload activity and  application performance requirements. It is possible for Db2 applications in z/OS  environments to give hints of data placement to Easy Tier at the data set level. GLYPH<SM590000> Easy Tier Heat Map Transfer (HMT) can take the data placement algorithm on the Metro  Mirror/Global Copy/Global Mirror (MM/GC/GM) primary site and reapply it to the  MM/GC/GM secondary site when failover occurs by using the Easy Tier Heat Map  Transfer Utility (HMTU). With this capability, the DS8000 systems can maintain  application-level performance. The Easy Tier HMT functions support Metro/Global Mirror  (MGM) to transfer a heat map automatically to a tertiary site. GLYPH<SM590000> For Easy Tier to function effectively, it needs some free extents in each extent pool to be  able to move extents around. Rather than having the storage administrator monitor  capacity, the system can reserve some space for Easy Tier extent movements. You can  enable space reservation for Easy Tier by staying with  chsi -etsrmode enable  (is enabled  by default). GLYPH<SM590000> Another control is the allocation policy for new volumes. You can control the allocation  policy according to your needs with the  chsi  command and the  -ettierorder highutil  or  highperf :  The data allocation order for All-Flash systems can be changed between the settings  High-Utilization : Tiers Flash Tier 1  Flash Tier 2  Flash Tier 0, or the default  High-Performance:  Tiers Flash Tier 0  Flash Tier 1  Flash Tier 2. For more information about the Easy Tier features, see the following resources: GLYPH<SM590000> DS8870 Easy Tier Application , REDP-5014 GLYPH<SM590000> IBM DS8870 Easy Tier Heat Map Transfer , REDP-5015 GLYPH<SM590000> IBM DS8000 Easy Tier (for DS8000 R9.0) , REDP-4667 The following Easy Tier controls are also available: Note:  Easy Tier Server has been removed from marketing support. It is replaced with the  Flash Cache option of IBM AIXfi 7.2. Easy Tier enables the DS8000 to automatically balance I/O access to disk drives to avoid hot  spots on disk or flash arrays. Easy Tier can place data in the storage tier that best suits the  access frequency of the data. Highly accessed data can be moved nondisruptively to a higher  tier, for example, to 1.6-TB Flash Tier 0 drives. Cold data or data that is primarily accessed  sequentially is moved to a lower tier of high-capacity drives. Easy Tier includes additional  components: IBM Easy Tier Flash drives provide up to 100 times the throughput and 10 times lower response time than  15K RPM spinning drives. They also use less power than traditional spinning drives. For more  information, see Chapter 7, “IBM DS8900F physical planning and installation” on page 179. All flash drives in the DS8900F are encryption-capable. Enabling encryption is optional. It  requires at least two key servers with the IBM Security Key Lifecycle Manager software, or the  Gemalto Safenet, OASIS Key Management Interoperability Protocol (KMIP) compatible  software.