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. 

Note:  Easy Tier Server has been removed from marketing support. It is replaced with the Flash Cache option of IBM AIXfi 7.2. 

The following Easy Tier controls are also available: 

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 issuing the command chsi -etsrmode enable . 

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 Hybrid systems can be changed between the High-Utilization  tiers (default), Enterprise →  Flash Tier 1 →  Flash Tier 2 → Nearline →  Flash Tier 0, or the High-Performance  tiers, Flash Tier 0 →  Flash Tier 1 →  Flash Tier 2 →  Enterprise →  Nearline. 

– The data allocation or der for All-Flash systems can be changed between the 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> IBM DS8000 Easy Tier (for DS8880 R8.5 or later) , REDP-4667 

GLYPH<SM590000> DS8870 Easy Tier Application , REDP-5014 

GLYPH<SM590000> IBM DS8870 Easy Tier Heat Map Transfer , REDP-5015 

## Host adapters 

The DS8880 offers 16 Gbps and 8 Gbps Fibre Channel host adapters: 

GLYPH<SM590000> The 16 Gbps FC adapter has four 16 Gbps-capable ports. Each port independently auto-negotiates to 4, 8, or 16 Gbps link speed, and it can be configured to FCP or FICON. 

GLYPH<SM590000> The 8 Gbps FC adapter has four or eight 8 Gbps-capable ports. Each port independently auto-negotiates to 2, 4, or 8 Gbps link speed, and it can be configured to FC-AL, FCP, or FICON. 

For more information, see Chapter 2, “IBM DS8880 hardware components and architecture” on page 25. 

## Storage Hardware Management Console (HMC) for the DS8880 

The HMC is the focal point for maintenance activities and contains a version of Copy Services manager (CSM). The HMC is a dedicated workstation that is physically inside the DS8880. 

The HMC can proactively monitor the state of your system and notify you and IBM when service is required. It can also be connected to your network to enable centralized management of your system by using the IBM data storage command-line interface (DS CLI). 

The HMC supports the IPv4 and IPv6 standards. For more information, see Chapter 8, “IBM DS8880 Management Console planning and setup” on page 219. 

