## Zones 

Since Version 7.2.2, you can create zones for managing your clusters when you manage a large group of clusters. Each zone contains a cluster or groups of clusters, and you can assign users and roles to this group of clusters. 

## Users 

You can create users and attach them to your zone and clusters. For each user, you define an email, phone number, and assign them a role in your zone. 

## Roles 

Each defined user has a role. The system now has six predefined roles: ha_root, ha_admin, ha_mon, ha_op, root, and an admin group for monitoring and operations. However, you can define your own customized roles for each user. 

## Health Summary 

Health Summary provides an overview of your zones; clusters; nodes; and resources groups, and you can drill down from zone to cluster. 

## Activity Log 

By using the Activity Log function, you can filter logs by cluster, zones, resources, users, event types, and date and time and its combinations. 

For more information about the PowerHA GUI, see Chapter 5, “PowerHA SystemMirror User Interface” on page 127. 

## 2.3 Resource Optimized High Availability enhancements 

This section describes the Resource Optimized High Availability (ROHA) enhancements. 

GLYPH<SM590000> ROHA Live Partition Mobility (LPM) support 

PowerHA SystemMirror listens to LPM events by registering with the AIX drmgr  framework and does necessary validations to handle the ROHA resources that might be impacted during the LPM process. 

GLYPH<SM590000> ROHA dynamic automatic reconfiguration (DARE) support 

You can change the Capacity on Demand (CoD) resource requirement for existing application controllers, add an application controller, or remove an application controller without stopping the cluster services. Applications are refreshed so that the new resource requirements are effective after DARE. 

GLYPH<SM590000> ROHA Hardware Management Console (HMC) Representational State Transfer (REST) API support 

ROHA was originally supported by SSH communication with HMC only. However, most cloud deployments with PowerHA operate by using the REST API of HMC. To help customers deploy and manage PowerHA in cloud environments, ROHA support is based on the REST API. 

GLYPH<SM590000> ROHA asynchronous release 

ROHA resource release can be asynchronous if the source and target nodes of the cluster are from different central electronic complexes (CECs). 

