Zones Users Roles Health Summary Activity Log 2.3 Resource Optimized High Availability enhancements 26  IBM PowerHA SystemMirror V7.2.3 for IBM AIX and V7.2.2 for Linux ROHA resource release can be asynchronous if the source and target nodes of the cluster  are from different central electronic complexes (CECs). 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.  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. 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. This section describes the Resource Optimized High Availability (ROHA) enhancements. For more information about the PowerHA GUI, see Chapter 5, “PowerHA SystemMirror User  Interface” on page 127. By using the Activity Log function, you can filter logs by cluster, zones, resources, users,  event types, and date and time and its combinations. Health Summary provides an overview of your zones; clusters; nodes; and resources groups,  and you can drill down from zone to cluster. 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. 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. 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. GLYPH<SM590000> ROHA Live Partition Mobility (LPM) support GLYPH<SM590000> ROHA dynamic automatic reconfiguration (DARE) support  GLYPH<SM590000> ROHA Hardware Management Console (HMC) Representational State Transfer (REST)  API support GLYPH<SM590000> ROHA asynchronous release