7.3

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A system administrator can change the authentication method used to access the SQL database
during run time (after the installation is complete). See Configuring Windows Service to Access the
IaaS Database.
Installing Distributed Execution Managers
You install the Distributed Execution Manager as one of two roles: DEM Orchestrator or DEM Worker. You
must install at least one DEM instance for each role, and you can install additional DEM instances to
support failover and high-availability.
The system administrator must choose installation machines that meet predefined system requirements.
The DEM Orchestrator and the Worker can reside on the same machine.
As you plan to install Distributed Execution Managers, keep in mind the following considerations:
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DEM Orchestrators support active-active high availability. Typically, you install one DEM Orchestrator
on each Manager Service machine.
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Install the Orchestrator on a machine with strong network connectivity to the Model Manager host.
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Install a second DEM Orchestrator on a different machine for failover.
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Typically, you install DEM Workers on the IaaS Manager Service server or on a separate server. The
server must have network connectivity to the Model Manager host.
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You can install additional DEM instances for redundancy and scalability, including multiple instances
on the same machine.
There are specific requirements for the DEM installation that depend on the endpoints you use. See IaaS
Distributed Execution Manager Host.
Install the Distributed Execution Managers
You must install at least one DEM Worker and one DEM Orchestrator. The installation procedure is the
same for both roles.
DEM Orchestrators support active-active high availability. Typically, you install a single DEM Orchestrator
on each Manager Service machine. You can install DEM Orchestrators and DEM workers on the same
machine.
Prerequisites
Download the vRealize Automation IaaS Installer.
Procedure
1 Right-click the [e-mail] setup file and select
Run as administrator.
2 Click Next.
3 Accept the license agreement and click Next.
Installing vRealize Automation
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