High density robots in Unattended Robot

  • Release version: Yokohama
  • Updated January 30, 2025
  • 2 minutes to read
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    Summary of High Density Robots in Unattended Robot

    High density robots enable you to execute multiple automations simultaneously and independently on a single Windows Server machine. This capability allows each robot to run one automation per Windows user session, supporting concurrent executions of the same or different automations across multiple sessions. This is particularly useful for maximizing resource utilization on servers configured with Remote Desktop Session Host (RDSH).

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    How High Density Robots Work

    • A single robot can manage one automation per user session concurrently.
    • If a user initiates an execution remotely (e.g., via RDP), their session disconnects and transfers control to the robot, but the user can reconnect to monitor progress.
    • Switching between high density and standard robot types requires reconnecting the unattended robot to maintain smooth automation execution.

    Configuration Steps

    To set up high density robots, follow these key tasks:

    • Prepare a Windows Server machine by installing Remote Desktop Session Host and adding authorized users who can establish RDP connections.
    • Restart the server after installation completes.
    • Enable the high density robot option within RPA Hub when creating unattended robots.
    • Install the Unattended Robot application on the server.
    • Add multiple user profiles within the Unattended Robot application to allow concurrent job execution by multiple robots.

    Troubleshooting

    • RDP logon errors are logged in service logs; use disconnect reason codes to identify issues.
    • Ensure application process names in automations match the target server environment to prevent execution discrepancies.

    Limitations

    • The Unattended Robot user interface can only be accessed by one user at a time.
    • After upgrading RPA Hub, the latest Unattended Robot version must be installed.
    • High density robots are not included in robot pools.

    Execute multiple automations simultaneously and independently on a single Windows Server machine using high density robots.

    Familiarize yourself with high density robots concepts in RPA Hub. For more information, see High density robots in RPA Hub.

    How a high density robot works

    • The robot can start one automation for each Windows user session at any given time. You can run the same automation on all robots simultaneously. You can also run different automations on all robots at the same time.
    • In a scenario, where, a user A is connected to a server via Remote Desktop Protocol (RDP) where a high density robot is connected. If an execution is triggered for the same user A, the manually connected session is disconnected and transferred to the robot. However, the user can reconnect to view the execution after the robot starts its automation.
    • When changing the robot type from High Density Robot to standard or vice-versa, you must reconnect the unattended robot to ensure seamless execution of automations. For more information about creating an unattended robot, see Create an unattended robot in RPA Hub.

    List of steps for configuring high density robots

    Perform the following tasks to configure high density robots:
    1. Set up the environment for high density robots on a Windows Server machine by installing a Remote Desktop Session Host. Then, add users who can establish RDP connection to the Windows Server machine. For more information, see Set up Windows Server machine for high density robots.
    2. Restart the Windows Server machine after the installation is complete.
    3. Enable the high density robot option in RPA Hub. For more information, see Create an unattended robot in RPA Hub.
    4. Install Unattended Robot.
    5. Add user profiles in the Unattended Robot application, so that multiple robots can execute jobs concurrently. For more information, see Set up Unattended Robot.

    Troubleshooting

    • RDP logon errors are recorded in the service logs. Although some logs may lack detailed explanations, utilize the code to search for relevant information in Disconnect reason code and Extended disconnect reason code.
    • The underlying application process names used in automations may vary between the server environment and the development environment. To avoid discrepancies, ensure they are correctly specified in the automations based on the target machine.

    Limitations

    • The Unattended Robot user interface is accessible by only one user at a time.
    • The latest version of the Unattended Robot must be installed after upgrading the RPA Hub to the newest version.
    • High density robots are not a part of robot pool.