App Control: High Disk Utilization on Newly Booted VDIs
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App Control: High Disk Utilization on Newly Booted VDIs


Article ID: 286622


Updated On:


Carbon Black App Control (formerly Cb Protection)


  • High Disk Utilization at boot
  • Slower than average log in times


  • App Control Agent: All Supported Versions
  • Microsoft Windows: All Supported Versions
  • Virtual Environment


The VDI device is reporting large numbers of changes in the USN Journal which causes the Agent to conduct a cache check, to find all the changes made. 


  1. Verify that the VDI Golden Image is in its own Policy.
  2. Navigate to https://ServerAddress/agent_config.php
  3. Click Show Filters > Value > contains > usn_journal_flags > Apply
  4. Either modify the existing Agent Config for the VDI Policy, or click Add Agent Config and use the following:
    • Name: Disable CC3 on USN Journal Reported Changes
    • Host ID: 0
    • Platform: Windows
    • Value:
    • Policy: Select the relevant VDI Policy (or Policies)
    • Status: Enabled
  5. Save the Agent Config and verify the changes are applied to the Golden Image (and Clones) accordingly.

Additional Information

For more information regarding these and other changes please see the document