The disk on a monitored file server is overfilled

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Symptoms The disk on a monitored file server is overfilled with Security event log auto archives. 
Cause
Disk overfilling can be caused by the following reasons: 
  • Removal of processed auto archives is not configured. 
  • The maximum size of the Security event log does not meet Microsoft recommendations, so Netwrix Auditor cannot process auto archives and remove them. 
  • The disk where auto archives are stored is too small to contain all archives accumulated between two netwrix Auditor data collections.
Resolution
  1. Check whether the automatic removal is configured. On the computer where Netwrix Auditor is installed, perform the following:
    1. Navigate to Start --> Run and type regedit.
    2. Expand HKEY_LOCAL_MACHINE/SOFTWARE/(Wow6432Node)/Netwrix/File Server Change Reporter.
    3. Make sure ProcessBackupLogs is set to 1.
    4. Make sure CleanAutoBackupLogs is set to X - a positive integer number (the archive is removed when all events are older than X hours).
Refer to Netwrix Auditor Installation and Configuration Guide  for more information.
  1. If the automatic removal option is enabled, check the audit archives creation date.
    • If archives are stored longer than it is defined by the limiting CleanAutoBackupLogs parameter, make sure that Security event log can be reached by Netwrix Auditor, and the log’s size meets Microsoft requirements.
    • If archives are not stored longer than it is defined by the limiting CleanAutoBackupLogs parameter, and Security event log can be reached by Netwrix Auditor, and the log’s size meets Microsoft requirements, it means that audit archives fill the free disk space before Netwrix Auditor removes them. To resolve this issue, do one of the following:
      • Change location of the Event Viewer log files. Move them to a disk with more free space available. Audit archives will be accumulated on the disk and removed after the data collection. 

        Note:For information on how to do this for Windows 2000 and Windows Server 2003, refer to the following Microsoft technical article. For Windows Server 2008 and above, log location can be changed under the log properties. It is recommended to reboot your server after this manipulations. 

      • Configure Netwrix Auditor to run data collection more frequently and decrease the value of the CleanAutoBackupLogs parameter. If the task runs frequently enough to prevent the Security event log from being overfilled, you can disable the automatic archiving option (the disk will not be overfilled, but this can lead to audit data loss). To adjust the data collection schedule, in Netwrix Auditor, navigate to Settings --> Data Collection, click Modify next to Default data collection and Change Summary generation schedule. In the Modify Schedule dialog select Advanced and adjust the schedule as necessary. 
Note: Before updating the CleanAutoBackupLogs parameter, make sure that Netwrix Auditor has enough time to process audit archives for other audited systems before the archives are removed.
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