USN Journal is Almost Full

Ultrasound has detected that changes are being made to the volume faster than FRS can detect them in the USN journal and log them in the FRS database. The recommended USN journal size is 128 MB per 100,000 files on the volume. If the USN journal is too small for the number of files on the volume, including those outside of the replica tree, a USN journal wrap error can occur, which causes replication to cease and requires a nonauthoritative restore to correct.

Default USN journal sizes are as follows:

You can increase the size of the USN journal by modifying the registry, but keep in mind that after you increase it, you should not lower it again because this will cause a USN journal wrap.


Increase the USN journal size to 128 MB per 100,000 files on the volume.

  1. In the Run dialog box, type regedit.exe, and click OK.
  2. Navigate to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NtFrs\Parameters
  3. Right-click the Parameters subkey and choose New -> DWORD Value.
  4. Type NTFS journal size in MB as the new value name and press Enter.
  5. Right click NTFS journal size in MB and click Modify.
  6. Click Decimal, and then in the Value data field, type the size in megabytes that you would like to make the NTFS journal.
  7. Click OK, and then close the Registry Editor.
  8. At the command prompt, type net stop ntfrs & net start ntfrs