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:

• Prior to Windows 2000 SP3, the default journal size is 32 MB and the maximum journal size is 128 MB.
• In Windows 2000 SP3, the default journal size is 128 MB, and the maximum journal size is 10,000 MB.
• In Windows 2000 SP3 with the post-Service Pack 3 release of Ntfrs.exe, described in article 815473, and Windows 2000 SP4, the default journal size is 512 MB.
• In Windows Server 2003, the default journal size is 128 MB. After you install the pre-Service Pack 1 release of Ntfrs.exe as described in article 823230, the default journal size is 512 MB.

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.

Resolution

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

Caution

• Do not edit the registry unless you have no alternative. The registry editor bypasses standard safeguards, allowing settings that can damage your system, or even require you to reinstall Windows. If you must edit the registry, back it up first and see the Registry Reference on the Microsoft Windows Server 2003 Resource Kit companion CD or at http://www.microsoft.com/reskit.