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Microsoft Knowledge Base article Q304914 contains:
SUMMARYThe File Replication service (FRS) creates text-based log files in the %Systemroot%\Debug folder that you can use to troubleshoot FRS-replication problems. To assist in reading these logs, identifiers are included in the log files that record what operation the FRS engine is completing. This article provides descriptions of these identifiers.
MORE INFORMATIONIdentifiers that are included in the log files:
|::||Change order trace records|
|:DS:||DS access entries|
|:FK:||FRS registry key entries|
|:H:||Log header entries|
|:S:||Service startup and shutdown entries|
|:SC:||Service controller entries|
|:SR:||Send/receive command server entries|
|:T:||Tracking record (>SP2 hotfix and SP2)|
|:U:||USN journal entries|
|:V:||Version vector join entries|
To more easily identify errors, warning messages, and milestone events in the log files, you might need to filter out less important information. FRS log content is designed to be filtered easily. All log records have a date and time stamp and an identifying string annotated by :: with a letter or pair of letters between each colon. For example, a log entry that has a :U: as an identifying string includes information that is related to the NTFS USN journal. A log entry that contains information about directory service polling has an identifying string of :DS:. A tracking log entry has an identifying string of :T:, and summarizes a change order that has finished or is in the process of updating a given file or folder.
Use the Findstr.exe utility to log events of interest. For example, to view tracking records, use the findstr /I ":T:" %systemroor%\ntfrs_*.log command. For additional information about FRS log file size and verbosity settings, click the article number below to view the article in the Microsoft Knowledge Base:
221112 NT File Replication Service Log File Size and Verbosity SettingsFor additional information about tracking log entries, click the article number below to view the article in the Microsoft Knowledge Base:
274581 Changes in the File Replication Service Logging Process in SP2