ERROR_LOG_APPENDED_FLUSH_FAILED - 6647 (0x19F7)
Records were appended to the log or reservation changes were made, but the log could not be flushed.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_LOG_APPENDED_FLUSH_FAILED (6647, 0x19F7) indicates that an attempt to append records to a log or make reservations for future log entries was successful. However, the system encountered a failure when attempting to flush these changes to the log file.
Error Details
This error typically occurs during operations involving log files, such as appending new data or making space reservations within the log. The flushing process is crucial for ensuring that all pending writes are committed to the disk, thereby maintaining the integrity and consistency of the log.
Usage Context
The context in which this error might occur includes:
- Logging operations: When an application attempts to write new data to a log file or reserve space for future entries.
- System maintenance tasks: During periodic system checks or maintenance routines that involve flushing logs.
- Application crashes: If an application terminates unexpectedly, it may not have the opportunity to flush all pending writes before termination.
Developer Interpretation
Developers should interpret this error as a failure in the log file's write operations. It suggests that while data was successfully appended or space reserved, the system encountered issues when attempting to ensure these changes were permanently stored on disk. This could indicate problems with the underlying storage device, file system, or the log file itself.
Related Errors
ERROR_DISK_FULL(0x700): Indicates that there is insufficient free space on the volume where the log resides.ERROR_LOG_CORRUPTION(0x19F8): Suggests a more severe issue with the integrity of the log file, which may require recovery or repair.
FAQ
Q: What does this error mean?
A: This error indicates that while data was appended to a log or space reserved for future entries, the system failed to flush these changes to disk.
Q: How can I troubleshoot this issue?
A: Review the context in which the operation was performed and ensure that there is sufficient free space on the volume where the log resides. Verify that the file system and storage device are functioning correctly.
Summary
ERROR_LOG_APPENDED_FLUSH_FAILED (6647, 0x19F7) is a specific error code indicating a failure in flushing changes to a log file after appending records or making reservations for future entries. Developers should focus on ensuring that the underlying storage and file system are functioning correctly to prevent this issue.