What does Windows error code 6640 (ERROR_LOG_CONTAINER_WRITE_FAILED) mean?

ERROR_LOG_CONTAINER_WRITE_FAILED

Log service encountered an error when attempting to write to a log container.

ERROR_LOG_CONTAINER_WRITE_FAILED is Win32 error 6640 (0x000019F0) and concerns writing data to a CLFS log container.

Where the result appears

• appending a transaction record.
• writing a restart area.
• extending a log into a new container.
• persisting records before a dependent data-file update.

What to verify

Verify whether the selected container accepts the requested write and makes the expected bytes available to CLFS. Check container identity and write offset, record length and marshaling sizes, and free space, quota, and allocation status.

Likely causes

• the volume is full or quota constrained.
• the container became read-only or inaccessible.
• the storage stack rejected or partially completed the write.
• a handle or stream mapping became stale.
• file-system corruption prevents allocation or completion.

Troubleshooting steps

1. Collect container identity and write offset.
2. Record record length and marshaling sizes.
3. Correlate free space, quota, and allocation status with the owning application log, CLFS-related System events, storage events, and any transaction or recovery trace.

Handling, retry, and recovery

Stop dependent commits, preserve the first I/O status, restore writable storage or capacity, and verify the log before resuming writers.

Related errors

ERROR_LOG_APPENDED_FLUSH_FAILED means records were appended but durability could not be confirmed; this code means the container write operation itself failed.

Example

A database appends a recovery record while the log volume is at quota. The append fails before the data page is changed; increasing the quota and verifying the container permits a safe retry.

References

• Microsoft: Win32 system error range containing this code
• Microsoft: Common Log File System
• Microsoft: Creating a Log File
• Microsoft: Introduction to CLFS