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FS018-S Log file corrupt - unrecognizable record in file.
This error indicates that the marker in the record header is not recognized which implies that the log file has become corrupted in some way.
This error can occur if the last record of the recovery log file was not written successfully because of a system crash. The Recovery Utility will have processed all of the records up to the point of failure.
Resolution:
Ensure that the correct log file is available to the Fileshare Rollforward Recovery Utility.