Log replay for corrupt files (CCR)
In Exchange 2007 if a log file on the active node is corrupted an attempt to re copy that log file will occur.
Log files are inspected via LogInspector and moved to the passive log directory. LastLogInspected is updated when a log is successfully inspected.
If log copying or the log file inspection fails, the Replication service will attempt to recopy the log file and inspect it again. The Replication service will do this three times before marking the log file as irrecoverable and requiring a database reseed.
For full deep dive details on Exchange 2007 CCR see Continuous Replication Deep Dive
Written by Daniel Kenyon-smith