Forcing a full re-seed of a Exchange 2010 DAG replica
This can be done either using the EMC or EMS. However I advise to use EMS in this instance, as using the EMC will not give you a status bar (whereas using the EMS will).
Update-MailboxDatabaseCopy -Identity DB1\MBX1 – DeleteExistingFiles
DB1 is the name of the database
MBX1 is the name of the target server requiring a reseed
N.B “DeleteExistingFiles” forces Exchange to remove any existing copies of the database from the target server (MBX1) and can be omitted if the files have been removed manually.