Issue：
The seeding operation failed.
Error: An error occurred while performing the seed operation.
Error: Failed to open a log truncation context to source server ExcBE03.syinsh.com.
Hresult: 0xc7ff1004.
Error: Error returned from an ESE function call (-1305).
Incremental seeding of database DBPriority2\EXCBE02 encountered an error.
A full reseed is required.
Error: The incremental reseed process failed. A full reseed is now required.
Reason: The log stream for passive database copy DBPriority2\EXCBE02 has no common log files with the active database copy on server ExcBE03.syinsh.com.. Error: 0
Error: The seeding operation failed.
Error: An error occurred while performing the seed operation.
Error: Failed to open a log truncation context to source server ExcBE03.syinsh.com.
Hresult: 0xc7ff1004.
Error: Error returned from an ESE function call (-1305).
Resolution:
Source Server : ExcBE03.syinsh.Com
Target/failing server : ExcBE03.syinsh.Com
Database name: DB2
DB location : D:/Database
Logs Location: D:/Database/Logs
on the target Server where the Database is Failing/ or being Added to...
1) Delete the Failing Database
2) Add the database copy : Add-MailboxDatabaseCopy -Identity DB2 -MailboxServer ExcBE02 -ActivationPreference 2
3) You will see same ERROR: no worries
4) Go to the Database Folder location : D:/Database/Logs
5) Move all the log files to another location
6) Open Exchange Management shell and run: Update-MailboxDatabaseCopy "DB2\ExcBE02" -SourceServer ExcBE03 -Verbose
and your database will start seeding...
Remember not to Logoff or Close the Shell else it will stop seeding...