Exchange 2010
update-MailboxDatabaseCopy -Identity 'DAG01DB12\MBX' -DeleteExistingFiles
A source-side operation failed. Error An error occurred while performing the seed operation. Error: Failed to open a log truncation context to source server 'MBX'. Hresult: 0x80070057. Error: An unexpected error occurred. Error (0x80070057).. [Database: DAG01DB12,
Server: MBX]
Failed to open a log truncation context to source server 'MBX'. Hresult: 0x80070057. Error: An unexpected error occurred. Error (0x80070057).
Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.2.328.9&t=exchgf1&e=ms.exch.err.Ex4543D9
Exchange Management Shell command attempted:
update-MailboxDatabaseCopy -Identity 'DAG01DB12\MBX' -DeleteExistingFiles
Unable to activate the Passive copy.