Hi,

My company have two exchange 2010 SP1 servers with DAG configuration with OS widows server 2008 R2 in testing entironment.

Today i want to test my backup possibility, so i restore the backup data to another location not original location. I dismount the database and then delete the all files under the database location. last I copy back the files from back up location to database location. When i want to mount the database. It will come out the below error!

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Microsoft Exchange Error
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Failed to mount database 'mail2'.
mail2FailedError:

Couldn't mount the database that you specified. Specified database: mail2; 
Error code: An Active Manager operation failed. Error: The database action failed. 
Error: Operation failed with message: MapiExceptionCallFailed: Unable to mount
database. (hr=0x80004005, ec=1011)

[Database: mail2, Server: mail2.e0594.cn].

An Active Manager operation failed. Error: The database action failed. 
Error: Operation failed with message: MapiExceptionCallFailed: Unable to mount
database. (hr=0x80004005, ec=1011)

[Database: mail2, Server: mail2.e0594.cn]

An Active Manager operation failed. Error: Operation failed with message: 
MapiExceptionCallFailed: Unable to mount database. (hr=0x80004005, ec=1011)

[Server: mail2.e0594.cn]

MapiExceptionCallFailed: Unable to mount database. (hr=0x80004005, ec=1011)

Any suggestion? Thanks!