Maintaining Exchange Server in full health is a challenge to Exchange administrators as a variety of hardware and software threats create hurdle every time. Whenever there is a dirty-shutdown situation, the transaction log file is either deleted or becomes corrupt. That’s why the database fails to mount, and administrators cannot mount it back with any manual technique.
The error which you will see when you fail to mount the database is following –
Error: Exchange is unable to mount the database that you specified. Specified database: ServerName\First Storage Group\Exchange Database; Error Code: MapiExceptionCallFailed: Unable to mount database. (hr=0x80004005, ec=-528).
The manual approach of mounting the database back to Exchange involves repairing it with the help of the ESEUTIL tool. It is an inbuilt tool of Exchange which runs on a command line environment and uses various switches to perform different operations. ESEUTIL tool
You can see ESEUTIL at its default location
The ESEUTIL switches check the health of the database and modify or repair it as per the need. Here is its list –
- /D – It defragments the database and reduces the size of the database by removing the space. It also rebuilds the index.
- /P – It performs the soft recovery of the database but skips the part of the database it cannot repair.
- /C – It runs a hard recovery of the database.
- /R – It is an essential switch as it restores the database by replaying the transaction log files bringing the database to a consistent state.
- /G – It checks database integrity at page and ESE level.
- /M – It accesses the information related to the log files and presents headers of the database file, transaction file, and checkpoint file.
- /K – It checks and verifies the checksum of database and transaction log files.
- /Y – It copies the large database file and manages them efficiently.
Now, you can go for the recovery by following the below steps –
- Check the consistency of the database.
Eseutil /mh ‘ExchangeDatabase.edb’
The command will return the information about the database, and if the state option shows dirty shutdown, then you need to run the repair command.
- Run the soft repair
Eseutil/r ‘ExchangeDatabase.edb’
The soft repair will work fine till only the log files are missing, but if the corruption is severe, then it will not work fine, and you have to go for the hard recovery.
- Run the hard repair
Eseutil /p ‘ExchangeDatabase.edb’
The hard repair will remove the corrupt data items from the database and allows only the healthy item to stay. But, Exchange experts advise not to go for a hard recovery option because you will lose the precious data.
After running the hard recovery, rerun the first command and check the status of the database. If it shows the clean shutdown status, then mount the database back to the Exchange.Mount-MailboxDatabase -Identity ‘DatabaseName’
Limitations of ESEUTIL tool
- ESEUTIL deletes the corrupt data; it can delete some data important to your business also.
- You need to make much space to run the ESEUTIL tool as it defragments the database and if the size of the database is large, then it will create further issues.
- You need to run ESEUTIL tool multiple times and then use the ISINTEG tool.
- As you need to run the ESEUTIL tool multiple times, so the recovery procedure takes much time.
- Only a seasoned Exchange administrator can efficiently use the ESEUTIL tool and recover the data completely.
If you do not want to face any threat to your data while recovering it, then you can use Kernel for Exchange Server Recovery software. It can access the dismounted database and recover the data to a production Exchange Server.
Kernel for Exchange Server
Kernel for Exchange Server is a recovery software which is specially designed for Microsoft Exchange Server. It allows to recover corrupt and deleted folder in Exchange 2010. The Exchange server recovery tool supports each version including the latest Exchange Server 2019. It does not require log files to recover the corrupt databases. And after recovery, you can directly save the data to a live Exchange.
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