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How to Recover an Exchange 2013 Database from an Inaccessible Drive
Question details
The user needs to recover a Microsoft Exchange 2013 database and its transaction logs located on a drive that has become inaccessible.
- Product
- Microsoft Exchange Server 2013
- Device & OS
- not provided
- Scenario
- The storage drive containing the critical Exchange database and transaction log files has failed or become inaccessible, preventing the database from mounting.
- Observed behavior
- The Exchange database cannot be accessed or mounted, leading to email service disruption and requiring safe data extraction or restoration without risking further corruption.
Do not reinstall Exchange or run any disk repair operations (like CHKDSK) on the original inaccessible drive before preserving the data, as this can cause irreversible data loss.
Restore the Database from a Backup Using a Recovery Database
The safest and recommended approach is to restore your Exchange database and log files from a known good backup to an alternative drive.
By restoring your backup to an Exchange Recovery Database (RDB), you can extract mailbox data using the Exchange Management Shell without affecting your live production environment.
Use your backup solution to restore the Exchange 2013 database (.edb) and transaction log files to a healthy, accessible drive on your server.
Open the Exchange Management Shell and run the 'New-MailboxDatabase' cmdlet with the '-Recovery' switch, pointing the EDBFilePath and LogFolderPath to the restored files.
Mount the newly created recovery database by executing the 'Mount-Database' cmdlet in the Exchange Management Shell.
Use the 'New-MailboxRestoreRequest' cmdlet to extract mailboxes from the recovery database and merge them directly into your production mailboxes.
Use Professional Data Recovery Software
If no backup is available and the drive is not physically destroyed, you can attempt to retrieve the database files using data recovery utilities.
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Frequently Asked Questions
Should I try to repair the inaccessible drive first before recovering the database?
No. Running repair operations on a failing or inaccessible drive can permanently overwrite or destroy remaining data. Always attempt to extract or copy the data to a new location first.
What is an Exchange Recovery Database (RDB)?
An Exchange Recovery Database is a special kind of mailbox database that allows you to mount a restored database offline and extract data from it without disturbing user access to current production databases.
How do I know if my recovered Exchange database is safe to mount?
You should use the Eseutil utility (specifically the command 'Eseutil /mh') to check the header information of the database. It is safe to mount if the state is listed as 'Clean Shutdown'.
