Windows File Level Restore hangs on "Starting restore session"

KB ID: 2160
Product: Veeam Backup & Replication
Version: all
Published: 2016-09-01
Last Modified: 2021-10-20
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Challenge

Windows File Level Restore hangs on "Starting restore session" for abnormally long period of time while free disk space on drive C:\ keeps decreasing dramatically on the machine where the Veeam Backup & Replication Console is launched.


You may that find the following location of the cache file constantly growing:

C:\Windows\system32\config\systemprofile\AppData\Local\mount_cache{GUID}

or

C:\Windows\SysWOW64\config\systemprofile\AppData\Local\mount_cache{GUID}.
 

Cause

The issue occurs when guest Windows has Transactional NTFS (TxF) turned on. When mounting to Veeam server it can cause NTFS driver to enter infinite loop trying to re-apply transaction log.

Solution

To resolve:

  1. Login to the guest OS of the machine being backed up as administrator.
  2. Open an Administrative Command Prompt
  3. Execute 2 following commands for each logical disk in VM.
    Example for disk C:
    • fsutil resource setautoreset true C:\
    • fsutil resource setavailable C:\
  4. Run the backup job to create a new restore point.
    Note: This will correct the issue for all future restore points, and is not retroactive.
  5. Test the Windows File Level Restore again

More information

For more information about Transactional NTFS (TxF)

https://docs.microsoft.com/en-us/windows/win32/fileio/transactional-ntfs-portal
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