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Windows File Level Restore hangs on "Starting restore session"

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.
You may find following path with 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 guest OS as administrator. Run cmd with elevated privileges. Execute 2 following commands for each logical disk in VM. Example for disk C:
fsutil resource setautoreset true C:\
fsutil resource setavailable C:\


2. Make a new backup point of that VM. verify that File Level Restore starts fine from new backup point

More information

For more information about Transactional NTFS (TxF)
https://msdn.microsoft.com/ru-ru/library/windows/desktop/bb968806(v=vs.85).aspx
KB ID:
2160
Product:
Veeam Backup & Replication
Version:
all
Published:
2016-09-01
Last Modified:
2020-08-13
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