GRT enabled backup of a virtual machine using the Backup Exec Agent for VMware Virtual Infrastructure (AVVI) reports exception "Directory does not support GRT" if that virtual machine contains a spanned volume of size 2TB or more

Problem

A Granular Recovery Technology (GRT) enabled backup of a virtual machine using the Backup Exec Agent for VMware Virtual Infrastructure (AVVI reports the exception - Directory does not support GRT), if that virtual machine contains a spanned volume of size 2TB or more .

 

Error Message

V-79-57344-38724 - Directory 'Name' does not support Granular Recovery Technology (GRT).  Granular restores cannot be performed for items in this directory

 

The Backup Exec Remote Agent debug log reports the following error while the job is running:

[2856] 05/16/10 09:00:19 VDiskMounter::MountAllDisks: failed to GetVolumeInformation, error 1392, \\?\C:\Program Files\Symantec\Backup Exec\Data\VMNAME-15-05-2010-12-05\MP00\E\ 
[2856] 05/16/10 09:00:21 VDiskMounter::MountAllDisks: failed to GetDiskFreeSpaceEx, error 1392, \\?\C:\Program Files\Symantec\Backup Exec\Data\VMNAME-15-05-2010-12-05\MP00\E\

 

Cause

VM-Ware support confirmed that this limitation is caused by vixMntapi not being able to access anything beyond the first 2 TB of a mounted volume.

https://www.vmware.com/support/developer/vddk/VDDK-501-ReleaseNotes.html

  • vixMntapi on Windows can access only the first 2TB of a volume.

    The vixMntapi functions can be used to mount a Windows volume larger than 2TB. However, attempts to access files on the resulting mount may result in this error message: “The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume.” Customers should not run chkdsk in this case. Even if the message does not appear, there is a hazard of corrupting the mounted volume if you attempt to change it, and a risk of getting incorrect data if the accessed file exists beyond the 2TB limit. There is no good workaround. Splitting the volume is not always possible or convenient.

  

Solution

VM-Ware is planning to address this issue in the next major release.
For more information about this please have a look at: 
 
 
Only possible workaround Symantec can suggest until VM-Ware has fixed this issue are:

Disable GRT option for the backup job of the problem virtual machine.

OR

Run a direct backup of the virtual machine using the Remote Agent instead of the AVVI option.
 
 

 

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