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Summary

The Windows System Partition has insufficient disk space available to run the backup

 

Step By Step

Backups of a Windows client may fail if the System Reserve Partition has insufficient space available to run the backup.

Your DPX Backup Job Report may display the following error messages:
  • VOL[\\?\Volume{.....}\]: Insufficient disk space available to run the backup
  • Available free space[...]M, Need [...]M free space
  • Failed to perform the pre snapshot setting for volume(\\?\Volume{.......}\); rc (-302)
  • MsSnapShot::add_physical_disks_to_backup:add_to_snapshot_set error(\\?\Volume{......}\) (23075)

In this case, please first verify that the Volume Serial Number displayed is in fact the System Reserved Partition by opening a Windows Command Prompt on the Client that has the failure, then issue the "mountvol" command. 

To reclaim space on the System Reserve Partition, first delete the Windows USN Journal and then reset the DPX Change Journal on this Partition. Do the following:

1) Temporarily assign a drive letter to the System Reserved partition from "Disk Management."
2) Open an elevated command prompt and run: fsutil usn deletejournal /N /D X: where "X" is the assigned drive letter of the System Reserved Partition.
3) Remove the drive letter to the System Reserved Partition (which should remain without any assigned drive letter).

Then reset the DPX Change Journal.  Do the following: 

1) Open a DPX command prompt in Administrator mode (right click > run as administrator) 
2) Type: bexsnapmgr.bat 
3) Select Change Journal configuration 
4) Select the System Reserved Partition ID and press Disable 

You may now close the Command Prompt and re-run your Backup job. There should now be sufficient space available to run the backup of this partition. 

 

Comments (1)
  • F.Neumann
    Wed, 24 Mar 2021 07:42:57 GMT
    Step 2 results in "Error:  The volume change journal is not active." - is there another way to fix this issue?