Drive Volume is running out of space due to DPM Filter Log Files getting generated in System Volume Information Folder on that Drive

Description: this is a bug in DPM 2012 SP1 Roll Up 5,that DPM Generates filter log files while we try to backup HyperV Child VHD backup, in order to resolve this issue temporary, we can follow below steps, and for permanent solution we could Upgrade DPM to 2012 R2, or simply wait for the Microsoft Product Team in order to provide hot fix for this bug. 

Clustered Environment:

On all the nodes:

1. Open an elevated command prompt

2. type fltmc unload DpmFilter

On one of the nodes do this:

1. Download PSTools from the following link:

http://download.sysinternals.com/files/PSTools.zip

2. Unzip to a folder.

3. Open up an elevated command prompt. Navigate to the unzipped folder.

4. Type psexec -s cmd           (psexec is sysinternal tool used to run cmd under system account)

5. In the new command prompt (running as system):

Type cd C:\ClusterStorage

for /d %i in (volume*) do del /s "%i\System Volume Information\DpmFilter*"  (* includes DPMFilterBitmap{Guid}, DPMFilterStatus, DPMFilterLog, DPMFilterTrace*)

6. Verify files are deleted by typing “dir /s /b DpmFilter*”

7. Exit

Then load the filter again on all nodes:

8. fltmc load DpmFilter (on all cluster nodes)

Non Clustered Environment:

1. Open an elevated command prompt

2. type fltmc unload DpmFilter

3. Download PSTools from the following link:

http://download.sysinternals.com/files/PSTools.zip

4. Unzip to a folder.

5. Open up an elevated command prompt. Navigate to the unzipped folder.

6. Type psexec -s cmd           (psexec is sysinternal tool used to run cmd under system account)

7. Navvigate to the system volume information folder where dpmfilter files resides.

8. Run following command to delete the files del /s DpmFilter*

9. fltmc load DpmFilter

Special Thanks to Microsoft DPM Engineers !!
_Sam