This fix delivers stability for DM backups on Hyper-V configuratons on CSV.
Important Update on System Center 2012 SP1 Data Protection Manager (DPM) Update Rollup 3.6 – Issues with VM protection and fixes
Issue #1: DPM has express full technology where DPM tracks the changes via DPM filter driver and the changed block information are tracked as bitmap and is stored in bitmap files. In some scenarios, DPM bitmap files are becoming very big leading to higher CSV volume consumption. This issue is fixed in DPM filter and effects only VM protection scenarios. This fix is done on the DPM filter driver running on the production server.
Please note: It is advised to apply this update only if you are backing up Hyper-V VMs. This upgrade will lead to CC on all data sources that are effected by this particular DPM servers.