Microsoft Enterprise Platforms Support: Windows Server Core Team
Data Protection Manger 2007 relies almost completely on a Consistency Check completing; hereafter referred to as a CC. What is a CC? A CC is a method in which DPM determines that a protected dataset is consistent with the Replica data set.
A CC is broken into three parts:
A consistency check is started after the Initial replica is created; hereafter referred to as an IR. When the IR completes, if the data set has not changed, the set is marked as consistent. Well what happens if the data changes between the time that you start the IR creation and the time that it finishes? The data goes through a CC.
If the data has changed, DPM, via the agents and the Volume filter (DPMFLTR.sys), begins a comparison of the file metadata (file date, file time, etc...) If this does not match, it runs an algorithm against the files and compares the results of the IR and the Protected Data. If they are still different, we invoke a fix-up. The fix-up is a block by block comparison of the IR with the protected dataset.
“So, what do I do if my dataset becomes inconsistent?” you may be asking yourself. Here are a few things to look for:
C:\Program Files\Microsoft DPM\DPM\Volumes\DiffArea\W2K3DC2.contoso.com\Non Vss Datasource Writer\Computer\SystemState\SystemState\chkdsk.exe
Author: Walt Whitman Support Engineer Microsoft Enterprise Platforms Support
Data Protection Manager 2007 prevede un meccanismo di verifica dell'integrità di una Replica (un "backup"