The file data synchronization process, See also – Dell PowerVault DP600 User Manual

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The File Data Synchronization Process

In DPM 2007, for a file volume or share on a server, the protection agent uses a volume filter and

the change journal to determine which files have changed and then performs a checksum

procedure for these files to synchronize only the changed blocks. During synchronization, these

changes are transferred to the DPM server and then applied to the replica to synchronize the

replica with the data source. The following figure illustrates the file synchronization process.

File Synchronization Process

If a replica becomes inconsistent with its data source, DPM generates an alert that specifies

which computer and which data sources are affected. To resolve the problem, the administrator

repairs the replica by initiating a synchronization with consistency check, also known as simply

a consistency check, on the replica. During a consistency check, DPM performs a block-by-block

verification and repairs the replica to bring it back into consistency with the data source.

You can schedule a daily consistency check for protection groups or initiate a consistency check

manually.

At regular intervals that you can configure, DPM creates a recovery point for the protection group

member. A recovery point is a version of the data from which data can be recovered. For files, a

recovery point consists of a shadow copy of the replica, which is created by using the Volume

Shadow Copy Service (VSS) functionality of the operating system on the DPM server.