The DFS VSS Writer (The Component of VSS that controls the quiescing of data related to DFS) works differently than other VSS writers.
DFS has numerous components that work together to allow replication between machines, to keep revisions, and keep a list of open and accessible files. In order to facilitate these processes, the DFS VSS Writer pauses the VSS processes so that the components can perform the needed actions to:
These processes may take a long time to complete and during that time VSS keeps the system in a frozen state to prevent changes on disk (quiescing data). While the DFS VSS writer is working the DFS replications are paused and incoming data is cached in memory. If the DFS processes do not complete within the timeout window they are abandoned by VSS to prevent data loss and ensure proper function of DFS. This results in DFS warnings and errors related to replication.
Errors and warnings that occur on systems using DFS during backups can be safely ignored so long as all DFS replication remains healthy when backups are not in process. DFS warnings and errors should only occur during the short time period in which VSS is actively creating a shadow copy on the system running DFS. It is possible to avoid errors and warnings caused by backups completely by disabling the DFS VSS writer, however, this results in the DFS data not being properly quiesced and could result in the backup being inconsistent or possibly unusable.
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