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VSS is utilized on the source computer for creating snapshots and the VSS writers are used for performing quiesce/unquiesce of Exchange and SQL data. VSS is also used for creating Recovery Points. For Windows 2000 or Windows XP, snapshots on the source computer during the SmartSync Scan phase are created by QSnap, and the default quiesce method is used for quiescing the applications. Recovery Point snapshots on the destination computer can be created using VSS to create Shadow Copies for the snapshots.
If the source computer has Calypso VSS Provider installed, then the VSS quiesce method is used to perform quiescing the applications. For Exchange and SQL Server's, Calypso VSS Provider is utilized on the source computer to perform an online quiesce/unquiesce, instead of using CDR's default offline quiesce/unquiesce, while a marker is placed in the log file for a Consistent Recovery Point. Online quiesce allows the server to continue to function with no interruption for users. If CDR VSS Provider is not installed then the legacy quiesce method is used for creating a Consistent Recovery Point.
The following is necessary to implement this functionality:
If you have the hardware VSS provider setup as the default snap engine and you want to use Microsoft VSS for creating snapshots on the destination computer, you can use the nUseVSSSoftwareProvider registry key. Note that the CDR services will need to be recycled on the client computer for changes to take affect. |
Before using VSS, review the following information:
VSS is the default snap engine used on a Windows 2003 or higher source computer.
To perform a data protection operation using this Agent a specific Product License must be available in the CommServe® Server.
Review general license requirements included in License Administration. Also, View All Licenses provides step-by-step instructions on how to view the license information.
The VSS Provider for CDR does not require a license.