Volume Shadow Copy (VSS) and Automated System Recovery (ASR) doc updates

Volume Shadow Copy (VSS) and Automated System Recovery (ASR) doc updates

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This is a summary of recent additions and revisions to the VSS and ASR documentation on MSDN and TechNet.

1. The following new API elements have been documented:

a. IVssComponentEx2 interface (


b. IVssCreateExpressWriterMetadata interface (http://msdn.microsoft.com/en-us/library/dd765211.aspx)

c. IVssExpressWriter interface (http://msdn.microsoft.com/en-us/library/dd405596.aspx)

d. CVssWriterEx2 class (http://msdn.microsoft.com/en-us/library/dd405545.aspx)

e. VSS_RECOVERY_OPTIONS enumeration (http://msdn.microsoft.com/en-us/library/dd433620.aspx)

f. CreateVssExpressWriter function (http://msdn.microsoft.com/en-us/library/dd405544.aspx)

g. IVssHardwareSnapshotProviderEx::ResyncLuns method (http://msdn.microsoft.com/en-us/library/bb427429.aspx)

2. A new topic, "Using Tracing Tools with VSS" (http://msdn.microsoft.com/en-us/library/dd765233.aspx), was added.

3. The Remarks sections for the following methods have been completely rewritten:

a. IVssBackupComponents::EnableWriterClasses (


b. IVssBackupComponents::DisableWriterClasses (http://msdn.microsoft.com/en-us/library/aa382655.aspx)

c. IVssBackupComponents::DisableWriterInstances (http://msdn.microsoft.com/en-us/library/aa382657.aspx)

4. The in-box VSS writer lists have been expanded. These will eventually be consolidated into a single master list.

a. New In-Box VSS Writers for Windows Server 2008 R2 and Windows 7 (


b. New In-Box VSS Writers for Windows Server 2008 and Windows Vista SP1 (http://msdn.microsoft.com/en-us/library/ee517247.aspx)

c. In-Box VSS Writers (http://msdn.microsoft.com/en-us/library/bb968827.aspx)

5. The MaxShadowCopies and MinDiffAreaFileSize registry values have been added to "Registry Keys and Values for Backup and Restore" (http://msdn.microsoft.com/en-us/library/bb891959.aspx)

6. The sequence of requester and writer actions in "Overview of the Backup Discovery Phase" (http://msdn.microsoft.com/en-us/library/aa384593.aspx) has been revised.

7. The Events and Errors troubleshooting documentation for VSS (also called the VSS Health Model) (http://technet.microsoft.com/en-us/library/cc734243.aspx) has been updated for Windows Server 2008 R2.

8. The VShadow command has new command-line options for reverting to a previous shadow copy and for resynchronizing LUNs: http://msdn.microsoft.com/en-us/library/bb530725.aspx

9. The registry value information in "Security Considerations for Writers" (http://msdn.microsoft.com/en-us/library/aa384605.aspx) and "Security Considerations for Requesters" (http://msdn.microsoft.com/en-us/library/aa384604.aspx) has been updated.

10. A code example was added to "Using VSS Automated System Recovery for Disaster Recovery" (http://msdn.microsoft.com/en-us/library/aa384630.aspx)

- Diane

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  • Please give our kudos to Diane.  Glad to see someone keeping the documentation up-to-date and organized for better usage.