VSS process flow
The following steps show the VSS process flow:
1.A Requestor application (FRS) initiates a Volume Shadow Copy.
2.FRS requests that the Volume Shadow Copy service create a shadow copy of a selected set of storage groups.
3.VSS tells the Writer and application to prepare for a shadow copy. The Writer reports which LUNs to copy, flushes cache, and holds I/O.
4.VSS tells the disk array through HP HWP to create a shadow copy of the production storage volume.
5.VSS releases the writer application to resume normal operations.
6.The Requestor (FRS) presents the recovery LUNs to the recovery server using VSS, waits for normalization, runs integrity checking, verifies backup integrity, truncates logs upon success, and tells the writer that the backup was successful.
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Virtual Disk Service |
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VSS Service |
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Disk Array |
22HP StorageWorks EVA Fast Recovery Solution for Windows Server 2003: Administration Guide