HP StorageWorks EVA Fast Recovery Solution for Windows Server 2003: Administration Guide - EVA4000, EVA6000, EVA8000 (B9552-96006, July 2005)

22 HP StorageWorks EVA Fast Recovery Solution for Windows Server 2003: Administration Guide
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.
Disk Array
Requestor
(FRS)
Application
(Exchange)
and Writer
Virtual Disk Service
VSS Service
HP HWP