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Introduction

Many Microsoft Windows applications (such as Exchange, MS-SQL, etc.) are crucial, features a daily basis for many companies and organizations. The management of data for these applications poses new challenges for system administrators. Although there is a growing need for more data and more to back up, ready at the same time, the system administrator with the theme of reduction of backup windows, where the application may be made onlineto protect the application data. Another problem is to combat the loss of benefits of the production is, if the backup server is running.

Microsoft Volume Shadow Copy Service (VSS) and SANRAD iSCSI V-Switch as the VSS storage provider can help solve these problems, the system administrator, by:

• Eliminate the need to keep in line the request.

• A rapid response to the growing demand for storage capacity.

• Enabling fast backup and restoreBackup to disk backup performance and discharge of production volumes and servers involved.
This application note describes VSS, how it works, the basic equipment needed to work for VSS with the V-Switch SANRAD to create snapshots, and design options for backup with VSS and SANRAD V-Switch. We use Veritas BackupExec (V10.0) to show us, among the backup with VSS with SANRAD V-Switch. This application note assumes that the user has a basic knowledgeas the use SANRAD V-configuration switch, volume and set the server as hard drives. You should also work with Microsoft iSCSI initiator to connect to Windows 2003 server to the volume of exposed SANRAD iSCSI V-Switch family.

What is VSS?
Microsoft Volume Shadow Copy Service (VSS) provides the backup infrastructure for Windows Server 2003 operating systems, as well as a mechanism for creating consistent point in time of data known as shadow copiesor snapshots.

VSS can generate consistent snapshots, improving coordination between different applications (business, services, file systems, backup), and the storage hardware.
The following steps describe VSS Architecture: Phase 1 Route 1: The client (usually a backup program) for the VSS (running on application servers) to create snapshots of the production, so that the snapshot backup can be done and not on production volume. STAGE 2 Route 2: If the volumes"Belong", an application for a writer VSS (VSS-enabled applications such as Exchange), the form of VSS Writer to prepare the volumes. The writer) is usually the data flash to freeze the hard drive and / or write during the period from the VSS snapshot is the (usually only a few seconds. This ensures consistency of application data, when you need a recovery . If there is no VSS VSS writer then moves to the next stage, but there is no guarantee that the data in a consistentState. STEP 3 path 3: Calls VSS providers to create a snapshot. There are three types of VSS Provider: hardware, software and systems. The system vendor is part of the Windows 2003 operating system, and will be instantaneous and keep them, but only at the operating system. A supplier of hardware is usually a provider of iSCSI storage as SANRAD V-Switch, builds and maintains the snapshots at the storage hardware. VSS select the vendor from a list (first on the list, with the emphasis on hardwareProviders, if available). STEP 4 Path 4: VSS goes back to the VSS writer (if any) and allows the use of frozen / O activity and normal activity. 'S Habit 5 Step 5: Back to the applicant (VSS backup application) and gives him the position of the photographs, so you can start the backup from the snapshot. Habit 6 Step 6: If the backup is complete, inform the principal in turn informed the VSS, the VSS provider to remove the snapshot.
Abstract

The combinedSolution of Microsoft Volume Shadow Copy Service (VSS), known SANRAD V-Switch as the VSS storage and provider of backup, VSS applications (such as Veritas BackupExec V10) allow companies to outsource back-orders for the production environment can access to applications for users, while supporting the data and have a life span of data is observed.

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