VMware SOFTWARE REPOSITORY FOR WINDOWS 1.1 Guide de l'utilisateur télécharger pdf (Page 25)

Quest NetVault Backup Plug-in

for VMware User’s Guide

Chapter 4:

DEFINING A BACKUP STRATEGY

 Available Backup Methods and Backup Types

 Image-Level Backups

 Available CBT-Based Backup Types

 Available Non-CBT Backup Types

 File-Level Backups

 Available File-Level Backup Types

 Defining a Backup Strategy

 Examples

4.1.0 Available Backup Methods and Backup Types

The Plug-in for VMware supports both image-level and file-level backups of virtual

machines. Image-level backups are operating system neutral and can be

performed for any valid virtual machine; file-level backups are only supported for

Windows Guest OS.

4.1.1 Image-Level Backups

An Image-Level Backup provides a point-in-time image of a virtual machine using

VMware’s snapshot technology. This backup can be used to perform the following

types of recoveries:

 Recover a full virtual machine to a previous known state.

 Restore one or more files to a specified location.

 Restore virtual machine disk and configuration files to a specified location.

Virtual machines hosted on ESX/ESXi 4.0 and later support a feature called

Changed Block Tracking (CBT). CBT allows virtual machines to keep track of

the changed disk sectors. When you enable this feature, a “Change ID” is

assigned to each disk when a snapshot is generated. The Change ID identifies the

state of a virtual disk at a specific point in time. The subsequent snapshots capture

only the blocks that have changed since the last snapshot.

CBT offers the following advantages:

 Allows Incremental and Differential image-level backups of virtual machines.

 Often reduces the backup size of Full image-level backups because only the

used sectors of a virtual disk are backed up.

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VMware SOFTWARE REPOSITORY FOR WINDOWS 1.1 Guide de l'utilisateur Page 25