vSphere Data Protection 6.1安装与管理全面指南

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vSphere Data Protection Administration Guide

16 VMware, Inc.

Image Level Backup and Restore

vSphere Data Protection creates image level backups, which are integrated with the vStorage API for Data

Protection, a feature set within vSphere to offload the backup processing overhead from the virtual machine

to the VDP appliance. The VDP appliance communicates with the vCenter server to make a snapshot of a

virtual machine’s .vmdk files. Deduplication takes place within the appliance by using a patented

variable-length deduplication technology.

To support the large scale and continually expanding size of many VMware environments, each VDP

appliance can simultaneously back up to 8 virtual machines if the internal proxy is used, or back up to 24

virtual machines if the maximum number of 8 external proxies are deployed with the VDP appliance.

To increase the efficiency of image level backups, VDP utilizes the Changed Block Tracking (CBT) feature,

which greatly reduces the backup time of a given virtual machine image and provides the ability to process a

large number of virtual machines within a particular backup window.

By leveraging CBT during restores, VDP offers fast and efficient recoveries of virtual machines to their original

location. During a restore process, VDP uses CBT to determine which blocks have changed since the last

backup. The use of CBT reduces data transfer within the vSphere environment during a recovery operation

and more importantly reduces the recovery time.

Additionally, VDP automatically evaluates the workload between both restore methods (full image restore or

a recovery leveraging CBT) and performs the method resulting in the fastest restore time. This is useful in

scenarios where the change rate since the last backup in a virtual machine being restored is very high and the

overhead of a CBT analysis operation would be more costly than a direct full-image recovery. VDP determines

which method results in the fastest image recovery times for virtual machines in the environment.

VDP supports backups of a vCenter server appliance (VCSA) by using an embedded Platform Service

Controller.

To perform the backups of a vCenter server and a VCSA by using an external Platform Services Controller,

perform the steps that http://kb.vmware.com/kb/2110294 describes.

Single VMDK Backup and Restore

A full image backup job includes all disks in the entire virtual machine (VM) in a single image backup.

Individual disk backup jobs allow you to select only the disks you need. An image level backup of a VM with

unsupported disk types does not include the unsupported disk types because of snapshot limitations.

When you restore a VM, the VDP appliance restores the VM configuration file (.vmx), which results in the

creation of all VMDKs from the original VM. If any of the original VMDKs were not backed up, the restore

process creates them as provisional VMDKs. The VM may not be fully functional in this case. The protected

VMDKs, however, can be accessed from the restore.

See “Creating a Backup Job on Individual Disks” on page 115 for instructions on backing up individual disks.

Guest-level Backup and Restore

VDP supports guest-level backups for Microsoft SQL Servers, Exchange Servers, and Share Point Servers. With

guest-level backups, client agents (VMware VDP for SQL Server Client, VMware VDP for Exchange Server

Client, or VMware VDP for SharePoint Server Client) are installed on the SQL Server, Exchange Server, or

SharePoint Server in the same manner that backup agents are typically installed on physical servers.

The advantages of VMware guest-level backups are:

 Provides additional application support for Microsoft SQL Server, Microsoft Exchange Server, or

SharePoint Server inside the virtual machines

 Support for backing up and restoring entire Microsoft SQL Server, Microsoft Exchange Server, or

SharePoint Servers or selected databases

 Identical backup methods for physical and virtual machines

VMware, Inc. 17

Chapter 1 Understanding vSphere Data Protection

See “VDP Application Support” on page 159 for additional information on guest-level backup and restore.

Replication

Replication enables you to avoid data loss if the source VDP appliance fails because copies of the backups are

available on the destination target.

Replication jobs determine which backups are replicated, and when and to where the backups are replicated.

With scheduled or ad hoc replication jobs for clients that have no restore points, only the client is replicated

on the destination server. Backups created with VDP 6.0 or later can be replicated to another VDP appliance,

to an EMC Avamar server, or to a Data Domain system. If the target VDP appliance is 5.8 or earlier, then the

target must be VDP Advanced or Replication Target Identity.

See Chapter 15, “Replication,” on page 137 for additional information on Replication.

File Level Recovery

File Level Recovery (FLR) allows local administrators of protected virtual machines to browse and mount

backups for the local machine. From these mounted backups, the administrator can then restore individual

files. FLR is accomplished by using the VDP Restore Client.

See Chapter 16, “Using File Level Restore,” on page 151 for additional information on FLR.

Customer Experience Improvement Program

The Customer Experience Improvement Program is an option that enables you to send encrypted

configuration and usage information about the VDP environment to VMware servers for analysis. The

purpose of the Customer Experience Improvement Program is to help VDP improve the quality, reliability, and

functionality of the VDP product. The Customer Experience Improvement Program is not enabled by default.

During installation, you can enable the Customer Experience Improvement Program from the Product

Improvement page in the VDP Configure Utility. You can also enable or disable this option any time after the

installation of VDP from the post-installation UI. Refer to “Configuring the Customer Experience

Improvement Program” on page 52 for more information.

VDP Architecture

VDP can be deployed to any storage supported by vSphere. Supported storage includes VMFS, NFS, and

VSAN datastores. Management of VDP is performed by using the vSphere web client.

Backup data is deduplicated and stored in the .vmdk files that make up the VDP virtual appliance or a

supported Data Domain appliance.

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