Hp Application Recovery Manager ntegration guide
HP Application Recovery Manager
software
Integration guide
Part number: N/A
First edition: March 2008
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Contents
Publication history .............................................................. 13
About this guide ................................................................. 15
Intended audience ............................................................................................. 15
Documentation set ............................................................................................. 15
Guides ...................................................................................................... 15
Online help ................................................................................................ 17
Documentation map .................................................................................... 17
Abbreviations ...................................................................................... 17
Map ................................................................................................... 17
Document conventions and symbols ..................................................................... 18
Application Recovery Manager graphical user interface ......................................... 19
General Information ........................................................................................... 20
HP technical support .......................................................................................... 20
Subscription service ........................................................................................... 21
HP websites ...................................................................................................... 21
Documentation feedback .................................................................................... 21
1 Integrating the Application Recovery Manager ZDB integrations
and Microsoft Volume Shadow Copy Service ......................... 23
Overview ......................................................................................................... 23
Zero downtime backup ................................................................................ 26
VSS backup types ....................................................................................... 27
Instant recovery with VSS ............................................................................. 27
Concepts .......................................................................................................... 28
Backup ...................................................................................................... 29
Data consistency .................................................................................. 30
Backup with the EVA hardware provider .................................................. 31
Backup with the XP VSS hardware provider .............................................. 31
Restore ...................................................................................................... 32
Microsoft Exchange Server 2007 writer concepts ............................................ 32
Backup ............................................................................................... 32
Restore ................................................................................................ 33
Integration guide 3
Prerequisites and limitations ................................................................................ 33
Prerequisites ............................................................................................... 33
Limitations .................................................................................................. 34
Configuring the integration ................................................................................. 37
Configuring HP StorageWorks Enterprise Virtual Array ..................................... 38
Prerequisites ........................................................................................ 40
Configuring the Integration .................................................................... 39
Configuring HP StorageWorks Disk Array XP .................................................. 40
Prerequisites ........................................................................................ 40
Limitations ........................................................................................... 40
VSS and VDS provider configuration for backup and instant recovery ................ 41
Configuring the VSS Hardware Provider for EVA ....................................... 41
Configuring the VSS Hardware Provider for Disk Array XP ......................... 42
Microsoft Exchange Server writer specific configuration .................................... 42
Microsoft Exchange Server 2007 configuration in LCR environment ............. 42
Microsoft Exchange Server 2007 configuration in CCR environment ............ 42
Configuration check .................................................................................... 43
Backup ............................................................................................................ 44
Overview ................................................................................................... 44
Replica types ....................................................................................... 45
HP StorageWorks EVA specifics .............................................................. 46
HP StorageWorks Disk Array XP specifics ................................................ 46
Creating backup specifications using GUI ...................................................... 47
VSS specific backup options .................................................................. 54
Microsoft Exchange Server writer backup specifics .................................... 54
Microsoft Exchange Server 2007 writer backup specifics ........................... 56
Scheduling the backup ................................................................................ 58
Running an interactive backup ...................................................................... 59
Restore ............................................................................................................. 60
Overview ................................................................................................... 60
Restore using HP StorageWorks EVA .............................................................. 60
Switch of disks ..................................................................................... 60
Copy of replica data with the source volume retained ............................... 61
Copy of replica data with the source volume not retained .......................... 62
HP StorageWorks EVA considerations ..................................................... 62
Restore Using HP StorageWorks Disk Array XP ................................................ 63
HP StorageWorks Disk Array XP considerations ........................................ 63
Microsoft Exchange Server writer recovery specifics ......................................... 65
Microsoft Exchange Server 2007 recovery specifics .................................. 66
Instant recovery .......................................................................................... 68
Instant recovery procedure ..................................................................... 69
Additional steps after restore of a CCR copy to the original database .......... 78
Troubleshooting ................................................................................................. 78
4
Before you begin ........................................................................................ 78
Checks and verifications .............................................................................. 79
Common problems ...................................................................................... 79
Backup problems ........................................................................................ 80
Restore problems ........................................................................................ 84
2 Application Recovery Manager Oracle integration .............. 87
Introduction ...................................................................................................... 87
Backup and restore types ............................................................................. 88
Integration concepts .......................................................................................... 88
Backup process .......................................................................................... 91
Configuring the integration ................................................................................. 93
Prerequisites ............................................................................................... 93
Limitations .................................................................................................. 94
Before you begin ........................................................................................ 94
Cluster-aware clients .................................................................................... 96
Configuring Oracle users on UNIX ................................................................ 96
Configuring Oracle databases ...................................................................... 97
Using the Application Recovery Manager GUI ......................................... 98
Using the Application Recovery Manager CLI ......................................... 101
What happens after the configuration? ................................................. 103
Checking the configuration ........................................................................ 104
Using the Application Recovery Manager GUI ....................................... 104
Using the Application Recovery Manager CLI ......................................... 104
Checking configuration for instant recovery ............................................ 105
Backup .......................................................................................................... 106
Creating backup templates ......................................................................... 106
Creating backup specifications ................................................................... 106
Examples of pre-exec and post-exec scripts on UNIX ............................... 115
Backing up with third–party backup software ................................................ 116
Starting backup sessions .................................................................................. 116
Considerations ......................................................................................... 116
Scheduling backup specifications ................................................................ 117
Running an interactive backup .................................................................... 118
Starting a backup using the GUI ........................................................... 118
Starting a backup using the CLI ............................................................ 118
Restore ........................................................................................................... 119
Instant recovery and database recovery ....................................................... 119
Instant recovery using the Application Recovery Manager GUI ................. 122
Instant recovery using the Application Recovery Manager CLI .................. 125
Recovery options ...................................................................................... 127
Integration with third–party backup software ................................................. 129
Integration guide 5
Database recovery scenarios ............................................................... 129
Example of an RMAN recovery script .................................................... 131
Monitoring sessions ......................................................................................... 132
Monitoring current sessions ........................................................................ 133
Viewing previous sessions .......................................................................... 133
Troubleshooting ............................................................................................... 134
Before you begin ...................................................................................... 134
Checks and verifications ............................................................................ 134
Problems .................................................................................................. 136
3 Application Recovery Manager SAP R/3 integration .......... 139
Introduction .................................................................................................... 139
Integration concepts ........................................................................................ 140
ZDB flow ................................................................................................. 141
Application Recovery Manager SAP R/3 configuration file ................................... 143
Setting, retrieving, listing, and deleting Application Recovery Manager SAP R/3
configuration file parameters using the CLI ................................................... 145
Configuring the integration ............................................................................... 148
Prerequisites ............................................................................................. 149
Before you begin ...................................................................................... 149
Cluster-aware clients .................................................................................. 150
Configuring users ...................................................................................... 150
Configuring SQL*Net V2 or Net8 TNS listener ............................................. 152
Checking the connection ............................................................................ 153
Authentication password file ....................................................................... 153
Enabling archived logging ......................................................................... 154
Sharing directories on the application system ................................................ 155
HP-UX application system .................................................................... 156
Windows application system ................................................................ 156
Configuring SAP R/3 databases ................................................................. 157
Before you begin ................................................................................ 157
Using the Application Recovery Manager GUI ....................................... 157
Using the Application Recovery Manager CLI ......................................... 161
Checking the configuration ........................................................................ 163
Using the Application Recovery Manager GUI ....................................... 163
Using the Application Recovery Manager CLI ......................................... 164
Configuring the SAP R/3 parameter file ....................................................... 165
Backup .......................................................................................................... 165
Limitations ................................................................................................ 165
Considerations ........................................................................................ 166
Backing up with third–party backup software ......................................... 166
Creating backup specifications ................................................................... 166
6
Modifying backup specifications ................................................................. 172
Scheduling backup specifications ................................................................ 172
Scheduling example ........................................................................... 172
Starting backup sessions ............................................................................ 173
Backup methods ................................................................................. 173
Using the Application Recovery Manager GUI ....................................... 174
Using the Application Recovery Manager CLI ......................................... 174
Using SAP BR*Tools ........................................................................... 174
Restore ........................................................................................................... 176
Considerations ......................................................................................... 176
Instant recovery ........................................................................................ 176
Considerations ................................................................................... 176
Instant recovery using the Application Recovery Manager GUI ................. 177
Instant recovery using the Application Recovery Manager CLI .................. 183
Localized SAP R/3 objects ......................................................................... 184
Monitoring sessions ......................................................................................... 184
Troubleshooting ............................................................................................... 185
Before you begin ...................................................................................... 185
Verifying the prerequisites (Oracle side) ....................................................... 185
Verifying the prerequisites (SAP side) ........................................................... 187
Verifying the configuration ......................................................................... 188
Verifying the backup configuration .............................................................. 189
Configuration and backup problems ............................................................ 189
Restore problems ...................................................................................... 191
A Appendix ..................................................................... 193
In this appendix .............................................................................................. 193
Reconfiguring an Oracle instance for instant recovery .......................................... 193
Examples for moving the control files and redo logs to different locations ........ 195
ZDB integrations omnirc variables ..................................................................... 197
Glossary ......................................................................... 201
Index .............................................................................. 225
Integration guide 7
Figures
3
8
9
11
Application Recovery Manager graphical user interface ....................... 201
Actors of the traditional backup model ............................................... 252
Actors of the Application Recovery Manager VSS integration backup
model ............................................................................................ 26
Local VSS backup ............................................................................ 304
Transportable VSS backup ................................................................ 305
Selecting VSS transportable backup ................................................... 486
VSS transportable backup options ...................................................... 517
Selecting backup objects (Exchange Server 2007 LCR copy and SQL
writer) ............................................................................................ 52
Additional options for Microsoft Exchange Server 2007 in CCR
environment .................................................................................... 53
Selecting Microsoft Exchange Server 2003 storage groups ................... 5610
Selecting a replicated Microsoft Exchange Server 2007 storage
group ............................................................................................ 57
Scheduling a backup ....................................................................... 5912
Selecting Exchange Server 2003 writers components for instant
13
recovery ......................................................................................... 70
Selecting Exchange Server 2007 writers components for instant recovery
14
to a different location ....................................................................... 71
Restore to different location options (Exchange Server 2007 Writer) ....... 7415
Selecting instant recovery options (EVA integration) .............................. 7616
Selecting instant recovery options (XP integration) ................................ 7717
Error reported by registry .................................................................. 8318
Oracle integration concept ............................................................... 9019
Oracle integration backup flow ......................................................... 9120
8
Finding the Oracle user .................................................................... 9621
Configuring Oracle - General (Windows) ........................................... 9922
Configuring Oracle - General (UNIX) ................................................. 9923
Configuring Oracle - Primary .......................................................... 10024
Configuring Oracle - Options .......................................................... 10125
XP backup options ......................................................................... 10826
EVA backup options ....................................................................... 10927
Specifying an Oracle Server system (Windows) ................................. 11028
Specifying an Oracle Server system (UNIX) ....................................... 11129
Selecting backup objects ................................................................ 11230
Backup offline option ..................................................................... 11331
Saving the backup specification ....................................................... 11432
Scheduling backups ....................................................................... 11833
Taking the Oracle resource group offline .......................................... 12134
Checking properties ....................................................................... 12135
Selecting a backup session for restore and selecting EVA options ......... 12336
Selecting a backup session for restore and selecting Disk Array XP
37
options ......................................................................................... 124
Oracle recovery options ................................................................. 12538
SAP R/3 integration architecture ...................................................... 14139
SAP R/3 ZDB session flow ............................................................. 14240
Specifying an SAP R/3 system and Oracle instance ........................... 15941
Configuring an SAP R/3 database — application client ..................... 16042
Configuring an SAP R/3 database — backup client ........................... 16143
Checking the SAP R/3 configuration ................................................ 16444
EVA backup options ....................................................................... 16845
XP backup options ......................................................................... 16946
Selecting backup objects ................................................................ 17047
Application specific options ........................................................... 17148
Integration guide 9
Scheduling backups ....................................................................... 17349
SAP R/3 source options — EVA ...................................................... 17850
SAP R/3 source options — XP ......................................................... 17951
SAP R/3 recovery options .............................................................. 18352
Oracle backup and restore concepts when the
53
ZDB_ORA_INCLUDE_CF_OLF variable is set to 1 .............................. 199
10
Tables
Edition history ................................................................................. 131
Documentation map ......................................................................... 172
Document conventions ...................................................................... 183
VSS specific backup options .............................................................. 544
Oracle backup options ................................................................... 1145
Supported disk arrays and array configurations ................................. 1396
SAP parameter file settings ............................................................. 1657
What is backed up ........................................................................ 1658
SAP R/3 backup options ................................................................ 1719
Integration guide 11
12
Publication history
Guide updates may be issued between editions to correct errors or document product
changes. To ensure that you receive updated or new editions, subscribe to the
appropriate product support service. See your HP sales representative for details.
Table 1 Edition history
ProductGuide editionPart number
March 2008N/A
Application Recovery Manager
Release A.06.10
Integration guide 13
Publication history14
About this guide
This guide provides information about:
• Integrating Oracle and Application Recovery Manager
• Integrating SAP R/3 and Application Recovery Manager
• Integrating application and Application Recovery Manager through the VSS
interface
Conceptual information can be found in the online Help.
Intended audience
This guide is intended for backup administrators who want to:
• configure
• back up
• and restore
database applications using Application Recovery Manager.
Documentation set
Other documents and online Help provide related information.
Guides
Application Recovery Manager guides are available in PDF format. Install the PDF
files during the Application Recovery Manager setup procedure by selecting the
English documentation and Help component on Windows or the OB2-DOCS
component on UNIX. Once installed, the guides reside in the AppRM_home\docs
directory on Windows and in the /opt/omni/doc/C/ directory on UNIX.
You can find these documents from the Manuals page of the HP Business Support
Center website:
Integration guide 15
http://www.hp.com/support/manuals
In the Storage section, click Storage Software and then select your product.
• HP Application Recovery Manager software installation and licensing guide
This guide describes how to install the Application Recovery Manager software,
taking into account the operating system and architecture of your environment.
This guide also gives details on how to upgrade Application Recovery Manager,
as well as how to obtain the proper licenses for your environment.
• HP Application Recovery Manager software concepts guide
This guide describes Application Recovery Manager zero downtime backup and
instant recovery concepts and provides background information on how
Application Recovery Manager works in a zero downtime backup environment.
It is intended to be used with the task-oriented HP Application Recovery Manager
software administrator's guide and the HP Application Recovery Manager software
integration guide.
• HP Application Recovery Manager software administrator's guide
This guide describes how to configure and use the integration of Application
Recovery Manager with HP StorageWorks Enterprise Virtual Array and HP
StorageWorks Disk Array XP. It is intended for backup administrators or operators.
It covers the zero downtime backup and instant recovery.
• HP Application Recovery Manager software integration guide
This guide describes how to configure and use Application Recovery Manager
to perform zero downtime backup and instant recovery of Oracle, SAP R/3
applications. The guide also describes how to configure and use Application
Recovery Manager to perform backup and instant recovery using the Microsoft
Volume Shadow Copy Service.
• HP Application Recovery Manager software product announcements, software
notes, and references
This guide gives a description of new features of HP Application Recovery
Manager software A.06.10. It also provides information on supported
configurations (platforms and online database integrations, ZDB), required patches,
and limitations, as well as known problems and workarounds. An updated version
of the supported configurations is available at http://www.hp.com/support/
manuals
• HP Application Recovery Manager software command line interface reference
This guide describes the Application Recovery Manager Command Line Interface
commands, their options and usage as well as providing some basic command
line examples.
About this guide16
Online help
Application Recovery Manager provides context-sensitive (F1) Help and Help Topics
for Windows and UNIX platforms.
You can access the online help from the top-level directory on the installation CD
without installing Application Recovery Manager:
•
Windows
•
UNIX
help system through AppRM_help.htm.
: Unzip AppRM_help.zip and open AppRM_help.chm.
: Unpack the zipped tar file AppRM_help.tar.gz, and access the online
Documentation map
Abbreviations
The guide titles are all preceded by the words “HP Application Recovery Manager
software”.
Map
The following table shows where to find information of different kinds. Shaded squares
are a good place to look first.
Table 2 Documentation map
Command line
interface reference
Online
Help
Getting
started
CLI
Integration
Administrator's
Concepts
Product
Installation
guide
announcements
XXXXInstallation
XXXLicensing
guide
Integration guide 17
guide
guide
XXXXXBackup
XXXConcepts/Techniques
XXXXXInstant recovery
reference
X
Online
Help
Getting
started
CLI
Integration
Administrator's
Concepts
Product
Installation
guide
announcements
XSupport matrices
guide
guide
XXPlanning strategy
guide
XXXXXLimitations
XXXXProcedures/Tasks
XXXXRecommendations
XXXXXRequirements
reference
Supported
configurations
Document conventions and symbols
Table 3 Document conventions
ElementConvention
Cross-reference links and e-mail addressesBlue text: Table 3 on page 18
website addressesBlue, underlined text: http://www.hp.com
Text emphasisItalic text
• File and directory names
• System output
Monospace text
Monospace, italic text
• Code
• Commands, their arguments, and
argument values
• Code variables
• Command variables
X
XXXXTroubleshooting
About this guide18
ElementConvention
Emphasized monospace texttext
CAUTION:
Indicates that failure to follow directions could result in damage to equipment or data.
IMPORTANT:
Provides clarifying information or specific instructions.
NOTE:
Provides additional information.
TIP:
Provides helpful hints and shortcuts.
Application Recovery Manager graphical user interface
Application Recovery Manager provides a cross-platform (Windows and UNIX)
graphical user interface. Refer to the online Help for information about the Application
Recovery Manager graphical user interface.
Integration guide 19
Figure 1 Application Recovery Manager graphical user interface
General Information
General information about Application Recovery Manager can be found at http://
www.hp.com/go/apprm.
HP technical support
For worldwide technical support information, see the HP support website:
http://www.hp.com/support
Before contacting HP, collect the following information:
• Product model names and numbers
• Technical support registration number (if applicable)
• Product serial numbers
• Error messages
• Operating system type and revision level
About this guide20
• Detailed questions
Subscription service
HP recommends that you register your product at the Subscriber's Choice for Business
website:
http://www.hp.com/go/e-updates
After registering, you will receive e-mail notification of product enhancements, new
driver versions, firmware updates, and other product resources.
HP websites
For additional information, see the following HP websites:
• http://www.hp.com
• http://www.hp.com/go/software
• http://www.hp.com/service_locator
• http://www.hp.com/support/manuals
• http://www.hp.com/support/downloads
Documentation feedback
HP welcomes your feedback.
To make comments and suggestions about product documentation, please send a
message to AppRM.DocFeedback@hp.com. All submissions become the property of
HP.
Integration guide 21
About this guide22
1 Integrating the Application Recovery Manager ZDB integrations and Microsoft Volume Shadow Copy Service
Overview
A traditional backup process is based on the direct communication between the
backup application and the application whose data is backed up. This backup
method requires from the backup application an individual interface for each
application it backs up.
The number of applications on the market is constantly increasing. The necessity of
handling application specific features can cause difficulties in backup, restore, and
storage activities. An effective solution to this problem is introducing a coordinator
among the actors of the backup and restore process.
Volume Shadow Copy Service
Volume Shadow Copy Service (VSS) is a software service introduced by Microsoft on
Windows operating systems. This service collaborates with the backup application,
applications to be backed up, shadow copy providers, and the operating system
kernel to implement the management of volume shadow copies and shadow copy
sets.
Application Recovery Manager supports the integration with VSS.
The Application Recovery Manager Volume Shadow Copy integration provides a
unified communication interface that can coordinate backup and restore of an
application regardless of their specific features. With this approach, a backup
application does not need to handle each application to be backed up specifically.
Integration guide 23
However, the production application as well as the backup application must conform
to the VSS specification.
Figure 2 on page 25 and Figure 3 on page 26 show the differences between the
traditional backup model and the model with the Application Recovery Manager
Microsoft Volume Shadow Copy integration.
24
Integrating the Application Recovery Manager ZDB integrations and Microsoft Volume
Shadow Copy Service
Figure 2 Actors of the traditional backup model
Integration guide 25
Figure 3 Actors of the Application Recovery Manager VSS integration
backup model
Without using the Volume Shadow Copy Service, Application Recovery Manager
has to communicate with each application to be backed up individually. The
Application Recovery Manager VSS integration introduces a unified backup and
restore interface and provides the coordination among the participants of the backup
and restore process.
Zero downtime backup
Zero downtime backup is a backup approach in which replication techniques are
used to minimize the impact of backup operations on an application system. A replica
of the data to be backed up is created first, and all subsequent backup operations
are performed on the replicated data rather than the original data.
As a backup occurs in the background while the application remains online and
available for use, the impact on your environment during a backup is minimal. The
recovery window is reduced as well by using the instant recovery (IR) functionality,
which enables recovery of vast amount of data in minutes rather than hours. This
26
Integrating the Application Recovery Manager ZDB integrations and Microsoft Volume
Shadow Copy Service
makes ZDB and IR capabilities suitable for high-availability systems and mission-critical
applications.
Application Recovery Manager ZDB and IR techniques utilize snapshot technologies
of disk-based arrays. The following are the basic principles behind ZDB and IR:
• Create, at high speed, a copy of the data to be backed up and then perform
backup operations on the copy, rather than on the original data.
• Restore a backup copy of data, held on the array, to its original location on the
array to facilitate high-speed recovery.
VSS backup types
Application Recovery Manager supports only full backups.
The following backup types are available with the Application Recovery Manager
VSS integration:
• Local VSS backup
The shadow copy is backed up from the application system.
• Transportable backup
Instead of presenting the volume shadow copies to the application system they
are presented to an alternate system thus reducing the impact of post backup
activities, such as consistency checking. It also provides the option to mount the
backup replicas on a backup system.
Instant recovery with VSS
Instant recovery is a process in which a replica, produced by a VSS hardware
provider, is used to restore the contents of the source volumes to their states at the
time at which the replica was created. This process consists of the preparation and
actual recovery of data and, optionally, some post-restore actions that make that
data ready for use.
The Application Recovery Manager internal database (IDB) keeps track of data, such
as, which replicas from which system are kept on a particular disk array. The IDB
provides fast and convenient access to the data to be recovered.
Advanced features of Application Recovery Manager instant recovery:
• Ability to restore on different levels: session or object
• Ability to automatically start post-recovery scripts
Integration guide 27
Instant recovery considerations
• The instant recovery functionality restores data from a replica on the backup
system to the source volumes on the application system. Therefore, using instant
recovery, it is only possible to selectively restore separate writer’s components if
they reside on separate source volumes.
Concepts
The Application Recovery Manager integration with Microsoft Volume Shadow Copy
Service and Virtual Disk Service provides backup and instant recovery functionality
for VSS writers that are certified by Application Recovery Manager.
Refer to the online Help for a general description of ZDB (snapshot backup) and
instant recovery concepts.
For a complete list of supported VSS writers and providers refer to the latest support
matrices at http://www.hp.com/support/manuals.
Benefits of using the integration
Advantages of using the Application Recovery Manager VSS integration are the
following:
• Unified backup interface is provided for all applications that provide a writer.
• Data integrity is provided on application level, because it is provided by the
writers. No interference is needed from the backup application.
VSSBAR agent
The central part of the integration is the VSSBAR agent, which links Application
Recovery Manager with the Microsoft Volume Shadow Copy Service. Application
Recovery Manager Microsoft Volume Shadow Copy integration uses the VSSBAR
agent for automatic browsing of VSS-aware writers, coordinating backup and restore.
VSSBAR agent is responsible for the following actions:
• detecting VSS writers
• examining and analyzing Writer Metadata Document (WMD)
• requesting shadow copy creation
28
Writer Metadata Document (WMD) is metadata provided by each writer. Writers
identify themselves by the metadata and instruct the backup application what to
back up and how to restore the data. Thus, Application Recovery Manager follows
the requirements provided by the writer when selecting the volumes to be backed
up and the restore method.
Integrating the Application Recovery Manager ZDB integrations and Microsoft Volume
Shadow Copy Service
Backup
• coordinating restore session start
• requesting the instant recovery
During the Application Recovery Manager VSS integration backup, Application
Recovery Manager does not interact directly with each writer, but through the VSS
interface. It uses the VSSBAR agent to coordinate the backup process. The consistency
of data is a responsibility of the VSS writer and not dependent on Application
Recovery Manager functionality. The backup process of the VSS writers consists of
the following phases:
1. When you select writers and components you want to back up and start a VSS
integration backup, Application Recovery Manager communicates with the
Volume Shadow Copy Service (backup coordinator) to notify that the backup is
about to start.
2. The coordinator identifies all writers that support the VSS feature and passes the
list of available writers and their characteristics (Writer Metadata Document)
back to Application Recovery Manager.
3. Application Recovery Manager examines Writer Metadata and identifies the
volumes that contain the data to be backed up. Then the VSS informs available
writers about selected components.
4. Application Recovery Manager prepares a list of volumes (shadow copy set)
that must be put into consistent state, and passes the list back to the coordinator
for preparing a shadow copy.
5. The VSSBAR agent notifies the writers about the shadow copy creation. The VSS
mechanism ensures that there are no writes on the volume while the shadow
copy is being created.
6. When the writers are fully prepared for the consistent shadow copy backup, the
VSSBAR agent passes shadow copy creation requests to VSS.
7. After the shadow copy set is created, the VSSBAR agent coordinates the VDS
agent to gather information on the created replica that is needed for instant
recovery.
8. After the information is stored to the internal database, the replicas are
unpresented from the backup system. All replicas are set to read-only and are
unpresented from all systems to protect the backed up data, unless you specify
to mount the replica on the backup system.
Integration guide 29
Figure 4 Local VSS backup
Figure 5 Transportable VSS backup
30
Integrating the Application Recovery Manager ZDB integrations and Microsoft Volume
Shadow Copy Service
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