WHIT E
PAPER
P PA P E R
Symantec Backup Exec Quick Recovery & Off-Host Backup Solutions
Symantec Backup Exec Quick Recovery & Off-Host Backup Solutions
for Microsoft Exchange Server 2003 & Microsoft SQL Server
1
Introduction ....................................................................................................................................................................................................1
Solution Components.....................................................................................................................................................................................1
VERITAS Backup Exec Advanced Disk-based Backup Option.......................................................................................................1
VERITAS Storage Foundation for Windows.......................................................................................................................................1
VERITAS FlashSnap Option .................................................................................................................................................................1
Customer Advantages ....................................................................................................................................................................................2
Volume Shadow Copy Service.......................................................................................................................................................................2
Quick Recovery...............................................................................................................................................................................................3
Off-Host Backup ............................................................................................................................................................................................4
Deployment Information ...............................................................................................................................................................................5
Solution Diagram......................................................................................................................................................................................5
Software Components..............................................................................................................................................................................6
Exchange Server.....................................................................................................................................................................................6
Backup Exec Media Server....................................................................................................................................................................6
Deployment Best Practices ......................................................................................................................................................................6
For More Information ...................................................................................................................................................................................7
Copyright © 2005 Symantec Corporation. All rights reserved. Symantec, the Symantec Logo, VERITAS, Backup Exec, the VERITAS Logo and all other VERITAS product names and
slogans are trademarks or registered trademarks of Symantec Corporation or its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners.
INTRODUCTION
Microsoft Exchange and SQL servers are mission critical components in today’s business environment. IT administrators
need to ensure access to data and email communications for employees, customers and partners are maintained 24
hours a day, 7 days a week. The greater reliance on all forms of electronic communication raises the potential of quickly
escalating into a business disaster when any event causes mission critical email and database data to become
unavailable.
The Symantec Quick Recovery & Off-Host Backup Solutions are the industry’s first complete solution for customers who
want Quick Recovery and Off-Host Backup support for Microsoft Exchange Server 2003 and Microsoft SQL Server. This
solution combines the Symantec Backup Exec Advanced Disk-Based Backup Option with VERITAS Storage
Foundation for Windows and VERITAS FlashSnap to create a solution that eliminates backup windows, reduces the
performance load on application servers and quickly brings applications back online after data corruption issues.
This solution leverages the Volume Shadow Copy Service (VSS) capabilities built into Microsoft Exchange Server 2003,
Microsoft SQL Server and Microsoft Windows Server 2003. The solution is hardware independent and supports most
leading fibre channel and iSCSI SAN arrays.
SOLUTION COMPONENTS
The Symantec Quick Recovery & Off-Host Backup Solution includes the Symantec Backup Exec Advanced Disk-Based
Backup Option, VERITAS Storage Foundation for Windows and the VERITAS FlashSnap Option.
Customer prerequisites include: Microsoft Windows Server 2003, Microsoft Exchange Server 2003 SP1 or Microsoft
SQL Server 2000 SP3, a SAN or shared SCSI environment, Symantec Backup Exec Media Server and the appropriate
Backup Exec Agents for Exchange or SQL, which include a remote agent for Windows Servers.
SYMANTEC BACKUP EXEC ADVANCED DISK-BASED BACKUP OPTION
Off-Host backups virtually eliminate backup windows and network bandwidth requirements, and do not impact the
production server. Additionally, Off-Host backups allow for quick client restore from a single backup image to reduce the
number of tapes and eliminate the need to restore from incremental backups. The Off-Host backup feature enables
better backup performance and eliminates backup processing overhead on the protected application server by
processing the backup operation on a Backup Exec media server instead of on the application server.
VERITAS STORAGE FOUNDATION FOR WINDOWS
VERITAS Storage Foundation for Windows dramatically increases the amount of time users have access to data by
reducing both planned and unplanned downtime. Traditional disk storage management is a labor intensive process,
often requiring systems to be taken offline for hours at a time, disabling users’ access to data and requiring tedious,
manual intervention by system administrators. Storage Foundation overcomes the obstacles of traditional disk
management by providing easy-to-use online disk storage management for mission-critical, enterprise Windows
environments. Storage Foundation enables high availability of data and optimized storage I/O performance, and protects
current storage investments while also allowing freedom of choice for future storage hardware investments.
VERITAS FLASHSNAP OPTION
VERITAS FlashSnap allows you to create independently addressable, point-in-time snapshots that are copies or mirrors
of the volumes on your server. These snapshots can be easily moved to another server for backup or other purposes
such as testing or data mining. These activities can be performed without affecting the normal functions of missioncritical servers.
The snapshots may also be kept on the same server for quick recovery from data corruption issues. You may choose to
recover to the point-in-time of the last snapshot or to the point-of-failure using roll forward recovery. Even when a
FlashSnap operation is performed on the same server, its efficient mirror break off and join processes are much faster
and takes less CPU cycles than other mirror break off procedures that use ordinary mirroring.
Copyright © 2005 Symantec Corporation. All rights reserved. Symantec, the Symantec Logo, VERITAS, Backup Exec, the VERITAS Logo and all other VERITAS product names and
slogans are trademarks or registered trademarks of Symantec Corporation or its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners.
FlashSnap supports Windows Server 2003 Volume Shadow Copy Service (VSS) as a VSS Provider for Microsoft
Exchange Server 2003 and Microsoft SQL Server 2000 environments. By leveraging VSS, which is Microsoft's approved
and supported technology for taking snapshots, VERITAS Storage Foundation for Windows FlashSnap Option can
create exact point-in-time copies of data to be used instantly for quick recovery, off-host backup and other processing.
CUSTOMER ADVANTAGES
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Easy to Buy
o One Part Number Includes All the Software Required
Leverages Microsoft Volume Shadow Copy Services (VSS) Architecture
o Microsoft Windows Server 2003
o Microsoft Exchange Server 2003
o Microsoft SQL Server 2000
Heterogeneous Array Support – Works with most leading storage arrays
o Supports Most Leading Fibre Channel SAN Arrays
o Supports Most Leading iSCSI SAN Arrays
Quick Recovery
o Point-in-Time Snapshots
o Point-of-Failure or Roll-Forward Recovery
o Quick Recovery in Minutes versus Hours
Off-Host Backup
o Minimal or No Backup Window
o No Performance Load on Application Server
o Backup Server can backup at FC Speeds
o No LAN Performance Impact
VOLUME SHADOW COPY SERVICE
With the release of Windows Server 2003, Microsoft introduced a new storage management technology called Volume
Shadow Copy Services (VSS). VSS offers a framework for applications and storage to perform coordinated data
snapshots. Because the business application (VSS writer) storage (VSS provider) and backup application (VSS
requestor) are tightly coordinated, Microsoft is able to coordinate the snapshot quiesce point while guaranteeing data
integrity.
The Shadow Copy technology is the basis of the backup/restore infrastructure in Windows Server 2003. VSS enabled
backup applications can utilize VSS to achieve consistent online backups of data and files that are open during the
backup. This is accomplished by VSS facilitating communication between the following VSS components:
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VSS Requesters – Backup or Management applications that invoke the Volume Shadow Copy Service to initiate
basic VSS functions such as creating, importing, or deleting snapshots. Examples: Backup Exec, NetBackup,
FlashSnap.
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VSS Writers – Application-specific software modules that ensure the consistency and integrity of an application’s
data when a snapshot is taken. With VSS, the responsibility for data consistency shifts from the requestor
application to the production application. The advantage of this is that application developers, who are most
knowledgeable about their application, can ensure maximum effectiveness of the snapshot process through
development of their own writers. Examples: Exchange Server 2003 Writer, SQL Server 2005 Writer
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VSS Providers – Expose the mechanism for hardware or software-based snapshots. Hardware vendors are
responsible for writing providers for their storage arrays. Software vendors, such as Symantec, also write snapshot
providers. Windows Server 2003 includes a system software provider with snapshot (shadow copy) functionality,
and supports multiple hardware and software providers, which can be used in combination to solve many different
Copyright © 2005 Symantec Corporation. All rights reserved. Symantec, the Symantec Logo, VERITAS, Backup Exec, the VERITAS Logo and all other VERITAS product names and
slogans are trademarks or registered trademarks of Symantec Corporation or its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners.
scenarios. On its own, VSS follows a default hierarchy when selecting a provider during the snapshot creation:
hardware provider first, followed by software provider, then the system software provider (Copy-on-Write (COW)
provider). The requestor can, however, override this hierarchy and specify the provider to use.
QUICK RECOVERY
Usually you conduct your backups or incremental backups nightly. In the example below, if your business is running all
day and there is a failure at 13:00, you have to go back and recover from media – this can be a very lengthy and tedious
process that causes your organization substantial downtime by the time you finally recover. Restoring from backup takes
hours at best and only provides the ability to restore to the point in time of the last backup. Transactions that occur after
that point are lost.
Symantec provides administrators with the ability to recover in minutes. In this example, you have taken a snapshot.
Once created the snapshot remains on the Exchange server where it’s available to enable quick restoration; as stated
Copyright © 2005 Symantec Corporation. All rights reserved. Symantec, the Symantec Logo, VERITAS, Backup Exec, the VERITAS Logo and all other VERITAS product names and
slogans are trademarks or registered trademarks of Symantec Corporation or its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners.
earlier - no data transfer from disk or tape is required. The Exchange or SQL databases can be mounted immediately
using the snapshot volume.
In the example above, if you have a failure at 13:00, all you need to do is recover from the snapshot to achieve a pointin-time recovery. If you wish to achieve a point-of-failure recovery, replay the transaction logs, and you are back in
production. This is an ideal way to painlessly recover from logical errors and increases your business’ ability to be
resilient to unplanned downtime, and you are up and running dramatically faster than with the standard data recovery
techniques.
OFF-HOST BACKUP
Today’s IT administrators are faced with the daunting task of ensuring business continuity by protecting their company’s
data. Backup operations are becoming increasingly complex due to mixed environments, as well as the need for
increased application availability that requires those applications to be backed up even while in use. Three key
challenges facing IT administrators during backup operations are:
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Incomplete backups. According to a survey conducted by Strategic Research Corporation, open files cause 97%
of incomplete backups. One measurement of a quality backup is that all files are backed up completely, enabling a
point-in-time recovery. In the event that a recovery is needed, the ability to recover all files at the point in time
ensures data consistency.
Minimal or no backup window. Today’s fast-paced, competitive business environment requires networks to be
operational around the clock. Web sites, e-mail systems, and other databases must be available 24 hours a day,
365 days a year. This means that it is unacceptable to bring down a system or the entire network to perform backup
operations.
Application Performance and Availability. Traditional backup processing degrades the performance of other
applications running on the server, and frequently requires a dedicated window of time when the system is
unavailable to end-users. Off-Host technology allows the backup to run against a copy of the production data on a
different server. This removes the performance overhead of backup processing from the production server and
eliminates the need for a backup window.
Traditional Client Backup
using Backup Exec and
the Exchange Agent
Off-Host Backup using Backup Exec
Advanced Disk-Based Backup Option
and SFW Flashsnap
Client
Client
LAN
LAN
Media
Server
CPU & I/O
Impact
Media
Server
CPU & I/O
Impact
VERITAS FlashSnap Mirror
Creating snapshots for Off-Host backup requires minimal overhead and does not interfere with normal system
operations. As a result, administrators can schedule snapshots frequently, minimizing potential data loss during a
disaster. Off-Host backups are a particularly good solution for organizations with stringent high availability requirements
and large amounts of data.
Copyright © 2005 Symantec Corporation. All rights reserved. Symantec, the Symantec Logo, VERITAS, Backup Exec, the VERITAS Logo and all other VERITAS product names and
slogans are trademarks or registered trademarks of Symantec Corporation or its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners.
LAN
Backup
Server
Exchange
Server 2003
Exchange data flow
Mirror mounted on backup server
Backup data flow
Primary
Storage
Mirror
Tape Library
SAN
Disk Array
DEPLOYMENT INFORMATION
SOLUTION DIAGRAM
Symantec Backup Exec Quick Recovery
& Off-Host Backup Solution
Backup Exec Media Server
Symantec Backup Exec 10.0 or later
Symantec Advanced Disk Based Backup Option
Symantec Backup Exec Exchange Server Agent
VERITAS Storage Foundation 4.3 for Windows
Shared SAN Storage
Hardware Arrays or JBODs
Exchange Server
Microsoft Windows Server 2003
Microsoft Exchange Server 2003 with SP1
Symantec Backup Exec Remote Agent for Windows
VERITAS Storage Foundation 4.3 for Windows
VERITAS FlashSnap Option
Tape Library
Copyright © 2005 Symantec Corporation. All rights reserved. Symantec, the Symantec Logo, VERITAS, Backup Exec, the VERITAS Logo and all other VERITAS product names and
slogans are trademarks or registered trademarks of Symantec Corporation or its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners.
SOFTWARE COMPONENTS
Exchange Server
• Microsoft Windows Server 2003, Standard, Enterprise or Datacenter Edition
• Microsoft Exchange Server 2003, Service Pack 1
• Symantec Backup Exec Remote Agent for Windows
• VERITAS Storage Foundations for Windows
• VERITAS FlashSnap Option
Backup Exec Media Server
• Symantec Backup Exec for Windows Servers
• Symantec Backup Exec Agent for Microsoft Exchange Server
• Symantec Backup Exec Advanced Disk-based Backup Option
• VERITAS Storage Foundations for Windows
DEPLOYMENT BEST PRACTICES
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Fibre Channel and iSCSI SANs are both supported with this solution
The system and boot volumes should reside on a separate disk (Harddisk0).
Microsoft Exchange Server supports snapshots at the Exchange Storage Group level only using VSS
The hardware for your snapshot solution should include sufficient storage to be able to create dynamic volumes on
separate disks for the following purposes:
o databases
o transaction logs
o split-mirror snapshots of the database stores and transaction logs volumes
Exchange Storage Group databases and transaction logs can be located on direct attached storage (SCSI or ATA
Disk Drives), or located on any SAN based storage array or JBOD
Quick Recovery Snapshots can be located on Direct Attached Storage (SCSI or ATA Disk Drives) or located in any
SAN based array or JBOD
Off-Host Backup Snapshots must be located on SAN based shared storage accessible by both the Exchange
Server and Backup Exec Media server
The initial Exchange Snapshots should be set-up the first time during times with low system activity. This initial
‘SnapStart’ operation is a one-time event that can be a lengthy process
Database stores and transaction logs for each storage group must be stored on disks contained within a single
dynamic disk group.
Each database should be in a separate volume, but the volumes may share the same dynamic disks.
Mailbox stores and public stores must be stored on separate volumes in order to be able to recover each
independently.
Database stores and transaction logs must be in separate volumes in order to perform a roll-forward recovery to the
point of failure.
Database stores and transaction logs should be on separate disks so that disk failure does not affect both the
database stores and transaction logs.
Transaction logs should always be configured in a redundant layout. The preferred software layout is RAID 0+1
(mirrored striped) volumes as this provides better read and write performance than RAID 1 (mirrored) alone. The
transaction log will generate the most I/O and thus should use the highest performance disks available.
The preferred layout for the database stores is hardware RAID 5, software RAID 1 (mirrored with logging enabled)
or software RAID 0+1 (mirrored striped). Note FlashSnap is not supported for software RAID 5 volumes.
No more than six volumes should be associated with a storage group. One volume should contain the transaction
logs and up to five other volumes may contain databases.
By default, the First Storage Group is mapped to the boot drive. The boot drive cannot be snapshotted. Move the
components of the First Storage Group to new volumes not on the boot drive.
Copyright © 2005 Symantec Corporation. All rights reserved. Symantec, the Symantec Logo, VERITAS, Backup Exec, the VERITAS Logo and all other VERITAS product names and
slogans are trademarks or registered trademarks of Symantec Corporation or its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners.
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Create a unique name for the metadata file of each shadow copy set you create and maintain.
Periodically backup your metadata files to ensure they will be available for recovery.
For Quick Recovery solutions, VERITAS recommends that you create or refresh a shadow copy set immediately
after a Full Backup just after the database has been checked for corruption and the transaction logs have been
truncated. Thus, you are assured an image of a clean database. Additionally, you may wish to create another
shadow copy set after an Incremental Backup. Create this shadow copy set on a separate set of disks rather than
refreshing the shadow copy set taken after the Full Backup. This practice ensures you are not overwriting a shadow
copy set of a clean database with an image of a potentially corrupted database.
FOR MORE INFORMATION
Symantec Backup Exec
http://www.veritas.com/Products/www?c=product&refId=57
Symantec Backup Exec - Advanced Disk Based Backup Option
http://prod.veritas.com/Products/vnet?c=option&refId=368&productId=57
VERITAS Storage Foundation for Windows
http://www.veritas.com/Products/www?c=product&refId=31
VERITAS FlashSnap
http://www.veritas.com/Products/www?c=option&refId=261&productId=31
Copyright © 2005 Symantec Corporation. All rights reserved. Symantec, the Symantec Logo, VERITAS, Backup Exec, the VERITAS Logo and all other VERITAS product names and
slogans are trademarks or registered trademarks of Symantec Corporation or its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners.
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