EMC SnapView

EMC® SnapView™ software helps make applications and data accessible when and where you need them by

creating mountable snapshots or full-copy clones of production data on your CLARiiON® array. The process is

transparent to the primary server, and the resulting data copy is available to any secondary server with

appropriate access privilege. EMC SnapView software is designed to:

• Increase application availability, reduce scheduled downtime

• Improve data recovery and application consistency

• Minimize recovery time by creating frequent point-in-time images

• Integrate with Microsoft® Exchange®, SQL Server™, and Oracle® environments

• Be easily managed with EMC Navisphere® Management Suite

Better backups: It's all about information access

In the global economy, information must be accessible all the time. If your data is unavailable, it’s not working

for you, processing transactions and serving your customers, that’s money lost. SnapView software can help

you back up faster and more flexibly, so you can be up and serving customers for more hours of the day. Reduce

backup windows to just seconds using snapshot copies and keep applications online and productive. You can

also backup more frequently for daily disaster protection.

EMC SnapView

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Faster application development, reliable testing and more

EMC® SnapView™ lets you create multiple copies of production data. The same local copy of data that can be

presented to a backup utility for processing can also be presented, readable and writable, to development hosts

for rapid application development and testing. SnapView can help you reduce development time and enhance

reliability by testing applications with current data. With multiple data copies, you can run testing, decision

support, debugging or routine maintenance in parallel.

How SnapView works

SnapView lets system administrators create, in background mode, a mountable snapshot or full-copy clone/BCV

of production data. The process, handled on the Dell/EMC array, is transparent to the primary server, yet the

resulting data is available to any secondary server with the appropriate access privileges.

When you start a SnapView snapshot session, the snapshot becomes active and I/O to the source LUN

continues. When the production server issues a write to any data in the source LUN being snapped, SnapView

implements a copy-on-first-write algorithm to copy the original block into a private area on the array before

modifying the original data. This private area is called the SnapView Save Area. For any changed block, the copy

happens only once, the first time the block is modified.

A snapshot is composed of all the unchanged blocks in the source LUN, plus the blocks that have been written

into the SnapView Save Area. The SnapView Save Area contains only the original data blocks written to it when

those blocks were about to be changed in the source LUN. Thus, the storage capacity required to implement

SnapView is merely a fraction of the size of the source LUN.

The snapshot process allows I/O to continue to the production file system with no disruption in service, while

other applications and servers have complete access to the snapshot of the data, if permissions allow. The

resulting snapshot is fully readable and writable by a secondary server. SnapView also supports a feature called

snapshot rollback. Snapshot rollback enables you to restore snapshots directly to production volumes.

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Alternatively, you can use SnapView™ to create a full-image copy of your volume and present it to a secondary

server as a unique LUN. This full-image copy is called a business continuance volume (BCV) or clone. SnapView

can track all changed blocks and incrementally re-establish the BCV—copying only changed tracks to the

BCV—to bring it back into sync with the original. You can also incrementally restore the image from the BCV

back to the original volume.

Clones/BCVs differ from snapshots in that they are physically separate copies of your data—no portion is

shared between the original and the clone/BCV volumes. Physical or logical loss of data on the original will not

affect the data contained in the clone/BCV, or vice versa.

SnapView can manage up to eight clones/BCVs and eight snapshot copies of a volume. In addition, SnapView

allows you to have up to eight snapshots of each clone/BCV you’ve made. This greatly expands the number of

data replicas you can generate and use—for backups, application development, testing, decision support—

whatever you need the data for.

DELL ENTERPRISE SERVICESDell™ Services can deliver the services you needto realize the full value of your IT investment.Complementing our award-winning products,these IT infrastructure services incorporateoperational excellence, accountability and value.

By utilizing our best practices, proven processesand expertise in implementing standards-basedtechnologies, we can help strengthen your ITinfrastructure and enable you to adopt evolvingtechnologies. Whether you need support,deployment, asset management, training, certification,planning or professional services – individually orbundled as a total solution – you can count on Dell.

Strengthening Your IT Infrastructure

Our planning services help integrate your newenterprise hardware into your existing or evolvingIT infrastructure. We can provide guidancewhether you’re adding a single or multiple servers,storage area network or high-performancecomputing cluster.

We can also help you enhance the overallperformance of your IT infrastructure and datacenter by consolidating software and hardware,developing a business continuity plan andmigrating to standards-based technologies.

Simplifying Deployment

Dell simplifies implementation with comprehensiveservices that accelerate deployment of newhardware and IT solutions. During the initialsystem-build of your server, we can customizesoftware and hardware to match your specificrequirements. By helping you rapidly deploy newcapabilities while minimizing disruptions, we cancontribute to improved efficiencies and lower costs.

Our training services provide education andcertification courses to help you better manageand use your new hardware so you can reap thefull benefits of standards-based technologies.

Providing Award-Winning Service & Support

Your server and storage infrastructure is centralto your business, which is why you need a partnerwho can help minimize downtime and keep yourbusiness-critical systems running efficiently. Our enterprise support services are designed to protect your entire enterprise or to focus onspecific systems. These customizable servicesinclude hardware and software support withvaried response levels, account management and remote resolution.

We can also help you enhance the performanceof your data center and provide managed ITsolutions and asset management services for yourenterprise, desktop and notebook environments.

The Dell Enterprise Command Centers (ECC) – whichutilize industry-leading technologies and tools thatspeed up problem resolution – efficiently route spareparts and direct expert technicians to your site.

Services vary by region. For more information,please visit www.dell.com.

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Dell is not responsible for errors in typography or photography. Dell, the Dell logo are trademarks of Dell Inc. EMC, CLARiiON and Navisphere are registered trademarks and SnapView, SAN Copy and MirrorView are trademarksof EMC Corporation in the United States of America. Microsoft and Microsoft Exchange are a registered trademark and SQL Server is a trademark of Microsoft Corporation in the United States of America and/or other countries.VERITAS is a registered trademark and NetBackup is a trademark of VERITAS Software Corporation in the US and other countries. LEGATO is a registered trademark and NetWorker is a trademark of LEGATO Systems, Inc. Oracleis a registered trademark of Oracle Corporation. Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell disclaims proprietary interestin the marks and names of others. © Copyright 2006 Dell Inc. All rights reserved. Reproduction in any manner whatsoever without the express written permission of Dell Inc. is strictly forbidden. For more information contactDell. February 2006, Kolar.

SnapView™ now offers a new feature called consistent split/restore. Consistent split/restore helps ensure

consistency of data across multiple interrelated LUNs when you are creating a SnapView snapshot or clone of

those LUNs. If you’re creating snapshots or clones in an environment with multiple interrelated databases or

applications, or applications without a native hot-backup feature, consistent split/restore can help you ensure

data integrity. You can have up to 8 LUNs in a consistent split/restore on CX300, CX400, and CX500 storage

system and up to 16 LUNs in a consistent split/restore on CX600 and CX700 systems. All LUNs in a consistent

split/restore operation must reside in the same CX array.

SnapView works with industry-standard backup and recovery software such as EMC® LEGATO® NetWorker™ and

VERITAS® NetBackup™. Because you use a secondary server to access the SnapView replica, no changes to the

backup software are needed. SnapView also integrates seamlessly with Dell/EMC-array-based remote

replication products including SAN Copy™, MirrorView™/Synchronous and MirrorView/Asynchronous.

Simplified management

EMC Navisphere® Management Suite allows you to manage all Dell/EMC-related activities—from system

management to all your SnapView, MirrorView and SAN Copy sessions—using a centralized Web browser.

EMC Replication Manager provides application-centric management of replicas including SnapView snapshots

and clone/BCVs, and integrates SnapView with leading industry applications such as Microsoft® SQL,

Microsoft® Exchange and Oracle®. Replication Manager software uses the Microsoft® VDI Interface and the

Microsoft® VSS Interface for creation and restoration of SnapView replicas of SQL Server and Exchange 2003

respectively. As a result, SQL and Exchange administrators can create SnapView replicas of their application

data without any disruption to their production environment.

Visit www.dell.com for more information.

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