Redesign your Backup with Deduplication - Dell EMC US · Flexible replication Home VM Home VM ... Trust but verify—hope is not a strategy Data verification CheckSum ... Inline Deduplication

Redesign your Backup with Deduplication

1© Copyright 2010 EMC Corporation. All rights reserved.

AgendaAgenda

RegistrationRegistration

Welcome (5 minutes)

Introduction to Deduplication for Backup (15 minutes)Introduction to Deduplication for Backup (15 minutes)

Lunch or Dinner

EMC Data Domain and Avamar (60 minutes)EMC Data Domain and Avamar (60 minutes)

Discussion and Wrap-up (30 minutes)


Introduction to Deduplication for Backup


Today’s Data Protection ChallengesToday s Data Protection ChallengesMajor trends driving the transformation of backup environments

Unabated Data Growth – Backup typically represents a factor

of 4 to 30 times production capacity

Digital Information Created and Replicated Worldwide2,500 of 4 to 30 times production capacity

– Daily, weekly, and monthly full backups kept for months or years

– New requirements to keep more

2,000

1,500

1 000xaby

tes 5x growth in

4 yearsNew requirements to keep more data for longer periods

1,000

500

0

Ex

20122011201020092008 20122011201020092008

Source: IDC Digital Universe white paper, sponsored by EMC, May 2009


Today’s Data Protection ChallengesToday s Data Protection ChallengesMajor trends driving the transformation of backup environments

Server virtualization– Dynamic environment causes

increased complexity

Old ParadigmOld Paradigm20 percent resource

utilization20 percent resource

utilization

Old Paradigm20 percent resource

utilizationincreased complexity– Virtual machine sprawl creates

protection challenges– Server consolidation creates high

100%100%

80%80%

60%60%

tiliz

atio

ntil

izat

ion 100%

80%

60%

tiliz

atio

n

Server consolidation creates high server utilization leaving little bandwidth for backup

40%40%

0%0%

20%20%

CPU

Ut

CPU

Ut

40%

0%

20%

CPU

Ut

New ParadigmNew Paradigm80 percent resource 80 percent resource

New Paradigm80 percent resource p

utilizationp

utilization

100%100%

%%ion

ion

putilization

100%

%ion

80%80%

40%40%

0%0%

60%60%

20%20%C

PU U

tiliz

ati

CPU

Util

izat

i

ESXServerESXServer

HardwareHardware

Shared Physical ResourcesShared Physical Resources

80%

40%

0%

60%

20%C

PU U

tiliz

ati

ESXServer

Hardware

Shared Physical Resources


0%0%yy

0%y

Optimization Technologies Take Center StageOptimization Technologies Take Center Stage

OptimizationServer VirtualizationVMServer Virtualization

OptimizationWANOptimizationNetwork

Optimization Deduplication Storage

Backup & Recovery


Deduplication Dramatically Reduces Storage C i R iCapacity Requirements

30

Deduplication20

tore

d

Deduplication1010--30x less data stored vs. 30x less data stored vs. fullsfulls + + incrementalsincrementals with with typical retention policiestypical retention policies

10Dat

a St typical retention policiestypical retention policies

01 5 10 15 20

Weeks in Use


Deduplication Storage Traditional Storage

The Move is On!The Move is On!

Heat Index Rank: 1F1000 Deduplication Implementation Storage Networking Wave 13F1000 Deduplication Implementation


(11/18/09): F1000 Sample. Wave 8, n=148; Wave 9, n=150; Wave 10, n=151; Wave 11, n=127; Wave 12, n=147; Wave 13, n=183. *Technology was previously categorized as Deduplication. **Technology was previously categorized as Deduplication/ Capacity Optimized Storage/Single Backup Instance Store. ***Technology was previously categorized as Single Backup Instance Store Software.

EMC Backup and Recovery with DeduplicationEMC Backup and Recovery with Deduplication

Retain longerKeep backups onsite longer with less disk for fast, reliable restores and eliminate the use of tape forreliable restores, and eliminate the use of tape for operational recovery.

Replicate smarterMove only deduplicated data over existing networks for up to 99% bandwidth efficiency and

WANnetworks for up to 99% bandwidth efficiency and cost-effective DR.

Recover reliablyContinuous fault-detection and self-healing ensure data recoverability to meet SLAs.


data recoverability to meet SLAs.

Retain More Backups Longer with Less DiskEliminate the use of tape for operational recovery

Backup Cumulative Estimated PhysicalData Logical Reduction

First Full 1 TB 4x 250 GB

W k 2 3 8 TB 10 366 GB

Week 1 2.4 TB 8x 308 GB

First Full 1 TB 4x 250 GB

Week 2 3.8 TB 10x 366 GB

Week 3 5.2 TB 12x 424 GB

Week 4 6.6 TB 14x 482 GB

Month 2 12.2 TB 17x 714 GB

Month 3 17.8 TB 19x 946 GB

Month 4 23.4 TB 20x 1.2 TB


4-Month Total 23.4 TB 20x 1.2 TB

Replicate Smarter Leveraging Existing Networks99% bandwidth efficiency

On Premise Off Premise

DB DB

WAN

DB DB

WAN

Flexible replication

Home

VM

Home

VM

Deduplicated Backup

VM VM

• Move data offsite over existing networks for fastest time-to-DR readiness

• Map method to application recovery requirements and DR policies


• Map method to application recovery requirements and DR policies

Recover Reliably from DiskHighest levels of data integrity

• Backups are the data store of last resort

• Improve your recovery SLAs with the fadvantages of disk-based data protection

VerificationAll data is read and

ifi d ft it i itt

DBDB

verified after it is written

HomeHome Self-healingC i h fl

VMVMContinuous on-the-fly error detection and correction


EMC: The #1 Choice In Data Reduction/ D d li ti i F1000 C iDeduplication in F1000 Companies

Competitor

CompetitorCompetitor

Competitor

Competitor EMC highest Competitor

Competitor

in use and in plan.

Competitor

Competitor

Competitor

Competitor

13© Copyright 2010 EMC Corporation. All rights reserved. SOURCE: TheInfoPro Wave 13 Storage Study (11/12/09): F1000 Sample: n=183.

Data Domain and Avamar


Deduplication is Driving the Evolution of B k d RBackup and Recovery

Backup/Recovery Architecture

Backup/MediaManager

Onsite Backup Storage

Disaster RecoveryStorage

Application BackupClients

Conventional(T t i )

Tape Tape

DB

Backup Software

(Tape-centric)VTL/Tape

DBVTLBackup Software

Transformational(Disk centric) VM

HomeDeduplication storageBackup Software

(Disk-centric) VM

Data Protection Management Software

Deduplication backup software and system


on premise off premise

Deduplication is Driving the Evolution of B k d RBackup and Recovery

Backup/Recovery Architecture

Backup/MediaManager

Onsite Backup Storage

Disaster RecoveryStorage

Application BackupClients

Conventional(T t i )

NetWorker Tape Tape

DB(Tape-centric)NetWorker Disk

Library DL/TapeDB

Transformational(Disk centric)

Data DomainNetWorker

VM

Home

(Disk-centric)Avamar

Data Protection Advisor

VM


on premise off premise

EMC Backup and Recovery with DeduplicationEMC Backup and Recovery with Deduplication

Retain longerKeep backups onsite longer with less disk for fast, reliable restores and eliminate the use of tape forreliable restores, and eliminate the use of tape for operational recovery.

Replicate smarterMove only deduplicated data over existing networks for up to 99% bandwidth efficiency andnetworks for up to 99% bandwidth efficiency and cost-effective DR.

Recover reliablyContinuous fault-detection and self-healing ensure data recoverability to meet SLAs.


data recoverability to meet SLAs.

EMC Data Domain

T d

Dedupe Everything Without Changing AnythingEMC Data Domain

File Systems and Apps

TodayMultiple Platforms for Backup, Archiving, DR

Backup AppsVMware

NAS SAN DAS N t k

…increased management

N D d Di k

Non-Dedupe

NAS, SAN, DAS Network Non-Dedupe Disk…no data reduction,

inefficient replication or clone to tape p

Disk

$WAN

clone to tape

Tape BackupTape Backup…long recoveries from offsite, shipment risk, media failures


EMC Data Domain

With D t D i

Dedupe Everything Without Changing AnythingEMC Data Domain

File Systems and Apps

With Data DomainResource Less.Manage Less.

Easy integration with existingArchive AppsVMware

NAS SAN DAS

Easy integration with existing backup/archive apps and infrastructure simplifies and centralizes management

Backup Apps

N t kNAS, SAN, DAS Fastest Time to DR-Readiness for Backup

Replication flexibility to ensure data available for recovery faster

Network

Disk-Based Backup, Archiving, Networked DR

data available for recovery faster than any other method

Lower Cost per Gigabyte f B k

WAN

for BackupEfficient disk access minimizes the number of disks needed to deliver high throughput

DR Site


Data Domain: Leadership and InnovationData Domain: Leadership and Innovation

• Deduplication storage systems > 12,000 systems installed> 4,300 customers,> 2,600 petabytes under Data Domain protection worldwide

• A history of industry firsts

2003 2004 2005 2006 2007 2008 2009

First Dedupe NASFirst Dedupe NAS First Dedupe GatewayFirst Dedupe Gateway Largest DedupeArrayLargest DedupeArray

Fastest BackupControllerFastest BackupController

First Dedupe Volume ReplicationFirst Dedupe Volume Replication

First DedupeDirectory ReplicationFirst DedupeDirectory Replication

Cascaded ReplicationCascaded Replication


First Dedupe VTLFirst Dedupe VTL First Dedupe Nearline StorageFirst Dedupe Nearline Storage

Data Domain BasicsData Domain BasicsEasy integration with existing environment

C t l Ti

CIFS, NFS,

Control Tier

Target Tier DR TierBackup & Archive Applications

Replication

CIFS, NFS, NDMP, OpenStorage

Ethernet

VTL over FC

DD880 Appliance

4U

DD880 Appliance

2 - 6 ports10 and 1 Gb Ethernet; 4 Gb Fibre ChannelRAID-65.4 to 71 TB usable capacity with shelvesp y5.4 TB/hr speed1 TB or 500 GB 7.2k rpm SATA HDD in shelfFile systemNVRAM


NVRAMN+1 fans and redundant, hot-plug power supplies

Scalability: Data Domain Systems TrajectoryScalability: Data Domain Systems TrajectoryData Domain SISL™ scaling architecture

3,000 2011 (est.)

MB

/sec

.

1,500 DD880 (2009)

750ough

put M

1,500 DD880 (2009)

DD690 (2008)

Thro 5-Year Improvement:

Throughput: ~40xCapacity: ~60x

( )

40 DD200 (2004)

1.25 35 70 … 300


Addressable Capacity in TBPost-RAID (Physical)

Methodology: Inline vs. Post-Process gyDeduplication

Post Process:Deduplication After Storing

Inline:Deduplication Before Storing

DeduplicationStore Deduplication

3x disk accesses to shared store

Process contention worse if more of them− Copy to tape: Too slow to stream tape

R SLA di t bilit

Other activities unimpeded− Predictable− Simpler

to shared store

− Recovery: SLA predictability− Replication: Poor time-to-DR− Deduplication itself if interleaved with backup or

restore

Simpler


More admin to fight these issues

Data Integrity: Data Invulnerability ArchitectureData Integrity: Data Invulnerability ArchitectureTrust but verify—hope is not a strategy

Data verificationCheckSumDedupe, write to disk File System

GenerateChecksum

VerifyData

Verify the file system metadata integrityp

Verify

Self-healing file systemGlobal Compression

Local Compression

g y

Verify user data integrity

CleaningExpired dataDefrag

f

Local Compression

RAID Verify stripe integrity

OtherRAID 6

Verify

RAID-6NVRAMSnapshots


Network-efficient Replication for True DRNetwork efficient Replication for True DRTrue DR; lowers WAN costs; improves SLAs

1-5%

DD120

Flexible replicationMany-to-oneBi-directional

DB

Archive Data

System-to-systemCascaded

Home

DIR A

1-5%Backup Data DD120

WAN

1-5%Home

Source:Remote Sites Destination:

Data Center Hub

DDX with DD880sDD565


Data Center Hub Supports hundreds

of remote sites95-99% cross-site bandwidth reduction

Fast Time to DR ReadinessFast Time to DR Readiness

Data DomainInline Deduplicationand Replication

DR-ReadyBACKUP TO DATA DOMAIN

Dedupe and replicate

Post-Process Dedupe

R li ti t t

BACKUP TO CACHE

DR-Ready Replication starts after ingest

P t P D d

Dedupe and replicate, <50% ingest speed.2x longer if uncompressed at fixed bandwidth.

BACKUP TO CACHEPost-Process Dedupe

Replication starts during ingest

BACKUP TO CACHE

Dedupe and replicate, <50% ingest speed.2x longer if uncompressed at fixed bandwidth.

DR-Ready

VTL / Tape / Truck BACKUP TO VTL

Copy to tapeT k t t T k f t

Recall tapes

?


Truck to storage Truck from storage

Industry’s Most Scalable Inline yDeduplication Systems

DD690g Gateway

DD600

DD880

DD600 Appliance Series

DDX Array SeriesSoftware Options:OpenStorage VTL ReplicatorDD140 Remote Office

DD140 DD610 DD630 DD660 DD690/g DD880 DDX Array

OpenStorage, VTL, Replicator and Retention Lock Up to 16 Controllers

Internal or External Storage

DD140 Remote Office Appliance

Speed 450 GB/hr 675 GB/hr 1.1 TB/hr 2 TB/hr 2.7 TB/hr 5.4 TB/hr 86.4 TB/hr

Logical Capacity 17-43 TB 75-195 TB 165-420 TB .520-1.31 PB .710-1.7 PB 1.4-3.5 PB 22.6-56.7 PB

Raw Capacity 1 5 TB Up to 6 TB Up to 12 TB Up to 36 TB Up to 48 TB Up to 96 TB Up to 1 5 PB


Raw Capacity 1.5 TB Up to 6 TB Up to 12 TB Up to 36 TB Up to 48 TB Up to 96 TB Up to 1.5 PB

Usable Capacity .86 TB Up to 3.98 TB Up to 8.4 TB Up to 26.1 TB Up to 35.3 TB Up to 71 TB Up to 1.13 PB

Why EMC Data DomainyDedupe everything without changing anything

• Less disk to resource, less to manage– CPU-centric deduplication– InlineInline– Green

• Simple, mature, and flexibleSi l t li– Simple, mature appliance

– Nearline tier: any fabric, any software, backup or nearline applications

Data Domain • Resilience and DR

– Storage of last resort– Cross-site Global Compression™

Deduplication Storage Systems

– Data center or remote office


University – School of BusinessyConsolidated 1 ½ racks to only 3u

Customer Challenges

Too much capacity needed to meet

Data Domain SolutionBusiness

retention requirements

Arts & Sciences

Provost DR SiteNAS, SAN, DAS

Problems with tape management and concerned about security

Arts & Sciences

?

Needed to migrate to affordable replication solution for backup data

No changes to infrastructure requiredReduced footprint, cooling, managementEliminated tape transport servicesp p p pGained fast DR synchRetain data for 6 weeksRecaptured admin time of 2 days per week

Replicate


Data Center DR Facility

Large Rail Transportation NetworkLarge Rail Transportation Network27 site fan-in and eliminated 50% of tape

Customer Challenges

Many small, remote sites using tape

Data Domain Solution

27 Site Fan-in

400TB of data to protect Data Center

Fan in

15 hour delay to start DR processCentrally managed backup operations~ 20x data reductionReduced tape admin by 10 hours per week‘Lights out’ backup at 27 remote sitesUses tape only at the data center


EMC AvamarEMC AvamarNever Backup the Same Data Twice

Edge DataNASVMware

WITH AVAMARTODAYVMware NAS Edge Data

VMware

Edge DataNASVMwareVMware NAS Edge Data

Remote Desktops /VMware

Remote Desktops / Laptops

?Move less data to eliminate

backup bottlenecksFull NAS

Remote office backup using tape locally;

?…and always recover in one

simple step

backup bottlenecksHighly utilized virtual serversslow backups

Full NAS backups are slow, moving all data across LAN

tape locally; desktops / laptops poorly protected


EMC AvamarEMC AvamarDeduplication backup software

• Integrated software & hardware solution– Deduplicates across sites and servers globally– Effective full backup every time

Si l– Single step recovery– Backup process reduces data sent over the network

and stored – Variable-length sub-file segments for optimal

deduplication

• Integrated high availability and reliability – RAIN for high availability and fault tolerance Avamar

Deduplication Backup Software– Avamar server and data recoverability verified daily– Replication between servers

• Flexible deployment options

Deduplication Backup Software

– Avamar software – Avamar Data Store – Avamar Virtual Edition for VMware environments


EMC Avamar Moves Less DataEMC Avamar Moves Less Data

Network

A

C C

D

B

A

B

A

C C

D A

BC

D

fB

D

B B

A C

B

DA

BB

A

1. Divides data into sub-file elements

2. Determines if elements are unique2. Determines if elements are unique or duplicate

3. Backs up only data that is unique


4. Data sent is compressed and encrypted

VMware Backup ChallengesVMware Backup Challenges

Traditional backupmoves ~200% weekly

Avamarmoves ~2% weekly

Dedupe within the VM

li i t

Bottleneck!

eliminates bottleneck

Limits server consolidation

Bottleneck!

90% faster backups95% less data movedconsolidation

Backup window challenges

95% less data moved50% more server consolidation


EMC Avamar for VMware Impact

T diti l B k

EMC Avamar for VMware Impact

A G t B k

VMware Guest server backup

CPU Usage Network Usage Disk Usage

Traditional Backup v Avamar Guest Backup

Time Time TimeTime Time Time


EMC Avamar for VMware Customer SuccessEMC Avamar for VMware Customer SuccessCustomer reduced VMware backup cost by 50%

Avamar Avamar

Avamar AnswerTraditional Backup for VMware

Avamar Avamar

Replication

VMware Virtualization Layer

VMware Virtualization Layer

x86 Architecture

Reduced Cost by 50%

Central Site DR Sitex86 Architecture

Long backup windows that limit consolidationMultiple restore steps

2009 save of $2,900,000; less than 24 month payback2X increase in ESX hardware efficiency80% reduction in backup windowMultiple restore steps

High FTE costs for NetBackup administration

80% reduction in backup windowPoint-and-click restore from disk in minutesEliminated offsite tape storage (& costs) with replication for DR


with replication for DR

Today’s NAS Backup ChallengesToday s NAS Backup Challenges

Everyone wants larger file shares, greater consolidation

However….Terabytes of redundant data

Full backups can take days to completeIncremental backups are time consuming and

ybacked up nightly

Incremental backups are time consuming and make restores complex


EMC Avamar for NAS ImpactEMC Avamar for NAS ImpactImproves NDMP backup

Eliminates time-consuming, traditional, full NDMP backups

Before Avamar

Weekend Weekend

One-step restore from full backup image – always

DailyIncre-mental

WeekendFull

WeekendFullDaily

Incre-mental

DailyIncre-mental

DailyIncre-mental

DailyIncre-mental

Cost effective disaster recovery After Avamar

DailyFull

DailyFull

DailyFull

DailyFull

DailyFull

DailyFull

DailyFull“This is a no-brainer. Anyone

that has a…NAS system yshould take a serious look at Avamar's NDMP Accelerator.”


EMC Avamar for NAS Customer SuccessEMC Avamar for NAS Customer SuccessCustomer reduced NAS backup cost by 40%

Avamar AnswerTraditional Backup for VMware

Avamar AvamarAvamar Avamar

Replication

Avamar NDMP Accelerator

Escalating backup infrastructure costs

NAS

Reduced Cost by 40%

Central Site DR Site

Escalating backup infrastructure costs Annual risk to corrupt or lost data $1.2M

NDMP backup taking 30+ hours with

Reduced Cost by 40%2009 savings of $1,457,000Reduced backup time from 30 hours to 6 hoursNDMP backup taking 30+ hours with

NetBackupLarge quantity of tapes required for backup

to 6 hoursReduced risk by eliminating missed backup windowsSingle step restore


g p

EMC Avamar for Remote Offices

Primary Site ‐ Avamar DR Site ‐ Avamar

EMC Avamar for Remote OfficesProtects remote offices at datacenter using existing bandwidth

Primary Site ‐ Avamar DR Site ‐ AvamarMoves just 2–5% of primary data per week

Daily full backups in fraction of timey pRetention of months vs. days of full backups in the same space

Direct to Primary Site Direct to Local Data Storeli i

Direct to Avamar Virtual EditionliData Store Replicate to Main Data Store

Local Avamar Data Store

Replicate to Data StoreA VE

OS

Avamar Software Agents Avamar Virtual Edition


g

EMC Avamar for Remote Office Customer SuccessEMC Avamar for Remote Office Customer SuccessCustomer reduced remote office backup cost by 40%

Avamar AnswerTraditional ROBO Backup

Remote Sites Central Avamar AvamarRemote Sites Central

ReplicationAgent

Agent

f /Reduced Cost by 40%

$5 049 000 TCO S 60 M th

Central Site DR SiteAvamar node

High software/hardware maintenanceOffsite tape storageHigh system administration FTE

$5,049,000 TCO Save over 60 Months2009 Save of $1,640,00024 month payback100% elimination of hardware inHigh system administration FTE

Missing SLAs100% elimination of hardware in agent-only small sites50% elimination of hardware in medium/large sites


Elimination of offsite costs with replication

EMC Avamar for Desktops and LaptopsEMC Avamar for Desktops and LaptopsProtect Employee Data from the Edge to the Data Center

Desktop

Replication

Web Browser Interface

WANWAN/LAN

Laptop

Central Site Remote Site

Puts power in end-users’ hands– Self-managed restores

All the benefits of Avamar– Data deduplicated at the sourceg

– Document-level search engine– Simple, yet powerful, set of tools for end

users and for administrators Reduces Help Desk involvement

p– Move 99% less data - 10X faster backups– Minimal impact on PC & network resources– No-cost agents; cost effective, easier mgt.

O l ti f d t t t ffi


– Reduces Help Desk involvement – One solution for data center, remote office and desktop/laptop

Why EMC AvamarWhy EMC AvamarNever backup the same data twice

Move less data to eliminate backup bottlenecksAlways recover in one simple stepL t diti l b k TCO ith t i llLowers traditional backup TCO with typically a 12-24 month payback

Additional Benefits: NASReduces demand on network

Additional Benefits: “Edge Data”

Additional Benefits: VMwareIncreases server Reduces demand on network

and filer resources during backup – increases NAS

utilization

Centralizes backup to data center using existing

WAN bandwidth

Increases server consolidation

ratios up to 50%


EMC Data Domain and AvamarC ata o a a d a aCustomer Success: Worldwide Financial Institution

AFTERBEFORE

TapeMinimized

Main data center, regional data centers and over 200 remote offices

Data Domain Covers entire environment works with

Less

LessManagement

VMware and TSM backup and recovery bottlenecks limiting consolidation

Tape used in all locations and shipped offsite

Tapes containing data on 12 million

Covers entire environment, works with existing backup software and infrastructureReplicates offsite for fast and safe DR7 PB protected

Avamar LessRisk

3.5MLess$$$

Tapes containing data on 12 million customers lost in transport to offsite storage Solved VMware backup challenge in data

centersBacks up 200+ remote sites dailyAvamar $3.5M TCO savings over 3 years

$$$

LessNetwork

g y(VMware use Case)

More

MorePerformance


More Secure

Which Deduplication Solution is Right for You?Which Deduplication Solution is Right for You?

Let Us Help You Determine the Right Solution

D d

Backups are running all day long,the infrastructure is overloaded

Depends on:– Current backup challenges and environment– Application and data type– Service level requirements

Backup, e-mail, and file system assessments, TCO tools Deduplication effect on,

– Data Deduplication Assessment– Quick Scripts Backup Assessment– Exchange Assessment

Deduplication effect ondaily incremental backups

g– Files System Assessment


Take Advantage of EMC Education ServicesTake Advantage of EMC Education Services

E h D d li i d B k R k l d d killEnhance your Deduplication and Backup Recovery knowledge and skillsFeatured Learning Paths– Avamar

D t D i– Data Domain – Disk Library– NetWorker– Data Protection Advisor

Browse Courses Online Engage EMC Education Services

Two ways toget started

TEL: 1-888-EMC-TRNGhttp://education.EMC.com/BackupandRecovery



SummarySummary

• Data protection landscape is shifting

• Redesign your backup with

Special Attendee OfferFree Data Profiling Assessment

• Redesign your backup with deduplication --the move is on!

– Retain longer

Request yours today

– Replicate smarter– Recovery reliably

Calculate how much deduplication can save you

– Data Domainwww.dedupecalculator.com

– Avamarwww.emc.com/backupdedupe

© Copyright 2010 EMC Corporation. All rights reserved.48

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Documents

Redesign your Backup with Deduplication - Dell EMC US · Flexible replication Home VM Home VM ... Trust but verify—hope is not a strategy Data verification CheckSum ... Inline Deduplication