High Availability and Disaster Recovery Considerations for Hyper-V

8/7/2019 High Availability and Disaster Recovery Considerations for Hyper-V

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igh Availability andisaster Recoveryonsiderations for Microsoft-yper V Bob Roudebush-Double Take Software

WSV311


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Agenda

Hyper-V Virtualization ScenariosHow VM Availability, Disaster Recovery andBackup/Recovery Relate to BusinessContinuity

Anatomy of a Hyper-V Virtual MachineBackup/HA/DR for Hyper-V

Backup/Recovery Implications for Hyper-V VMs

High Availability Implications for Hyper-V VMs

Disaster Recovery Implications for Hyper-V VMs

Geo-Clustered Hyper-V VM Demonstration

Summary / Q&A


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Hyper-V Virtualization

Scenarios

B u sin e ssB u sin e ssC o n tin u ityC o n tin u ity

D yn a m icD yn a m icD atacenterD atacenter

ServerServerC o n so lid a tio nC o n so lid a tio n

Test and DevTest and Dev


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B u sin e ss C o n tin u ity,Resumption of full operations combining People Processes and

Platforms

Disaster Recovery- ,Site level crisis data and IT operations resumption

Backup and RestorePresumes infrastructure is whole

% /97 is file small unit related

High AvailabilityPresumes that the rest of the

environment is active

Keeping the Business Running


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VHDHD haredStorage

/ackup Recovery

econdarySiterimarySite

torageArray torageArray

Virtualization reduces BC costs and minimizes businessVirtualization reduces BC costs and minimizes business increasing the availability of infrastructureincreasing the availability of infrastructure extending protection to more applicationsextending protection to more applications ,simplifying backups recovery and DR testing,simplifying backups recovery and DR testing

Business ContinuityBusiness Continuity

High AvailabilityHigh Availability

Disaster RecoveryDisaster Recovery

Backup and RecoveryBackup and Recovery

isaster Recovery

/ackup Recovery /ackup Recovery

ClusteringClustering

/Quick Live Migration/Quick Live Migration

Business Continuity

w/Virtualization


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The Architecture of Hyper-V

Windows Server 2008

VSPWindows

Kernel

Applications Applications Applications

-Non Hypervisor Aware OS, Windows Server 2003 2008

WindowsKernel VSC

VMBus Emulation

Designed for Windows Server Hardware

Windows Hypervisor

-Xen Enabled Linux Kernel

Linux VSC

Hypercall Adapter

ParentPartition

Child Partitions

VM Service

WMIProvider

VMWorkerProcesses

UserMode

KernelMode

Ring-1

IHV Drivers

VMBus

VMBus

Applications


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The Anatomy of a Hyper-V

VM . HD VM data. VHD VM snapshots*. IN Contents of VM RAMfor a saved state*. SV Saved state

( . .,information i e processor)register data

* . ML VM configurationinformation in an industry-

standard XML file


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VM


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VM

:ll VMs are assigned a unique GUID< =" ">logical_id type string 56B19F3FAD06C76416Dlogical_id ll snapshots are assigned a GUID used todentify the snapshot and construct. :elative paths to AVHDs< =" ">guid type string 3E0AC2C EE46C4F495D4guid( )oth the virtualized NIC s in the VM as well( )s the virtual switch es on the host are:ssigned a GUID< ChannelInstanceGuid

=" ">type string { }c66 ChannelInstanceGuid< =" ">SwitchName type string - - witch SM 847f89 SwitchName-ermissions related to Hyper VM are important:o consider< =" ">sid type string - - - 1 5 2 sid


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VM Backup/Recovery

ChallengesExpense Loading Agents in EachGuest OSProtecting Virtualized Applications

(Exchange, SQL, etc.)VMs may Increase Backup/RestoreComplexity

Backing up in the guest Versus

outside the guest Image or file level recovery

Restoring to different hardware if

necessary


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Some VM Backup

TerminologyFile-Level Backup In the GuestImage-Level Backup On the Host

Application Quiescing

O/S Crash ConsistencyApplication Crash Consistency


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Types of VM Backups

Three types of BackupsBacking up the host system

May be necessary to maintain host configuration

But often, not completely necessary

The fastest fix for a broken host is often a completerebuild

Backing up Virtual Disk FilesFast and can be done from a single host-based backupclient

Challenging to do file-level restore

Backing up VMs from inside the VMSlower and requires backup clients in every VM.

Resource intensive on host

Capable of doing file-level restores


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Challenges of Transactional

DBsO/S Crash Consistency is fairly easyQuiesce the NTFS file system beforebeginning the backup

Application Crash Consistency is muchharder

Tx databases like AD, Exchange and SQLdont quiesce just because NTFS does

Restoration without crash consistencywill lose data - DB restores intoinconsistent state and must performa soft recovery


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Dealing with Consistency

When backing up VMs, may need to considerdual approaches: file level backups andimage-level backups

File-level = Restore Individual Files w/Tx Integrity

Image-level = Whole-Server RecoverabilityImage-level backups may not provide applicationcrash consistency!

MSFT and 3rd Party Solutions may integrate

with VSS-aware guest OS and applicationsMicrosoft System Center Data ProtectionManager

3rd Party Backup Solutions


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Integrating Backup w/VSS

VSS = Volume Shadow CopyNo need to power down virtual machinesto do backups

VSS ensures a consistent state in the virtualmachine

Must have backup integration component enabled


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Data Protection Manager2007Data Protection Manager 2007

Recovery Point Objective

15min versus RT for VSs-aware VMs

~1 day versus RT for non VSS-aware VMs

Recovery Time Objective

Automated Monitoring and Failover versuson-demand recovery

Type of Recovery Needed

Disaster Recovery focus on getting back

up and running with the latest copy ASAPOperational Recovery & Disaster Recovery focus on being able to recover multiplepoints in time


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Secondary SitePrimary Site

-DPM for Hyper V-DPM for Hyper V -Live host level virtual machine backup In gue-Live host level virtual machine backup In gue

Bare metal restoreBare metal restore Rapid recovery Continuous Data ProtectionRapid recovery Continuous Data Protection No SAN requiredNo SAN required Protects VMsProtects VMs

( )without hibernation if OS is VSS enabled( )without hibernation if OS is VSS enabled

U p t o e v e r y 1 5 m i n u t e s

Microsoft Data ProtectionManager SP1


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VSS/BackupRecommendations

VSS in Hyper-V does not support:Host-level backups of pass-through VHDs.

Host-level backups of iSCSI volumes in guest VMs

Instead, use guest-based Exchange-aware

streaming backup or VSS backupData Protection Manager 2007

VSS in Hyper-V does support host-levelbackups of VHDs

Hardware-based VSS backups of ExchangeStorage

Supported by the vendor, not Microsoft


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Hyper-V Backup BestPracticesEnsure your backup solution supportsVSS

Support for the VSS writer in Hyper-Vspecifically

Virtual Machine Backup Best practicesLeverage the Hyper-V VSS writer to takeonline snapshots of virtual machines

System Center Data Protection Managerwill provide Hyper-V VSS snapshots

Ability to quickly recover virtualmachines

Replicate snapshots to backup location


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Virtualization & HighAvailability

- dition alN on V irtualized Environm ent-dition alN on V irtualized Environm ent,n tim e is b a d b u t a ffe cts o n ly o n e w orklo a d,tim e is b a d b u t a ffe cts o n ly o n e w o rklo a d

V irtualized Environm entV irtualized Environ m ent Va lu e o f th e p h ysical serve rVa lu e o f th e p h ysical serve r

g o e s u pg o e s u p D ow n tim e is fa r w o rse b e ca u se m u ltip le w o rklo a d s aD ow n tim e is fa r w o rse b e ca u se m u ltip le w o rklo a d s a

-irtualization and High Availability Go Hand-irtualization and High Availability Go Handn Handn Hand


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Microsoft Hyper-V QuickMigration

Provides solutions for both planned andunplanned downtime

Planned downtimeQuickly move virtualized workloads to service

underlying hardwareMore common than unplanned

Unplanned downtimeAutomatic failover to other nodes

(hardware or power failure)Not as common and more difficult

Windows Server 2008 R2 introduces Live-migration supporting movement ofvirtual machines between servers with no loss of service


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Quick MigrationFundamentalsSave state

Save entire virtualmachine state

Move virtual

machineMove storageconnectivity fromorigin to

destination hostRestore state andrun

Restore virtual

machine

etwork Connectivityetwork Connectivity

hared Storagehared StorageVHDsHDs


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Other VM AvailabilityScenarios

Guest-based VM clustering (using WSFC)Cost prohibitive requires Enterprise edition ofWindows Server and shared storage

More complex to install/configure/manage

An option for cluster-aware applications3rd party replication/failover solutions

Use software-based replication/failover toreplicate VMs between Hyper-V hosts (or withinVMs)

Double-Take for Hyper-V

CA XOsoft High Availability

SteelEye LifeKeeper for Windows


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Disaster RecoveryChallengesDowntime is Expensive

Traditional DR is slow/complex

Increased pressed on IT foravailability

Requires specialized training

T h in g s a re C o m p lica te d

/Tra d itio n a lD R re q u ire s id e n tica l H W S Wco n fig s

-D ifficu lt to te st m u lti tie r a p p lica tio n s

/In fra stru ctu re Pe o p le a reE xp e n sive

D u p lica te d a ta ce n te rin fra stru ctu re s

S ig n ifica n t p e rso n n e l re so u rce sre q u ire d


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Virtualization Benefits

Downtime is ExpensiveMore Rapid Backup and Recovery

Quick/Live Migration/Clustering

Requires specialized training

T h in g s a re C o m p lica te d

E lim in a te m a in ta in in g d u p lica te p h ysica lsystem s

,A u to m a te B a c ku p R e c o v e ry a n d D Rprocesses

/In fra stru ctu re Pe o p le a re E xp e n siveR e d u ce e xp e n d itu re o n fa cility a n d

in fra stru ctu re

D im in ish n e e d fo r sp e cia lize d/h ard w are p e rson n el


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Some DR Terminology

RTO Recovery Time ObjectiveHow much data you can afford to lose

RPO Recovery Point ObjectiveHow long you can afford to be down

Hot siteServers up and operational at remote site at alltimes.

Warm site

Servers pre-provisioned at remote site. Tasks tocomplete for failover to occur.

Cold siteEmpty site and servers on retainer awaiting DR

event.


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Hyper-V Recovery "ValueMeals"

Recovery TimeObjective Recovery PointObjective What should I use itfor?

Small >1 Day to Week(s) > 1 Day to Week(s) Development andTesting Systems

Medium > 4 Hours to Day(s) > 4 Hours to Day(s) Workgroup

Applications

Large Minutes to Hour(s) Minutes to Hour(s) Infrastructure Systemsand MessagingSystems

Biggie Size Immediate Real-Time Business-Critical

Systems$$$$$$$


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Days to Weeks Recovery

Use free or low-cost solutions to backup VMsat the host level (image-level backups)

DR site is a cold site with equipmentavailable

on-demand from a vendor/co-lo companyStore images to tape/disk and rotate off-site

Will need to manually restore imagesand fix problems .

and there will be problems!


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Minutes to Hours Recovery

Use replication to provide site-to sitereplicationof VM data

These host-level replicated VM copies

are potentially inconsistentCan use SAN-based or host-based replicationCost / Bandwidth trade-off

Less impact to WAN changes being sent in

real-time (compression/throttling)Will need to attach replicated VMs toreplacement equipment and fix problems


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Immediate Recovery

Warm or hot site is used for DRStorage to storage replication installedbetween sites

3rd party replication technologies used

for VM replicationin the guest for transactional integrity

on the host for all other workloads

Restoration is usually automated using

3rd party tools or interoperability withWindows Server Failover Clustering


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Windows Server 2008 -WSFCNo More Single-Subnet Limitation

Allows cluster nodes to communicateacross network routers

No more having to connect nodes with

VLANs!Configurable Heartbeat Timeouts

Increase to extend geographically

dispersed clusters over greater distancesStorage Vendor Based SolutionMirrored storage between stretchedlocations

Hardware or Software based replication


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GeoCluster

Integrates with Microsoft Failover ClusteringUses Double-Take Patented Replication

Extends Clusters Across GeographicalDistances

Eliminates Single Point of Disk Failure

GeoCluster for Hyper-V WorkloadsUtilizes GeoCluster technology to extend Hyper-Vclustering across virtual hosts without the use ofshared disk

Allows manual and automatic moves of clusterresources between virtual hosts


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G e o C lu ste r n o d e s u se sep a ra te, -d isks kep t syn ch ro n ized b y re a l

tim e re p lica tio n

Only theactive nodeaccesses its

disks

,At failoverthe new activenode resumes

,with currentreplicated

data

Data is replicatedto all passive

nodesReplicatio

n

How GC Integrates w/WSFC


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-Multi site stretch configurations can-Multi site stretch configurations can- provide automatic fail over- provide automatic fail over

econdary Siteecondary Siterimary Siterimary Site

SANAN SA NANeplicated data from site A

toragetorageArrayrray toragetorageArrayrray

Geographically distributed clusters are extendGeographically distributed clusters are extendto differentto different

physical locationsphysical locations Stretch clustering uses the same concept as loStretch clustering uses the same concept as lo

site clusteringsite clustering Storage array or third party software providesStorage array or third party software provides

ch Clustering automatically fails VMs over to a geographically different site

rimary site data is replicated to the secondary site

Microsoft Stretch Clustering& Storage Continuity


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-Software based Quick/ -Migration Geo clustering for

-Hyper V VMs

emo


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. . /www microsoft com teched

- &Sessions On Demand Community

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. . /www microsoft com learningMicrosoft Certification and Training

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&Microsoft Certification TrainingResources

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- ( )ands on Labs session codes and titles( )ands on Labs session codes and titlesV IR 0 4V IR 0 4 : -HOL Introduction to Hyper V: -HOL Introduction to Hyper V


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Windows Server Resources Make sure you pick upMake sure you pick up

your copy of Windowsyour copy of WindowsServer 2008 R2 RC fromServer 2008 R2 RC from

the Materialsthe MaterialsDistribution CounterDistribution Counter

:Learn More about Windows Server 2008 R2:Learn More about Windows Server 2008 R2 . . /www microsoft com WindowsServer2008R2. . /www microsoft com WindowsServer2008R2

(Technical Learning Center Orange(Technical Learning Center Orange):Section):Section

Highlighting Windows Server 2008 and R2 technologiesHighlighting Windows Server 2008 and R2 technologies Over 15 booths and experts from Microsoft and ourOver 15 booths and experts from Microsoft and our

partnerspartners
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.The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation Because Microsoft must respond, ,to changing market conditions it should not be interpreted to be a commitment on the part of Microsoft and Microsoft cannot guarantee the accuracy of any information provided after

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High Availability and Disaster Recovery Considerations for Hyper-V

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