whats new vmware vcenter site recovery manager 50 technical whitepaper
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Whats New in VMwarevCenter Site Recovery
Manager 5.0T E C H N I C A L W H I T E P A P E R
V 1 . 0 / U P D A T E D M A Y 2 0 1 1
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Whats New in VMware vCenterSite Recovery Manager 5.0
T E C H N I C A L W H I T E P A P E R / 2
Table of Contents
Introduction 3Technology Changes And New Features 4
vSphere Replication 4
Site Recovery Manager Scalability 5
Workfow Changes 6
Planned Migration 6
Reprotection 7
Failback 8
Disaster Recovery Event 8
User Interace 9
Technical Improvements 10
IPv6 10
Single UI 10
IP Customization Enhancements 10
In-Guest Callouts 10
API 10
Virtual Machine Dependency Enhancements 11
Conclusion 13
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Whats New in VMware vCenterSite Recovery Manager 5.0
IntroductionVMware vCenter Site Recovery Manager (Site Recovery Manager) is the premier tool to enable you to build,
manage and execute reliable disaster recovery plans or your virtual environment. Taking ull advantage o theencapsulation and isolation o virtual machines, Site Recovery Manager enables simplied automation o disaster
recovery. It helps meet recovery time objectives, reduces costs traditionally associated with business
continuance plans and achieves low-risk and predictable results or recovery o a virtual environment.
With the new version 5.0 release, VMware has expanded the capabilities o Site Recovery Manager to provide
unprecedented levels o protection. New use cases have been made possible through the addition o the
ollowing capabilities:
vSphereReplication
Increasedscalability
Plannedmigration
Failback
Reprotection
Enhanceddependencydenition
In this paper, we will provide an overview o the new capabilities o Site Recovery Manager 5.0.
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Whats New in VMware vCenterSite Recovery Manager 5.0
Technology Changes and New Features
vSphere ReplicationWhen used in conjunction with VMware vSphere 5.0 (vSphere), Site Recovery Manager 5.0 introduces a new
capability to utilize the vSphere 5.0 host to perorm replication o powered-on virtual machines over the
network to another vSphere 5.0 host without the requirement o storage arraybased native replication.
vSphere Replication is a VMware proprietary replication engine that copies only changed blocks to the recovery
site, ensuring both lower bandwidth utilization and more aggressive recovery point objectives compared with
manual, ull-system copies o virtual machines.
Figure 1.vSphereReplicationEnablesVirtualMachinestoBeReplicatedbythevSphereHosttoaRecoverySiteWithouttheNeedorArray-BasedReplication
This new capability unlocks the capacity to use Site Recovery Manager or unprecedented levels o protection,
enabling ull replication o the entire set o virtual machines in the vSphere environment while maintaining ull
interoperability with array-based replication engines.
vSphere Replication can be enabled through Site Recovery Manager as a property o the virtual machine itsel,
independent o the underlying datastore type or capabilities, acilitating replication between heterogeneous
storage types and datastores.
vSphere Replication with Site Recovery Manager includes the ollowing eatures:
Guestoperatingsystem(OS)MicrosoftVolumeShadowCopyService(VSS)integrationtoensureOSle
system consistency o the replica
Paralleloperationwitharray-basedreplicationviastoragereplicationadaptorstoenabletieredreplication
oerings
Norequirementforchangetoexistingworkowsorreplicationtechnologies
Abilitytoremapprotectedsitevirtualmachinediskstoalternatedatastoresattherecoverysite
Granularcongurationofreplicationchooseallorasubsetofarunningvirtualmachinesdiskstoreplicateto
the recovery site using vSphere Replication
Theabilitytochooseindividualvirtualmachinediskles,entirevirtualmachinesorgroupsofvirtualmachines
to protect through a graphical user interace
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Whats New in VMware vCenterSite Recovery Manager 5.0
Figure 2.vSphereReplicationCanBeAccessedThroughtheSameUserInteraceAsAllOthervSphereManagementCapabilities
Site Recovery Manager Scalability
Site Recovery Manager 5.0 has introduced some changes to the scalability limits o previous versions, oering a
largerceilingofprotectedsystemsperinstance,asdetailedinTable1.Althoughmanyoftheselimitsarenotenforced,
they should be adhered to because support cannot be guaranteed i these numbers are exceeded in practice.
FEATURE MAXIMUM ENFORCED
Total number o allowed protected virtual machines 1,000 No
Number o allowed virtual machines in a single protection group 500 No
Protectiongroups 250 No
Simultaneous running recovery plans 30 No
vSphere Replication protected virtual machines 500 No
Table 1.SiteRecoveryManager5ScalabilityLimits
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Whats New in VMware vCenterSite Recovery Manager 5.0
Workfow ChangesSiteRecoveryManager5.0includesthreemajoradditionstotheworkowcapabilities:
Plannedmigration
Reprotection
Failback
Planned Migration
PriortoSiteRecoveryManager5.0,workowcapabilitiesincludedbothexecutionandtestingofarecovery
plan.Withversion5.0,VMwarehasintroducedanewworkowdesignedtodelivermigrationfromaprotected
sitetoarecoverysitethroughexecutionofaplannedmigrationworkow.Plannedmigrationensuresanorderly
and pretested transition rom a protected site to a recovery site while minimizing the risk o data loss .
Plannedmigrationrunsinahighlycontrolledfashion.Itwillhalttheworkowifanerroroccurs,whichdiers
rom a traditional disaster-event recovery plan.
With Site Recovery Manager 5.0, all recovery plans, whether they are or migration or recovery, run as part o a
plannedworkowthatensuresthatsystemsareproperlyshutdownandthatdataissynchronizedwiththe
recovery site prior to migration o the workloads. This ensures that systems are properly quiesced and that all
data changes have been completely replicated prior to starting the virtual machines at the recovery site. I,
however,anerrorisencounteredduringtherecoveryplanexecution,Plannedmigrationwillstoptheworkow,
providing an opportunity to x the problem that caused the error beore attempting to continue.
Figure 3.
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Whats New in VMware vCenterSite Recovery Manager 5.0
With planned migration, systems are application consistent when started at the recovery site, rather than le-
system consistent as is seen when systems are started ater a crash. This enables new uses o Site Recovery
Manager,includingworkowssuchasthefollowing:
Coordinatedapplicationmigrationbetweensites
Partialsitemigration
Datacenterrelocation
Disasteravoidance
Reprotection
Afterarecoveryplanorplannedmigrationhasrun,thereareoftencaseswheretheenvironmentmustcontinue
to be protected against ailure, to ensure its resilience or to meet objectives or disaster recovery.
With Site Recovery Manager 5.0, reprotection is a new extension to recovery plans or use only with array-based
replication. It enables the environment at the recovery site to establish synchronized replication and protection
o the environment back to the original protected site.
VM VM VM VM VM VM VM VM
Site A
VMware ESX VMware ESX
Site B
Reverse
Replication
Figure 4.
Afterfailovertotherecoverysite,selectingtoreprotecttheenvironmentwillestablishsynchronizationand
attempt to replicate data between the protection groups now running at the recovery site and the previouslyprotected, primary site.
This capability to reprotect an environment ensures that environments are protected against ailure even ater a
site recovery scenario as well as enabling automated ailback to a primary site ollowing a migration or ailover.
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Whats New in VMware vCenterSite Recovery Manager 5.0
Figure 5.
Failback
Anautomatedfailbackworkowcanberuntoreturntheentireenvironmenttotheprimarysitefromthe
secondary site. This will happen ater reprotection has ensured that data replication and synchronization have
been established to the original site.
Failbackwillrunthesameworkowthatwasusedtomigratetheenvironmenttotheprotectedsite.Itwill
guarantee that the critical systems encapsulated by the recovery plan are returned to their original environment.
Theworkowwillexecuteonlyifreprotectionhassuccessfullycompleted.Failbackisnotavailableforusewith
vSphere Replicationprotected virtual machines.
Failbackensuresthefollowing:
Allvirtualmachinesthatwereinitiallymigratedtotherecoverysitewillbemovedbacktotheprimarysite.
Environmentsthatrequirethatdisasterrecoverytestingbedonewithliveenvironmentswithgenuine
migrations can be returned to their initial site.
Simpliedrecoveryprocesseswillenableareturntostandardoperationsafterafailure.
Failovercanbedoneincaseofdisasterorincaseofplannedmigration.
Disaster Recovery Event
Aspreviouslynoted,allrecoveryplansinSiteRecoveryManager5.0nowincludeaninitialattemptto
synchronize data between the protection and recovery sites, even during a disaster recovery scenario.
Duringadisasterrecoveryevent,aninitialattemptwillbemadetoshutdowntheprotectiongroupsvirtual
machines and establish a nal synchronization between sites. This is designed to ensure that virtual machinesare static and quiescent beore running the recovery plan, to minimize data loss where possible during a disaster.
I the protected site no longer is available, the recovery plan will continue to execute and will run to completion
even i errors are encountered.
This new attribute minimizes the possibility o data loss while still enabling disaster recovery to continue, balancing
the requirement or virtual machine consistency with the ability to achieve aggressive recovery-point objectives.
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Whats New in VMware vCenterSite Recovery Manager 5.0
User InteraceThe user interace or Site Recovery Manager 5.0 has been signicantly redesigned to deliver easier and more
efcient administration. It also includes numerous enhancements or reporting.
Figure 6
The ollowing are among the changes:
BothprotectedandrecoverysiteVMwarevCenterServerandSiteRecoveryManagerinformationisvisible
without the requirement or linked mode.
Enhancedinformationisavailableaboutarraysandarraymanagers.
VirtualmachineIPsettingsarevisibleandeditablethroughtheuserinterface,enablingIPcustomizationtobe
specied when running in protected or recovery sites.
Newiconsforshadowvirtualmachineseasilydistinguishrealvirtualmachinesfromshadowvirtualmachines.
Enhancedreporting,includingstartedbyinformation,isinthesummarysectionofrecoveryplanreports.
Moredetailedinformationisincludedinreports,suchasdatastoreanddevice-specicndings.
Figure 7.
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Whats New in VMware vCenterSite Recovery Manager 5.0
Technical ImprovementsAnumberofchangesfocusedonimprovingtheintegrationandmanageabilityoftheproducthavebeen
included in the Site Recovery Manager 5.0 release.
IPv6
SiteRecoveryManagernowsupportsIPv6forallnetworklinks.
Single UI
BothprotectedandrecoverysiteinstallationsofSiteRecoveryManagerarevisibleandmanageablethrougha
single Site Recovery Manager interace. Regardless o which site a user is logged in to, both sites are visible and
all management tasks are available or the administrator. This eliminates the need to manage the protected and
the recovery site through separate interaces.
VMware vCenter Servers are not required to be installed in Linked Mode or this unctionality because the Site
Recovery Manager instances communicate directly with each other to share management inormation andpresent it through a single user interace. Linked Mode is still recommended, however, to ensure that license,
permission and state inormation about the environment is correctly shared between VMware vCenter Server
instances and to ease administration o the virtual environment.
IP Customization Enhancements
IPcustomizationhasbeendramaticallyimprovedintermsofspeedofexecution.Itcannowbespeciedwithin
the properties o individual virtual machines within Site Recovery Manager. The process or bulk imports has not
changed.Thedramaticimprovement,however,inthespeedoftheIPcustomizationexecutionitselfwillspeed
the process o recovery, enabling a aster recovery time.
In-Guest Callouts
Site Recovery Manager has traditionally enabled script callouts to be run rom a recovery plan to execute customactions. With Site Recovery Manager 5.0, VMware has enhanced this capability, enabling scripts to be run rom a
location on the Site Recovery Manager server itsel as well as running custom script callouts to locations that
reside within individual virtual machines.
Callout capabilities now include the ollowing:
Commandscanberunontherecoveredvirtualmachine.
CommandscanberunontheSiteRecoveryManagerserver.
Auser-promptpop-uprequiresuserinteractionbeforecontinuation.
Atimeoutpolicycanbeattachedtothecallouttoensurethatautomatedrecoveryiscontinued.
API
TheAPIforautomationofSiteRecoveryManageractivitiesattherecoverysitehasbeenpreservedwiththe
movetoversion5.0.IthasbeenfurtherenhancedwiththeadditionofanewSOAP-basedAPIthatenables
automation o tasks at both the protected and the recovery site.
Theprotected-siteAPIincludesthefollowingcapabilities:
Listreplicateddatastores,protectiongroups,resourcesandvirtualmachines.
Querythestatusofprotectionforoneormorevirtualmachines.
Protectorunprotectoneormorevirtualmachines.
Querythestatusofaprotectiongroup.
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Whats New in VMware vCenterSite Recovery Manager 5.0
Therecovery-siteAPIincludesthefollowingcapabilities:
Queryrecoveryplaninformation.
Startorcancelarecoveryplan.
Listoranswerprompts.
PresentanXMLrepresentationofahistoricalrunofarecoveryplan.
Retrievebasicresultinformationofarecoveryplan.
Virtual Machine Dependency Enhancements
Site Recovery Manager 5.0 enables users to manage multitier applications and virtual machine dependencies at
an enhanced level o control, with the addition o more priority groups and the ability to set virtual machine
dependencies within a priority group.
With previous releases o Site Recovery Manager, priority groups were described as high, medium or low priority.
Inversion5.0,thishaschangedwithanexpansiontoveprioritygroups,labelednumerically.Prioritygroup1
will start rst, and all virtual machines in the priority group must start beore priority group 2 virtual machines
begin their power operations. This process continues until virtual machines in group 5 have completely started.
Figure 8.
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Whats New in VMware vCenterSite Recovery Manager 5.0
Within each priority group, virtual machine dependencies can be dened so as to be certain that required
systems are available rst, beore dependent virtual machines are powered on.
The combination o priority groups and virtual machine dependency denitions within the priority groups
enableshighlyorganizedworkowcontrol,ensuringthatrequiredservicesareavailablebeforesubsequentvirtual machines are powered on.
Figure 9.
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Whats New in VMware vCenterSite Recovery Manager 5.0
ConclusionVMware vCenter Site Recovery Manager 5.0 has introduced a set o enhancements and eatures that enable new
levels o control and protection, ranging rom a dramatic user interace change to the ability to use a new nativeVMwareESXi5.0replicationengine.
The ollowing are among the signicant improvements in Site Recovery Manager 5.0 over 4.1:
Acompletelynewuserinterfaceincludestheabilitytomanagebothprotectedandrecoverysitesfromone
interace, as well as more intuitive graphical representations o protected objects.
Anewworkowenablesplannedmigrationofprotectiongroupsfromonesitetoanotherwithoutdataloss.
Failoverwillstopiferrorsareencountered.
Thereisnowtheabilitytoreprotectarecoverysiteafterfailoverormigrationandtoautomatethefailback
process or all virtual machines that have relocated.
TheenablingofvSphereReplicationoersanewhost-basedprotectionofvirtualmachines,independentof
array replication technologies.
ThereisnowafasterrecoverytimeifIPcustomizationisrequiredattherecoverysite.
Thereisnowthecapabilitytoruncalloutscriptsfromwithinprotectedvirtualmachinesduringafailover.
Thereisnowthecapabilitytomanagethestartupofvirtualmachinesatamoregranularlevelaswellasto
manage their dependent relationships.
These new eatures establish VMware vCenter Site Recovery Manager 5.0 as the preeminent technology or the
protection and recovery o a virtual environment. Using it enables aggressive recovery time objectives through
easy testing and rapid automation o recovery plans while it helps you eliminate the complexity o managing
disaster recovery. VMware vCenter Site Recovery Manager removes the risk and worry rom disaster recovery.
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