HDR ProtectingCitrixXenServer Scout

7/27/2019 HDR ProtectingCitrixXenServer Scout

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Protecting Citrix XenServer Using HitachiDynamic Replicator - Scout

MK-98DF8221-00


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Copyright 2009 Hitachi, Ltd., Hitachi Data SystemsCorporation, ALL RIGHTS RESERVED

Notice: No part of this publication may be reproduced ortransmitted in any form or by any means, electronic or

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Hitachi, Ltd. and Hitachi Data Systems reserve the right tomake changes to this document at any time without noticeand assume no responsibility for its use. Hitachi, Ltd. andHitachi Data Systems products and services can only beordered under the terms and conditions of Hitachi DataSystems applicable agreements. All of the featuresdescribed in this document may not be currently available.Refer to the most recent product announcement or contact

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This document contains the most current informationavailable at the time of publication. When new and/orrevised information becomes available, this entire documentwill be updated and distributed to all registered users.

Hitachi is a registered trademark of Hitachi, Ltd. in theUnited States and other countries. Hitachi Data Systems is aregistered trademark and service mark of Hitachi, Ltd. in theUnited States and other countries.

All other trademarks, service marks, and company names in

this document are properties of their respective owners.


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Contents

1 Howthissolutionworks................................................................................................................... 62 Checklist.............................................................................................................................................. 7Part1:BackingupthroughLVreplicationapproach........................................................................... 83

Introduction

to

solution .................................................................................................................... 9

4 Prepare................................................................................................................................................ 104.1 Identifylogicalvolumestobereplicated.............................................................................. 104.2 Recreateguestmachinesonthetarget................................................................................. 12

CreatingWindowvirtualmachine.................................................................................................. 12CreatingLinuxvirtualmachine....................................................................................................... 16

4.3 InstallDRScout........................................................................................................................ 225 Protect ................................................................................................................................................. 22

5.1 Replicatesourcevirtualmachines ......................................................................................... 225.2 Shutdowntargetvirtualmachines ........................................................................................ 255.3 Monitorreplicationpair.......................................................................................................... 265.4 Consistencytags ....................................................................................................................... 27

6 Failover............................................................................................................................................... 296.1 Differencesbetweenrollbackandsnapshot......................................................................... 296.2 Rollbackapproach.................................................................................................................... 306.3 Bringtargetvirtualmachinesonline..................................................................................... 326.4 Snapshotapproach................................................................................................................... 33

Prepareforthesnapshot................................................................................................................... 33Createasnapshot............................................................................................................................... 34Swapdevice........................................................................................................................................ 36Starttheguestmachine..................................................................................................................... 37

7 Failback .............................................................................................................................................. 387.1 Reversereplication................................................................................................................... 387.2 Consistencytag......................................................................................................................... 397.3 Rollback..................................................................................................................................... 397.4 Starttheguestmachine ........................................................................................................... 40

Part2:BackingupthroughSRapproach ............................................................................................. 418 Introductiontothesolution............................................................................................................ 429 Prepare................................................................................................................................................ 42

9.1 Cleanup ..................................................................................................................................... 439.2 Discovery................................................................................................................................... 45

10 Protect ............................................................................................................................................ 4810.1 VXreplication........................................................................................................................... 4810.2 Consistency............................................................................................................................... 51

11

Recovery........................................................................................................................................ 52

11.1 Rollback..................................................................................................................................... 5211.2 RestoreVMs.............................................................................................................................. 53

12 Failback ......................................................................................................................................... 5512.1 Reversereplication................................................................................................................... 5512.2 Consistencytag......................................................................................................................... 5612.3 Rollback..................................................................................................................................... 5612.4 Starttheguestmachine ........................................................................................................... 56

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4

Part3:BackingupXenServerresourcepoolthroughLVreplication ............................................. 5713 Introductiontothesolution....................................................................................................... 5814 Prepare........................................................................................................................................... 6015 Protect ............................................................................................................................................ 60

15.1 Setreplicationpairs ................................................................................................................. 6015.2 Consistencytags ....................................................................................................................... 65

16 Recover .......................................................................................................................................... 66Part4: PoolPoolLVSolution .......................................................................................................... 6817 Introductiontothesolution....................................................................................................... 6918 Prepare........................................................................................................................................... 7019 Protect ............................................................................................................................................ 71

19.1 Setreplicationpairs ................................................................................................................. 7119.2 Consistencytags ....................................................................................................................... 75

20 Failover.......................................................................................................................................... 7620.1 Rollbackapproach.................................................................................................................... 7620.2 SnapshotApproach.................................................................................................................. 78

20.2.1 Prepareforsnapshot ....................................................................................................... 7820.2.2 Performsnapshot ............................................................................................................ 79

21 Failback ......................................................................................................................................... 8121.1 Rollbackapproach.................................................................................................................... 81

Reversereplication............................................................................................................................ 81Consistencytag .................................................................................................................................. 81Rollback............................................................................................................................................... 81Starttheguestmachine..................................................................................................................... 81

21.2 Snapshotapproach................................................................................................................... 82Reversereplication............................................................................................................................ 82Consistencytag .................................................................................................................................. 82Snapshot.............................................................................................................................................. 82Start

the

guest

machine..................................................................................................................... 82Part5:ProtectingXenServerPool:Mastertargetguestapproach.................................................... 83

22 Introduction.................................................................................................................................. 8423 Prepare........................................................................................................................................... 8524 Protect ............................................................................................................................................ 86

24.1 Setreplicationpairs ................................................................................................................. 8624.2 Issueconsistencytags .............................................................................................................. 90

25 Recover .......................................................................................................................................... 9125.1 Addadisktocontainthesnapshot ....................................................................................... 9125.2 CreateaSnapshot..................................................................................................................... 9225.3 Detachsnapshotdiskfrommasterguestmachine.............................................................. 9425.4

Attach

the

Snapshot

disk

to

another

Guest .......................................................................... 95


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Conventions

Keywords,commandbuttonsandothersuchfieldsareenclosedinwhilebeingbold(for

example,todenote Nextisused).

Inputsfor

commands

and

Variables

are

shown

in

Italics

Filenamesandpathsareshowninbold

CommandsareshowninCourier new font

Optionalkeywordsandargumentsareenclosedwithin[].

Notes:

Containssuggestionsortips.

Caution:

Containscriticalinformation

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1 Howthissolutionworks

This document contains two major parts; the first part explains the LVbased solution, where

individual volumes arebacked up to the target Citrix XenServer. The second part explains

backingupwholediskstothetargetCitrixXenServer.

Inbothparts,thesourceCitrixXenServerispreparedbeforebeingbackeduptothetargetCitrix

XenServer through a VX replication, while the target virtual machines are powered down.

ConsistencymarkersareissuedthroughthevirtualmachineswhichgothroughthesourceCitrix

XenServertoreachthetargetCitrixXenServer.

Figure1

RecoveringtheVMsonCitrixXenServermaybeperformedintwoways;thefirst istorollback

the VMs virtual disks at the target Citrix XenServer to a consistent point and start using the

targetvirtualmachines.ThesecondapproachistotakeasnapshotofthevirtualdisksoftheVMs

andbootthevirtualmachinesoverthesnapshotvolume.

Refertothechecklistinthenextsectionbeforedeployingthesolution.

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2 Checklist

EnsureVXagentsareinstalledonboththeCitrixXenServers InstallCXserverwithinthesameLANasofthesourceCitrixXenServer PointallVXagentstothesameCXserverandassignappropriatelicenses Ensurethat/etc/hostsontheCitrixXenServercontainstheCitrixXenServersIPaddress

andhostname.ThisstepisapplicableforbothsourceandtargetCitrixXenServers.

DisablethefirewallonbothsourceandtargetCitrixXenServersthroughsystemconfigsecurityleveltuiinterface.

TargetCitrixXenServershouldhaveallthenetworksexistingatsourceandbeingusedbytheVMsonthesourceCitrixXenServers.

Editthefile/etc/sysconfig/xapitosetthebasememorywhichistheminimumpossibleallocatedtodom0bysettingthevalueofXAPI_DOM0_MEM_BASE.Thisrequiresareboot

forthenewsettingtotakeeffect.Forexample, XAPI_DOM0_MEM_BASE=752

Notes:

Ifnotexistingalready,createnetworksatthetargetCitrixXenServerhostwiththesame

name_labelofthenetworksatsourceCitrixXenServerhost

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Part1:

Backing

up

through

LV

replication

approach

ThispartexplainsprotectingCitrixXenServerbybackinguplogicalvolumes. Theprepare

sectionisdividedintosubsections,combinedtogethertheyexplainidentifyingthevolumesthat

aretobereplicated,creatingguestmachinestructureonthetargetCitrixXenServerandwhereto

installDRScout.Theprotectsectionexplainssettingreplicationpairs,issuingconsistencytags

andmonitoringreplicationpairs.

Thefailoversectionisbranchedintotwo,thefirstbeingarollbackapproachandthesecond

beingasnapshot

approach.

Finally

afailback

is

described

in

detail.

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3 Introductiontosolution

This solution document describes how tobackup/restore a Citrix XenServer to another Citrix

XenServer.TheproductionCitrixserverwillbereferredtoasthesourceCitrixXenServerandthe

DRCitrixXenserverwillbereferredtoasatargetCitrixXenServer.

Thesolutionisdividedintothreesteps,i.e.

Prepare

ThissectionincludesinstallingtheCXserverandVXagentsonbothsourceandtargetCitrix

XenServers.Thencreatetheguestmachinesontargetthatcorrespondtothesourceguest

machineswiththesamedisksize.

Figure2

Protect

Oncetheguestmachinesarecreatedonthetargetshutdowntheguestmachinesandproceedto

setreplication

pair(s)

from

source

Citrix

XenServer

to

target

Citrix

XenServer.

Set

aconsistency

jobtoissueconsistencytagsonthesourcevolume(s)atregularintervals.

Recover

StopthesourceguestmachinesandrollbackthetargetvolumeseitherthroughtheCXUIor

throughCLI.Thenstartthetargetguestmachines.

Caution:

ThissolutionisforvirtualmachinesbasedonLVMs.

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4 Prepare

4.1 Identifylogicalvolumestobereplicated

Step1. Inthisstep,allthelogicalvolumesbelongingtotheirrespectivevirtualmachinesare

identifiedthroughtwocommands

AccessthesourceCitrixXenServerscommandprompttoissuethefollowingcommand

xe vm-disk-list multiple

Theabovecommand:

DisplaysthevirtualmachinesandtheircorrespondingVBDsandVDIsonthehost ExtracstheuuidofVDIofaVM

Figure3

Notes:

Theuuidofthevirtualmachinethatistobereplicated

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Step2. Oncethecommandiscomplete,proceedtoissuethefollowingcommandonthesource

CitrixXenServerscommandprompt.

lvdisplay

Thisdisplaysalltheavailablelogicalvolumesonthehost Identifythelogicalvolumewiththesameuuidasofthevirtualmachinethatistobe

protected.

Figure4

Aftertheabovetwocommand,youwillbeabletomapvirtualmachineswiththeirrespective

logicalvolumes.

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4.2 Recreateguestmachinesonthetarget

OpentheXenCenterinterface,thencreatetheguestmachinesonthetargetcitrixXenServerwith

the

same

configuration,

operating

system

and

disk

size.

Creating

Windows

and

Linux

virtual

machinesareslightlydifferent,howeverbothproceduresaredescribedbelow.

CreatingWindowvirtualmachine

Step1. OpentheXenCenterthenselectthetargetCitrixXenServerandclickonNewVM.This

willcreateanewvirtualmachineonthetargetCitrixXenServer.

Figure5

Step2. Thewizardfollows,selectthesametemplateasoftheproductionguest,andthenclick

onNext.

Figure6

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Step3. EntertheNameandDescriptionoftheguestmachineandthenclickonNextto

continue.

Figure7

Step4. YoumaychoosetoloadabootableCDintotheCDdriveorenterthepathofabootable

ISOimage.ThenclickonNext.

Figure8

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Step5. EnterthenumberofvirtualCPUsandphysicalmemoryandthenclickonNext.

Figure9

Step6. Thenextscreenopensup,ensurethatyouaddadiskofsimilarorlargersizeasofthe

sourceguestmachine,thenclickonNext

Figure10

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Step7. ThroughthisscreenyoucanaddadesirednumberofvirtualNICs.Createthevirtual

interfacessuchthattheconfigurationreflectsthatofthesourceVM.ClickonNextto

proceed

Figure11

Step8. ClickonFinishandthevirtualmachinestarts.

Figure12

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16

CreatingLinuxvirtualmachine

Step1.

A

new

New

Storage

is

created

to

load

aboot

image.

Select

the

target

Citrix

Xenserver

thenclickonNewstorage.

Figure13

Step2. YoumaychooseanyofthedesiredoptionthenclickonNext.(Forthisexample

however,weselectwindowsfilesharing)

Figure14


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Step3. EntertheNameandPathandthenenterthefullusernameandpasswordtoaccess

theenteredpath.ClickonFinishtocompleteaddinganewstorage.

Figure15

Step4. ThenewstoragenowappearsunderthetargetCitrixXenServer.ClickonNewVMto

createanewLinuxguestmachineonthetargetCitrixXenServer.

Figure16

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Step5. Thetemplatescreenopensup,selectthedesiredLinuxtemplate,andclickonNext.

Forthisexampleweselecta64birRHEL5operatingsystem.Ensurethatyouselectthesame

templateasoftheproductionguestmachine.

Figure17

Step6. EnterthenameofthenewvirtualmachineanddescriptionandthenclickonNext.

Figure18

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Step7. Selectthedesiredoption(aURL,CDdriveorISOimagepath). Enteringboot

parametersisoptional.ClickonNexttoproceed.

Figure19

Step8. EnterthenumberofvirtualCPUsandphysicalmemoryandthenclickonNext

Figure20

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Step9. Thenextscreenopensup,ensurethatyouaddadiskofthesamesizeasofthesource

guestmachineandthenclickonNext.

Figure21

Step10. ThroughthisscreenyoucanaddadesirednumberofvirtualNICs.Createthe

virtualinterfacessuchthattheconfigurationreflectsthatofthesourceVM.ClickonNext

toproceed.

Figure22

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Step11. ClickonFinishtostartthevirtualmachine.

Figure23

Step12. Themachinebootsupasshowninthepicturebelow

Figure24

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4.3 InstallDRScout

PleaserefertotheinstallationguideforinstallingandconfiguringCXserverandVXagents.

TheVXagentsaretobeinstalledonthesourceandtargetCitrixXenServers.

5 Protect

5.1 Replicatesourcevirtualmachines

Settingavolumereplicationisperformedinfourstepsasshowninthepicturebelow.

Figure25

Step1. OpentheCXUIandclickonVolumeProtection,thenexpandthesourceCitrix

XenServertoselectthesourcevolumecorrespondingtothesourceguestmachinethatistobe

protectedandclickonStartReplication

Figure26

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Step2. Thenextscreenopensup.ExpandthetargetCitrixXenServertoselecttherespective

targetvolume.Thenscrolldowntosetthereplicationoptions.

Figure27

Step3. AlltheprocessserverspointedtotheCXserverarelistedhere.Youmaychooseadesired

processserverwhichwillhandlealltheoffloadactivitiesspecifictothisreplicationpairs. For

betterscalabilityyoumaypointmoreprocessserverstotheCXserver. Selecttheprocess

serverandscrolldowntosettheReplicationOptions

Figure28

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Step4. EnabletheMediaRetentionandclickonSubmitandtherestareoptional.

Figure29

Step5. Thenextscreenopensup,choosethedesiredretentionpolicy,andclickonSubmitto

startthereplicationpair

Figure30

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Notes:

Repeatabovestepstoprotectanyadditionalguestmachines

SettingthereplicationpairissimilarforwindowsandLinuxplatforms.

5.2 Shutdowntargetvirtualmachines

Beforesettingthereplicationpairsshutdowntargetvirtualmachines.

Step1. ShutdowntheWindowstargetvirtualmachine(s)asshownbelow.

Figure31

Step2.

Similarly,

shutdown

the

Linux

target

virtual

machine(s)

Figure32

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26

AftershuttingdowntheVMensurethatalltheprotectedlogicalvolumes(correspondingtothe

virtualdisksoftheVMthatwasshutdown)areavailableornot.Ifanyprotectedlogicalvolume

isnotavailable,runlvchangeaytomakethelogicalvolumeavailable.

5.3 Monitor

replication

pair

InthisClickonProtectionStatustomonitorthereplicationstatus.Observethattherearetwo

replicationpairs,oneforwindows,andtheotherforLinuxvirtualmachines.

Figure33

Notes:

Youmaychoosetosetemailalertsortraps.PleaserefertotheAdminguide.pdffordetailed

description.


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5.4 Consistencytags

Step1. OncethereplicationpairreachesDifferentialSync,proceedtoissueconsistencytags

on

the

source

volume.

Consistency

tags

are

issued

on

the

source

virtual

machine,

Access

the

CXUIthroughthesourcevirtualmachinetodownloadthevacpclient.Downloadthe

appropriatevacpclientthroughSystem>Agentinstallers.

Figure34

vacp32suse9isusedforguestmachinewith32bitplatformsofSUSE9,SLES9SP2,SLES9SP3.

Vacpx64.exeisusedfor64bitwindowsplatforms VacpIA64.exeisusedfor64bitwindowsonItaniumplatform. Vacp64isusedfortheguestmachineswithany64bitplatform Vacp.exeisusedfor32bitwindowsplatforms Vacp32isusedfor32bitLinuxplatforms

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ForaLinuxvirtualmachineusethefollowingcommand

./vacp remote v ,, -t -serverdevice , -serverip [-serverport 20003]

serverport

20003

is

an

optional

switch

Figure35

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6 Failover

6.1 Differencesbetweenrollbackandsnapshot

Thetarget

virtual

machines

may

be

recovered

either

by

rolling

back

the

target

volumes

or

by

takingasnapshotofthetargetvolumes.

Table1:Differencesbetweenrollbackandsnapshot

Snapshot Rollback

Replication Intact Breaksreplicationpair

Storage Requiresanadditionalvolumewithequal

orlargercapacityontheDRserver

Noadditionalstorage

required

Consistency Bothtagbasedandtimebased Bothtagbasedandtimebased

Asnapshotisnotdisruptivetothereplicationpairwhereasarollbackbreaksthereplicationpair.

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6.2 Rollbackapproach

Targetvolumecanberolledbackintimebasedoraneventbackintimebasedonavacptag

issuedonthesourcevolumeorbasedontime.ArollbackcanbeperformedthroughCXUIand

command

line

interface

of

the

DR

Server.

This

example

describes

to

perform

an

event

based

roll

back.

Step1. OntheCXUI,clickonRecoverythenselectthereplicationpairandclickon

Rollback.Aconfirmationmessageappears,clickonOk

Figure36

Step2. Thenextscreenopensup,toperformaneventbasedrollback,selecttheoptionUsing

Applicationconsistency&Eventbased

Figure37

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Thischangestheinterfacebelowtoasearchresultanddisplayalistofavailableconsistency

tagstowhicharollbackmaybeperformed.SelectthedesiredtagandclickonSave

Figure38

Thiswillrollbackthetargetvolumetoaconsistentpoint

Step3. ClickonRecoverytocheckthestatusoftherollback.Arollbackissimilarforwindows

replicationpairsaswell.

Figure39

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6.3 Bringtargetvirtualmachinesonline

IncaseofanunplannedfailovershutdowntheproductionCitrixXenServeroncetherollbackis

complete.Forplannedfailovershutdownthesourcevirtualmachinesthenrebootthetarget

virtualmachines(whichshouldbeinhaltedstatenow).Thetargetguestmachinesshouldcome

up

normally.

Figure40

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6.4 Snapshotapproach

Thisinvolvesfoursteps

Prepareforsnapshotdisk:Createanewdiskwithequalcapacity Createsnapshot:CreateasnapshotofthetargetvolumethroughtheCXUI Swapdevice:Swaptheoriginaldevicewiththesnapshotdevice Startguestmachine:Theguestmachineshouldbootupwiththesnapshotdisk

Figure41

Prepareforthesnapshot

Createavirtualdiskequalinsizetothatofthetargetvolume.Thisvirtualdiskisusedtocontain

thesnapshot.

xe vdi-create name-label= sr-uuid= -type= -

size=

Figure42

Oncethediskiscreated,bringthenewlycreatedvirtualdiskonlinethroughthecommandas

shownbelowlvchange ay

Figure43

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Createasnapshot

Step1. OntheCXUI,clickonRecovery,selectthereplicationpair,andclickonRecover.

Figure44

Step2. Thenextscreenopensup.SelecttheoptionUsingApplicationconsistency&Event

basedtoperformaneventbasedrecovery.

Figure45

Notes:

ToperformatimebasedrecoveryselecttheoptionUsingtime

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Step3. SelectthetagfromtheSearchResult.SelecttheDriveTypeasPhysical,select

theLVcorrespondingtothenewlycreatedvirtualdiskunderthePhysicalDrivesand

clickonSave.ReferthesectionPrepareforthesnapshotonpageStep2.33

Figure46

Step4. ClickonRecoverytomonitorthesnapshotprogress.

Figure47

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Swapdevice

Step1. Oncethesnapshotiscomplete,accesstheXenCenterinterfaceandclickonStoragetab

thenonAttach.

Figure48

Step2. SelectthenewlycreatedvirtualvolumeandclickonAttach

Figure

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Step3. Nowthatthesnapshotdiskisattached,proceedtoremovethepreviousdiskasshownin

thepicture.

Figure50

Starttheguestmachine

Step4. Thenstarttheguestmachine.Nowthemachinewillbootthroughthesnapshotdisk.

Figure51

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7 Failback

Toperformafailbackinrollbackapproach,setareversereplicationfromthetargetLVtothe

sourceLV.

Similarly,

to

perform

afailback

from

snapshot

approach

perform

areverse

replication

fromthesnapshotLVtothesourceLV.Inthisexample,weperformafailbackfromsnapshotLV.

Failbackisperformedinfoursteps

Reversereplication:Areversereplicationissettoupdatetheproductionvolumewithallthechangesoccurredduringitsoutage

Consistencytag:Consistencytagsis issuedtowhicharollbackwillbeperformed Rollback:Thetargetvolumeisrolledbacktoaconsistencytag Startguestmachine:Theguestmachineshouldbootupwiththerolledbackvolume.

Figure52

7.1 Reversereplication

Step1. SetareversereplicationfromthesnapshotLVtothesourceLVwithmediaretentionas

shownin

the

picture

below.

Figure53

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7.2 Consistencytag

Step1. OncethereplicationpairreachesDifferentialSync,accesstheguestmachinethen

navigatetotheinmageagentinstallationpathtoissueaconsistencytag

Figure54

7.3 Rollback

Step1. Rollbackthetargetvolumebasedontheaboveissuedconsistencytag.Refertothe

sectionRollbackapproachonpage30toperformarollback.

Figure55

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7.4 Starttheguestmachine

Step1. Oncetherollbackiscomplete,accesstheXenCenterinterfacetostarttheguestmachine

Figure56

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Part

2:

Backing

up

through

SR

approach

TheSRreplication,explainstoreplicatecompletediskstothetargetCitrixXenServer.Thispart

containsthreesections

Prepare:ThepreparesectioncontainstwoFXjobsthatarerequiredbeforeproceedingwiththe

preparesection

Protect:ThissectionexplainstoreplicatessourceCitrixdiskstotargetCitrixdisks

Recover:Therecoversectionisbranchedintotwosubsections,therollbackapproachandthe

snapshotapproach.

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8 Introductiontothesolution

Toreplicatewholedisks(whichinturncontainvolumes)asvolumesfromonehosttoanother

thedrscout.conffileiseditedtoexposethedisksasvolumesontheCXUI.

Theprotectsectionexplainstoreplicateandissueconsistencytagsonthesevolumes

Figure57

Recoversectionexplainstorestorethevirtualmachinesontheproductionservertothe

correspondingDRServer.

9 Prepare

Editthefiledrscout.confundertheetcfolderofVXinstallationfolderandchangethe

ReportFullDeviceNamesOnlyfromthedefaultvalue0to1.Doingthiswillexposethefull

devicenametotheCXUI.EnsurethatyourestarttheVXagentservice

Figure58

MakesurethetargetCitrixXenServerdoesnothaveanyLVMbasedstoragerepository. Ifany

LVMbasedstoragerepositoryispresentthensetFXjobusinghard_clean_target.shas

destinationpostscript.ThiscleansuptheDRserver.Schedulethejobtorunondemand.

PleaserefertotheAdminguide.pdftosetFXjob

Notes:

TargetCitrixXenServershouldNOThaveanyLVMbasedstoragerepositoryconfiguredprior

totheprotectionofsourceCitrixXenServer.

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9.1 Cleanup

SettingupofFXjobtocleanuptheDRserverbeforeprotectingthesourceSRs

Step

1.

Select

the

DR

server

as

both

source

&

target

of

the

FX

job.

Specify

the

directory

as

/usr/local/InMage/Vx/failover_data

Figure59

Step2. Enterthepostscriptfordestinationas

/scripts/hard_clean_target.shandclickonFinish

Figure60

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Step3. SettheschedulingofthejobtoRunOnDemand.Thisjobshouldberunonlyonce

beforesettingupreplicationpairstoprotectthestoragerepositoriesoftheproductionserver.

Figure61

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9.2 Discovery

SetFXjobtorelaythemetadataoftheVMsofproductionservertotheDRServer.Use

xenserver_failover_prescript_sr.shasthesourceprescripttosettheFXjob.

Schedulethe

job

to

run

at

atime

interval

or

run

on

demand.

The

time

interval

should

be

decided

basedonthefrequencyofchangestoVMmetadata(e.g.,15minutes.).

Step1. SelecttheProductionseverassourceandDRserverasdestinationoftheFXjob.Enter

thesourceanddestinationdirectoryas/failover_dataandclickon

Next

Figure62

Step2. SelecttheCopythecontentsofthesourcedirectorydirectlyintothetargetdirectory

option asshownbelow

Figure63

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Step3. Entertheprescriptforthesourceas

/scripts/xenserver_failover_prescript_sr.shandclickonFinish

Figure64

Step4. SetthejobtoRunOnDemand.Itcanbescheduledtorunatanintervalalso.The

scheduletypehastobedecidedbasedontheprotectiontype,managedorunmanaged.For

managedprotectionRunOnDemandschedulewouldsuffice.

Figure65

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Step5. ClickonFileProtectionthenselectthejobandclickonStarttostartthejob.

Figure66

YoumaymonitorthelogfileoftheFXjob.Oncethediscoveryiscomplete,proceedtosettingup

theVXreplicationpairs.

Figure67

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10Protect

10.1VXreplication

Step1. ThenswitchtotheCXUItoreplicatethediskwhichnowappearsasavolume.Clickon

VolumeProtectionandselectthecorrespondingvolumeandclickonStartReplication

Figure68

Notes:

TargetdeviceshouldbeeitherlocaldeviceordevicebackedbyFibreChannelLUN. Failover

canrecoverthesourceSRtoSRoftypelvmorlvmohbaattarget.

Step2. Thetargetscreenappears,expandtheDRservertoselectthetargetvolume,thenscroll

downtosettheReplicationoptions

Figure69

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Step3. AlltheprocessserverspointedtotheCXserverarelistedhere,youmaychooseadesired




Figure70

Step4. DisableMediaRetentionoptionandclickonSubmit

Figure71

Step5. Oncethepairisconfigured,accesstheDRservertoedit\etc\drscout.conf. ChangetheReportFullDeviceNamesOnlyfromthedefault

value1to0.DoingthiswillstopexposingthedevicenametotheCXUI.

Figure72

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Step6. RestarttheVXagentserviceontheDRserver

Step7. AccesstheCXUIandnavigatetoVolumeProtection>Targetthenselectthepair

configuredandclickonViewDetails.ClickontheConfigureretentiontoconfigure

mediaretentionforthisreplicationpair.

Figure73

Step8. Inthenextscreenselectthetypeofretentionpolicytobeenforcedforthisreplication

pair.Youmaychoosetimebased,spacebasedoracombinationofboth.ClickonSubmit

tostartthereplicationpair

Figure74

Step9. ThereplicationpairreachesDifferentialSyncasshowninthepicturebelow

Figure75

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10.2Consistency

To

recover

individual

VM,

you

may

choose

to

execute

consistency

tags

on

the

virtual

machine

Proceedtoissueconsistencytagsthroughthevirtualmachinescommandprompt.Accessthe

sourcecommandpromptthennavigatetotheVXagentinstallationpathtoissuethefollowing

command

./vacp remote v , serverdevice ,,-serverip -t

Figure76

AtagcanbeissuesattheCitrixXenServerhostlevelalso.Usevacptoissuetagontheblock

device(s).

Optionx

has

to

be

used

along

with

option

v

to

issue

tag

without

any

consistency

mechanism.Forexample,toissuetagondismountedvolumes/rawdevices.

./vacp [-v ,..] [-t ] [-x] [-h]

Figure77

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52

11Recovery

11.1Rollback

Step1. Toperformarecovery,switchtotheCXUIandclickonRecovery,thenselectthe

replicationpair

and

click

on

Rollback.

A

confirmation

appears,

click

on

Ok

to

continue

Figure78

Step2. Thenextscreenopensup,selecttheoptionUsingApplicationconsistency&Event

based,thischangestheinterfacebelowtoSearchResultandselecttheconsistencytag

andclickonSave

Figure79

Step3. Verifyiftherollbackoftargetvolumebacktotheconsistencypointisfinished.


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11.2RestoreVMs

RunXenServerfailoverjobtorecoverthestoragerepositoriesonthereplicateddevices&the

virtualmachines.

Step1. SetupthefailoverjobwithsourceanddestinationastheDRServerwithdirectorytobe

replicatedas/failover_data

Figure80

Step2.

Enter

the

post

script

for

destination

as

/scripts/xenserver_failover_postscript_sr.shandclickonFinish

Figure81

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Step3. SetthejobtoRunondemandandclickonFinish

Figure82

Step4. ClickonFileProtectionthenselectthefailoverjobandclickStarttorecoverallthe

SRsandtorestorealltheVMstothetargetXenServerhost.

Figure83

Caution:

TheMACaddressesofthenetworkinterfaces&DHCPconfiguredIPsofthesourceVMmight

notberetainedafterfailover.

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Notes:

Incaseofanunsuccessfulfailover, run/xenserver_reset_target.sh

toresetthestatus(tostatebeforethefailoverattempt)oftargetXenServerbeforeareattempt

offailover.

Currentlywedonotsupportrecoveringvirtualmachinesthatspanacrossmultiplestorage

repositories.

12Failback

Toperformafailbackinrollbackapproach,setareversereplicationfromthetargetSRtothe

sourceSR.Similarly,toperformafailbackfromsnapshotapproach,performareversereplication

fromthesnapshotSRtothesourceSR.Inthisexample,weperformafailbackfromsnapshotSR.




Figure79

12.1Reversereplication

Step1. SetareversereplicationfromthesnapshotSRtothesourceSRwithmediaretention.The

section11.1VXReplicationcanbereferred.

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12.2Consistencytag


navigate

to

the

inmage

agent

installation

path

to

issue

a

consistency

tag.

The

section

11.2

Consistency canbereferred.

12.3Rollback



12.4Starttheguestmachine

Step4. Oncetherollbackiscomplete,accesstheXenCenterinterfacetostarttheguestmachines

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Part3:

Backing

up

XenServer

resource

pool

throughLVreplication

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13Introductiontothesolution

Thissolutiondocumentdescribeshowtobackup/restoreaXenServerpooltoanotherCitrix

XenServer.TheproductionCitrixXenServerwillbereferredtoasthesourceCitrixXenServerand

theDR

Citrix

XenServer

will

be

referred

to

as

atarget

Citrix

XenServer.

Figure84

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Prepare

ThissectionincludesinstallingtheCXserverandVXagentsontheallXenServerpoolservers

andthetargetCitrixXenServerforDR.Thencreatetheguestmachinesontargetthatcorrespond

tothesourceguestmachineswiththesamedisksize.

Figure85

Protect

Oncetheguestmachinesarecreatedonthetargetshutdowntheguestmachinesandproceedto

setthereplicationpair(s)fromsourceCitrixtotargetCitrixserver.Shutdownthetargetguest

machine(s).Setaconsistencyjobtoissueconsistencytagsonthesourcevolume(s)atregular

intervals.

Recover

Stopthe

source

guest

machines

and

rollback

the

target

volumes

either

through

the

CX

UI

or

throughCLI.Thenstartthetargetguestmachines.

Caution:

ThissolutionisforvirtualmachinesbasedonLVMs.

Ensurethatyouhaveexecuteprivilegesforvacpscripts

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14Prepare

AccessthetargetCitrixXenServerandcreatetheguestmachineswiththesamediskcapacity.

InstalltheVXagentonallpoolmembers

15Protect

15.1Setreplicationpairs

AccesstheCXUItoreplicatetheguestmachines(thesearevirtualmachinesontheproduction

CitrixXenServerpool). GuestmachinesbelongingtoapooledCitrixXenServerwillappearas

clustervolumes.

Step

1.

Click

on

Volume

protection

then

expand

the

Xen

Pools

to

find

the

cluster

group

correspondingtotheguestmachine.ClickonStartReplication

Figure86

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Step2. SelectthevolumefromthegroupandclickonNext

Figure87

Step3. Thenextscreenopensup,expandthetargetCitrixXenServertoselectthetargetvolume,

thenscrolldowntosettheReplicationOptions

Figure88

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Figure89

Step5. EnsurethattheMediaRetentionoptionisenabled,therestofthefeaturesare

optional.ClickonSubmittocontinue

Figure90

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Step6. ByenablingtheMediaRetentionoption,youwillrequiretodefinearetentionpolicy.

Selectthedesiredretentionpolicysuchastimebased,spacebasedoracombinationofboth.

ClickonSubmittocontinue

Figure91

Step7.

Select

the

replication

pair

and

click

on

Finish

to

start

the

replication

pair

Figure92

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Step8. Thiswillstartthereplicationpair.Shutdownthetargetguestmachines.Thereplication

pairwillreachDifferentialSync

Figure93

Step9. Makesure,aftershuttingdowntheVM,alltheprotectedlogicalvolumes(corresponding

tothevirtualdisksoftheVMthatwasshutdown)areavailableornot.Ifanyprotected

logicalvolumeisnotavailable,runlvchangeaytomakethelogical

volumeavailable.

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15.2Consistencytags

Accessthesourceguestmachineandissueconsistencytags.Thesetagslateractasmarkersto

whichyoumayperformarecovery.Inthisexampleconsistencytagisissuedmanually,youmay

however

choose

to

schedule

this

through

a

cron

job.

Step1. Toissueaconsistencytag,youwillneedtodownloadtheappropriatevacpscript.You

candownloadthisofftheCXUIbynavigatingtoSystem>Agentinstallers

Figure94

Step2. Ensurethatthescriptisgivenexecuteprivilegebeforeyouissuethefollowingcommand

./vacp32 v -remote serverdevice < s o u r ce v o l u m e > -t -serverip -

serverport 20003

Figure95

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66

16Recover

Torecoveryyouwillneedtorollbackthetargetvolumebacktoaconsistentpoint. Ensurethat

thesourceguestmachinesareshutdownbeforeperformingarollback.

Step1.

Click

on

Recovery

on

the

CX

UI,

select

the

replication

pair

to

be

rolled

back

and

click

onRollback.Youwillbepromptedforaconfirmation,clickonOktocontinue

Figure96

Step2. Thenextscreenappears,selecttheUsingApplicationconsistency&Eventbased

option

Figure97


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Step3. Youshouldseetheinterfacechangetothesearchresultasshownbelow.Selectthe

desiredconsistencytagtowhichthetargetvolumewillberolledbackandclickonSave

Figure98

Step4.

The

roll

back

will

soon

complete

then

proceed

to

the

next

step

Figure99

Step5. StarttheguestmachinesonthetargetCitrixXenServer,theyshouldcomeupnormally

withoutrequiringanyconfigurationchanges

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Part4: PoolPoolLVSolution

ThissolutiondocumentexplainsbackingupandrestoringanentireXenServerresourcepooltoa

DRXenServerpool.ThesourceXenServerpoolwillbereferredtoastheproductionXenServer

poolandthetargetXenServerpoolwillbereferredtoasaDRXenServerpool.

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69

17Introductiontothesolution


Prepare

ThissectionincludesinstallingtheCXserverandVXagentsontheallmembersofthe

productionaswellasDRXenServerpoolmembers.ThencreatethevirtualdisksinthetargetSR

thatareofthesamesizeasthatofthevirtualdisksoftheguestmachinestobeprotected.

Protect

Oncethevirtualdisksarecreatedonthetarget,proceedtosetthereplicationpair(s)from

productionXenServerresourcepooltocorrespondingvirtualdiskatDRXenServerresource

pool.Setconsistencyjob(s)foreachprotectedguestmachinetoissueconsistencytagsonthe

sourcevolume(s)atregularintervals.

Failover

Therearetwoapproachestoperformafailback.Therollbackapproachrequiresyoutostopthe

replicationpairandthenperformafailover.Thesnapshotapproachontheotherhandisnon

disruptiveandpreferredwhentestingthesolution.

Failback

WhentheproductionXenServerisbackonlineandreadytoresumeitsrole,afailbackis

performedtoupdatetheproductionXenServerwithallthechangesoccurredduringitsoutage.

Thisissimilartothatofaplannedfailover.

Caution:

DonotassociatethevirtualdiskscreatedinthetargetSRwithanyoftheVMsaslongasthe

replicationpairisalive.

Ensurethatyouhaveexecuteprivilegesforvacpscripts.


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18Prepare

ThissectionincludesinstallingtheCXserverandVXagentsontheallmembersofthe

productionaswellasDRXenServerpoolmembers.

Createthe

virtual

disks,

within

shared

SR

of

DR

XenServer

resource

pool,

that

are

of

the

same

sizeasthevirtualdisksoftheguestmachinestobeprotected.

Figure100

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19Protect


Step1. SwitchtotheDRXenServerpooltoidentifythelogicalvolumethatcorrespondstothe

newlycreatedvirtualdiskthenrunthecommandlvchange -ay ona

poolmemberthatactsastargetforthereplicationpair.Thiswillactivatethelogicalvolume

onthatpoolmember.

Figure101

Step2. AccesstheCXUI&replicateallthevirtualdisksoftheguestmachinesontheproduction

XenServerpool). GuestmachinesbelongingtoapooledCitrixXenServerwillappearasXen

Poolvolumes.

Click

on

Volume

protection

then

expand

Xen

Pools

to

find

the

virtual

diskcorrespondingtotheguestmachine.ClickonStartReplication

Figure102

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Step3. Inthenextscreen,expandthetargetXenServerpoolmembertoselectthetargetvolume,

thenscrolldowntosettheReplicationOptions

Figure103





Figure104

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Step5. EnsurethattheMediaRetentionoptionisenabled,therestofthefeaturesare

optional.ClickonSubmittocontinue

Figure105

Step6. ByenablingtheMediaRetentionoption,youwillrequiretodefinearetentionpolicy.

Selectthedesiredretentionpolicysuchastimebased,spacebasedoracombinationofboth.

ClickonSubmittocontinue

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74

Figure106

Step7. SelectthereplicationpairandclickonFinishtostartthereplicationpair.

Step8.

This

will

start

the

replication

pair.

The

replication

pair

will

reach

Differential

Sync

Figure107


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19.2Consistencytags

Accessthesourceguestmachineandissueconsistencytags.Thesetagslateractasmarkersto

whichyoumayperformarecovery.Inthisexampleconsistencytagisissuedmanually,youmay

howeverchoosetoschedulethisthroughacronjob.

Step1. Toissueaconsistencytag,youwillneedtodownloadtheappropriatevacpscript.You

candownloadthisofftheCXUIbynavigatingtoSystem>Agentinstallers

Figure108

Ensurethatthescriptisgivenexecuteprivilegebeforeyouissuethefollowingcommand

./vacp32 v -remote serverdevice < s o u r ce v o l u m e > -t

-serverip -serverport 20003

Figure109

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20Failover

20.1Rollbackapproach

Torecoveryouwillneedtorollbackthetargetvolumebacktoaconsistentpoint. Ensurethat

thesourceguestmachinesareshutdownbeforeperformingarollback.

Step1. ClickonRecoveryontheCXUI,selectthereplicationpairtoberolledbackandclick

onRollback.Youwillbepromptedforaconfirmation,clickonOktocontinue

Figure110


option

Figure111

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Step3. Youshouldseetheinterfacechangetothesearchresultasshownbelow.Selectthe

desiredconsistencytagtowhichthetargetvolumewillberolledbackandclickonSave

Figure112

Step4. Therollbackwillsooncompletethenproceedtothenextstep

Figure113

Step5. StarttheguestmachinesonthetargetCitrixXenServerpool,theyshouldcomeup

normallywithoutrequiringanyconfigurationchanges

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20.2SnapshotApproach

Ratherthanrollingthetargetvolumebackandstoppingthereplicationpair,youmaychoosethe

snapshotapproachofthetargetvolumetherebykeepingthereplicationpairintact.

20.2.1Prepareforsnapshot

Step1. Inthisapproachwewillfirstcreateavirtualdisk(SnapShotDisk)inthetargetSR

Figure114

Step2. MakethisvirtualdiskavailabletotheCXbychangingitsstatususingthecommand

lvchangeay.

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20.2.2Performsnapshot

Step1. ClickonRecoveryontheCXUI,selectthereplicationpairtoberolledbackandclick

onRecoverand clickonOktocontinue

Figure115


option

Figure116

Step3. UsePhysicalandthenselecttheDrivecorrespondingtothenewSnapShotDisk VDI

createdforthispurpose.Nowtakeasnapshotofthetarget,ontothisdisk.

Figure117

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80

Step4. CreateanewVMcorrespondingtothatofthesourceguestmachineinTargetsystem.

NowshutdownthisVM.

Step5. RemovetheoriginaldiskfromthisVMandattachthesnapshotdisktothisVM.

Figure118

Step6. StarttheVM,itshouldbootupnormally.

Figure119


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21Failback

21.1Rollbackapproach

Toperformafailbackinrollbackapproach,setareversereplicationfromthetargetPooltothe

sourcePool.NowperformareversereplicationfromtheTargetDrivetothesourceVDI(newly

created).




Figure79

Reversereplication

Step1. SetareversereplicationoftheTargetVMtothenewlycreatedVDIinthesourceSRwith

mediaretention.

Consistencytag


navigatetotheinmageagentinstallationpathtoissueaconsistencytag.Thesection11.2


Rollback




Step4. Oncetherollbackiscomplete,accesstheXenCenterinterfacetostarttheguestmachines

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82

21.2Snapshotapproach

Toperformafailbackfromsnapshotapproach,weneedtocreatetwonewVDIinSourceSRand

activatetheVDIinoneoftheHostsysteminSourcePool.OneVDIwillbeusedtosetupa

replicationpairandtheotherwillbeusedtotakesnapshotofthereplicationpairbasedonsome

consistency

tag.

Now

perform

a

reverse

replication

from

the

Target

snapshot

Drive

to

the

source

VDI(newlycreated).



Consistencytag:Consistencytagsis issuedtowhicharollbackwillbeperformed Snapshot:Takeonesnapshotofthereplicationpairbasedon aconsistencytag Attachthesnapshotdrive:NowattachthissnapshotdrivetoanewlycreatedVM. Startguestmachine:Theguestmachineshouldbootupwiththerolledbackvolume.

Figure79

Reversereplication

Step1. SetareversereplicationoftheTargetVMtothenewlycreatedVDIinthesourceSRwith

mediaretention.

Consistencytag


navigatetotheinmageagentinstallationpathtoissueaconsistencytag.Thesection11.2


Snapshot

Step3. UsethesecondVDItotakeasnapshotofthetargetdriveoncethepairisindifferential

syncbasedontheaboveissuedconsistencytag.RefertothesectionSnapshotapproachon

page33toperformarollback.


Step4.

Once

the

snapshot

is

complete,

create

anew

VM

>shutdown

the

VM

>detach

the

boot

diskandattachthissnapshotdisk.AccesstheXenCenterinterfacetostarttheguestmachines


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Part5:

Protecting

XenServer

Pool:

Master

targetguestapproach

ThispartexplainsprotectingaXenServerresourcepoolbyreplicatingsourcepoolstorageto

targetpoolstorageattachedtothemasterguestmachineonthetargetXenServerresourcepool

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22Introduction

ThissectiondescribesprotectingthesourceXenServerpooltoamasterguestmachineonthe

targetXenServerpool.

Figure120

Prepare

Thereareatotalofsixstepstobeperformedinthisstageasshowninthepictureabove.

Protect

ThissectionexplainstoreplicatethevirtualdisksofVMsonsourcepooltonewlycreatedvirtual

disksattachedtomasterguestmachineandissuingconsistencytagsatregularintervals.Issuing

consistencytagsmaybeautomatedbyusingacronjoboranyscheduler

Recover

Thissectiondescribesstepsinvolvedinperformingaphysicalsnapshotandbootinganother

guestmachineoverthesnapshotdisk.

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23Prepare

Step1. InstalltheVXagentoneachofthesourcepoolmembers

Step2. CreateRHEL5masterguestmachineontargetpool

Step3.

Access

the

master

guest

machines

command

prompt

and

open

the

file

/boot/grub/menutosetthedefaultvalueto1.Thisloadstheregularkernelratherthan

theXenServerskernel.

Figure121

Step4. InstalltheVXagentonthemasterguestmachine

Step5. Createanewvirtualdisk&attachittomasterguestmachinethroughtheXenCenter

interface

Figure122

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24Protect


Step1.

Access

the

CX

UI

and

click

on

Volume

Protection.

Expand

Xen

Pools

to

find

the

list

ofpoolsavailable. Thenexpandthesourcepooltoselectthesourceguestmachineandclick

onStartReplication

Figure123

Step2. SelecttheUnconfiguredpoolDriveandclickonNext

Figure124

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Step3. Thenextscreenappears,expandthemasterguestmachineandselectthenewly

created/attachedvirtualdiskandscrolldowntosettheReplicationoptions

Figure125

Step4. SelectthedesiredProcessServerandchecktheEnableCDPRetentionoptionclickon

Submittocontinue.

Figure126

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Step5. FilluptherequiredRetentionOptionsandclickSubmitbutton.

Figure127

Step6. Thefinalscreenappears,selecttheConfiguredPoolDriveandclickonFinishto

startthereplicationpair.

Figure128

Step7. ThereplicationpairstartswithResyncingStep1thenmovestoResyncingstep2and

finallyreachesDifferentialSync,indicatingthattheinitialcopyismadeonthetargetvolume

Figure129

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24.2Issueconsistencytags

OncethereplicationpairisinDifferentialSync,accessthesourceguestmachinescommand

prompt

and

issue

the

consistency

tag

through

the

vacp

utility.

The

vacp

utility

may

be

downloadedfromtheCXUIunderSystem>Agentinstallers

Figure130

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25Recover

25.1Addadisktocontainthesnapshot

AccesstheXenCenterinterfacetocreateanextradiskontargetpool&attachtothemasterguest

machinetoholdthesnapshotasshowninthepicturebelow.

Figure131

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25.2CreateaSnapshot

Step1. AccesstheCXUIandclickonRecovery,thenselectthereplicationpairandclickon

Recover

Figure132

Step2. SelecttheUsingApplicationconsistency&Eventbasedoption

Figure133

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Step3. TheSearchResultappears;selectthedesiredconsistencytag,thenselectDrive

TypeasPhysical.Selectthenewlyaddeddisktoholdthevirtualsnapshot,enterthe

mountpointandclickonSave.

Figure134

Notes:

Youmayrecoverspecificfilesbytakingavirtualsnapshot.Youwillneedtochoosethe

DriveTypeasVirtual.

Afterthevirtualsnapshotisready,accessthemasterguestscommandprompttosetupa

loop

device

to

the

virtual

snapshot

device.

This

loop

device

may

be

mounted

to

recover

individualfiles.

Thecommandtosetupaloopdeviceis

losetup/dev/loop/dev/vs/cx

Step4. YoumayobservethesnapshotstatusthroughtheRecoveryscreen

Figure135

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25.3Detachsnapshotdiskfrommasterguestmachine

Step1. AccesstheXenServerinterfaceandDeactivatethesnapshotvolumeasshowninthe

picturebelow.

Figure136

Step2. ThenDetachthesnapshotvolumefromthemasterguestmachine

Figure137

Step3. Youwillbepromptedforaconfirmation,clickonYestocontinue.

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25.4AttachtheSnapshotdisktoanotherGuest

Step1. Createanotherguestmachine

Step2. Attachthesnapshotdiskasshowninthepicture.

Note:VMshouldbestartedatleastoncebeforeattachingthebootvolumetotheVM

Figure138

Step

3.

Detach

the

earlier

disk,

you

will

be

asked

for

confirmation,

click

on

Yes

to

continue

Figure139

Step4. Starttheguestmachine,itshouldbootupnormally.

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Documents

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