Advanced DBA – High Availability for MUF

World®’16

AdvancedDBA–HighAvailabilityforMUFKevinShumaVP,ProductManagementCATechnologies

MFX64E

MAINFRAMEANDWORKLOADAUTOMATION

Abstract

ThissessiondescribestheavailableoptionsforsitesthatneedtokeeptheirCADatacomenvironments(MUFs)operationalforextendedperiodsoftime.ThisincludefunctionalitytocoverIPLs,systemsoutagesandevenCADatacomsoftwareupgrades.

ThissessionwillprimarilycoverthenewfeaturesavailableintheCADatacom®/DBprocessingthatallowstheCADatacomenvironment(MUF)tomigratefromoneaddressspacetoanotherwithoutanoticeableoutagetotheendusers.

KevinShuma

CATechnologiesVP,ProductManagement

Agenda

WHATISHIGH-AVAILABILITYFORDATABASEENVIRONMENTS

DATASHARINGSHADOWTECHNOLOGY

ACTIVE-QUERY(ACTIVE-ACTIVEARCHITECTURE)

SUMMARY

Whatishigh-availability?

“Highavailabilityisacharacteristicofasystem,whichaimstoensureanagreedlevelofoperationalperformance,usuallyuptime,forahigherthannormalperiod.”

“Ifausercannotaccessthesystem,itis- fromtheuserspointofview– unavailable.Generally,thetermdowntimeisusedtorefertoperiodswhenasystemisunavailable.”

AccordingtoWikipedia

Whatishigh-availabilityfordatabaseenvironments

§ TheabilityfortheDatacomenvironment(MUF)toremainupormigratefromoneaddressspacetopanotherwithoutanoticeableoutagetotheend-user– Donotinterruptuserdataaccessfor

§ MUFfailures§ IPLs§ Softwaremaintenance§ Softwareupgrades(newreleases)§ JustabouteverythingaSYSPROG“needs”todotokeepasystemrunning

FromaCADatacomperspective

Datasharingshadowtechnology

§ CADatacomsupports3differentdatasharingtechniques

§ TheShadowMUFistherecommendedandmostusedtechnique– Provides24x7failover– ProvidesmigratecapabilitiesforuseduringIPLs– Providescapabilitiesforimplementingsoftwaremaintenance– (V15.0)Providescapabilitiesforimplementinganewrelease

AspecialformofDataSharingShadowTechnology

§ PrimaryMUF– istheMUFinstanceupandenabledatthatmomentoftime

§ ShadowMUF– isthesecondinstanceoftheMUFthatisconsiderednotenabledbutrunningonsameLPARoradifferentLPARonthesameSYSPLEX

§ BothMUFssharethesamesetofdatabases(DASD)

AspecialformofDataSharing

Primary

Shadow

ShadowTechnology(cont’d)

§ XCFisusedasthemessageservicebetweentheshadowandtheprimaryMUF

§ IfXCFserviceisstoppedorabends– Possiblelossofcommunicationbetween

thePrimaryandShadowMUFispossible– ShadowMUFcannottakeover,must

beforcedtotakeover– Thisisveryrareintoday’sworld

Primary

Shadow

§ XCFmessages– PrimaryMUFDSNZMFM1

DSNZMFM1:MUFM1:DB02330W- SHADOWSTART,JOB=DSNZMFM2SYSTEM=CA31

– ShadowMUFDSNZMFM2DSNZMFM2:*:DB02301I- XESGROUPJOINED(QAPLEX1,SHADOW$$071)

DSNZMFM2:*:DB02325I- SHADOWMUFNOWWAITING

Primary

Shadow

§ Unplannedoutage– PrimaryMUFfails– LPARfails

§ Plannedoutage– ScheduledIPL– NeedtochangeMUFstart-upoptions– Scheduledsoftwaremaintenance– Scheduledreleaseupgrade(V14toV15)

Primary

Shadow

ShadowTechnology– Unplannedoutage

§ UnplannedShadowMUF– NoCFStructures– OnlyoneMUFupatatime,nointersection

oftwoMUFinstancescanoccur– NoworriesaboutMRDF,CBSandPXX

beingshared

Primary

Shadow

§ Applicationregionsuse“accessanywhere”toconnecttoprimaryMUF

§ ShadowMUFisstarted(sameordifferentLPAR)

§ XCFisusedtoSYNCMUFs

§ Shadow“watches”primary

§ ShadowopensallMUFdatasets,butdoesnotdorequestprocessing

CICSPLEXBATCH

CICSPLEXXCF

CICSTOR

DSNZMFM1

DSNZMFM2RemoteShadow

ShadowMUFPLEX

Allocation/Openonly

FullAccess

ShadowTechnology– UnplannedoutageAspecialformofDataSharing

§ PrimaryMUF(MUFPLX1)fails

§ ExistingtransactionsnotifiedofMUFfailure

§ RemoteShadowautomaticallydetectsfailure

§ RemoteShadowbeginsclean-upoffailedMUF

§ Newrequestscanbetoldto“wait”

§ RemoteShadowbecomesMUFPLX1

ShadowTechnology– Unplannedoutage(cont’d)LPAR

CICSPLEXBATCH

CICSPLEXXCF

CICSTOR

DSNZMFM1

BATCHNewDBreqwait NewDBreqwait

Fullaccess/beginclean-upandnewwork

ShadowMUFPLEXDSNZMFM2

RemoteShadow

§ Applicationswithreconnectcapabilitiesre-establishconnectionsandcontinueprocessing

§ Briefpauseinservice,butnotanoutage

§ SiterestartsfailedMUFregionanditautomaticallydetectsthatitisnowtheShadowLP

CICSPLEXBATCH

CICSPLEXXCF

CICSTOR

ShadowMUFPLEX

NewBATCH

FullAccess

Allocation/Openonly

DSNZMFM1RemoteShadow

DSNZMFM1

ShadowTechnology– Unplannedoutage(cont’d)

§ PlannedShadowMUF– CFstructurerequired– TwoMUFscanbeupsotherulesforfulldatasharing

arenowenforced– CanusetheMigratecommandordotheprocess

manually– IfeitherMUFinstancefailsduringthisprocess,must

restarttheMUFinstancethatfailedASAP– EOJofeitherMUFinstanceremovestheaspectsoffull

datasharing– TimelinefortwoMUFinstancesbeingupatthesame

timeshouldbeconsideredtobebrief

AspecialformofDataSharingShadowTechnology– Plannedoutage

Primary

Shadow

§ IssueMIGRATEcommandtoconvertRemoteShadowintoafulldatasharingMUF

§ CouplerFacilityusedtosynchronizetwomemberMUFs

§ BothMUFsnowfullparticipants

ShadowTechnology– PlannedoutageLPAR

CICSPLEXBATCH1

CICSPLEX

CICSTOR

ShadowMUFPLEXforIPLCoupler

FullAccess FullAccess

DSNZMFM1

DSNZMFM2ActiveMUF

§ AllapplicationsnowrunningonLPAR2

§ StopMUFonLPAR1§ Useofcouplerstops§ IPLLPAR1§ OncecompleterestartShadowonLPAR1

§ CouldissueMIGRATEtoreverttooriginalstate

§ CoulduseShadowonLPAR3whileLPAR1IPL’d

ShadowTechnology– Plannedoutage(cont’d)

CICSPLEXBATCH1

CICSPLEX

CICSTOR

MUFPLX1

ShadowMUFPLEXforIPL

Coupler

BATCH2BATCH3

FullAccess

DSNZMFM2ActiveMUF

§ Upgradefrom14.0to15.0– Recommendthecodeonlybedoneatthistime– OneMUFinstancecanbe14.0– OtherMUFinstancecanbe15.0– RecommendnotleavingbothMUFinstancesup

verylong– DBIDFormat3andDBIDFormat2messageswill

beoccurringinbothMUFs

Primary

Shadow

§ Recommendyoubringdownthe14.0MUFinstanceassoonasyoucan

§ ThenrestarttheShadowMUFas14.0forfallback

§ Thisupgradeprocessissupported,butitisnotthepathweexpecttheclientstotake– UpgradepathshouldnotbedonewithtwoMUFsup

Primary

Shadow

ShadowTechnology– OtherConsiderations

§ ProductssuchasCA7andCA11havethebuilt-inlogictorecognizeaMUFfailureandautomaticallyreconnecttotheShadowwithoutlossofinformation

§ CADatacomprovidesasuiteof“online”utilitiessothatitemslikedatareorganizationaresupportedwhilethedataisinuse– Thesefunctionsarenotallowedwhenrunningdatasharingmodefor

twoormoreMUFinstancesatthesametime

ShadowTechnology– OtherConsiderations(cont’d)

§ HowAreClientsUsingShadow?– Largenumberofsiteshavenotimplementedthis– Fortheoneswhohave,probablyover90%usetheunplannedversion

ofShadow(noCFstructure)– Theremaining5-10%usetheplannedoutageoftheShadowMUF

(requiresCFstructure)

Active-Query(Active-ActiveArchitecture)

RemoteReplicationTechnology

§ Active-Standby

§ Active-Query

§ Active-Active

ActiveArchitecture

RemoteReplicationTechnology– ActiveStandby

§ Primaryimagerunsinfullupdatemode– Usertransactionsaredirectedbyarouterto

thecurrent“primary”datamanager– Dynamicswitchingcanoccurtoshiftworkload

iftheprimarydatamanagerfails– Secondary“standby”imagedoesnotprocess

anyuserwork– Allusersissuedatarequestsontheprimary

image– Datachangesarereplicatedinatimelyfashion

fromtheprimarytothestandbyimage

ActiveArchitecture

RemoteReplicationTechnology– ActiveQuery

§ Primaryimagerunsinfullupdatemode– Userupdatetransactionsaredirectedbya

routertothecurrent“primary”image– Dynamicswitchingcanoccurtoshift

workloadiftheprimaryimagefails– Userquerytransactionscanbedirectedto

the“query”imagewhichallowsworktobeprocessed

– Datachangesarereplicatedinatimelyfashionfromtheprimarytothequerydatamanagementimage

ActiveArchitecture

RemoteReplicationTechnology

§ ComponentsUsed

§ Prerequisites

§ MQTSOverview

§ OperationalOverview

§ SampleOutput

ActiveQuery– DatacomV14.02

RemoteReplicationTechnology- Components

§ ChangeDataCapture(CDC)– Builtinfacilitytocapturechangesforselectedtables– ChangesstoredinaDatacomdatabaseasTSNandMNTrows

§ MQTransportService(MQTS)- PartofIPC15.0– NewIPCfacilitytoenableDatacomcomponentstointeract

withIBMMQ

§ NewCDCRemoteReplicationcomponent– NewDatacomdeliverablesthatmovethedatafromtheCDC

acrossMQtoatargetMUF

ActiveQuery– DatacomV14.02/IPCV15.0

RemoteReplicationTechnology- Prerequisites

§ SourceMUFenvironment

§ TargetMUFenvironmentsynchronizedtosourceMUF

§ MQsubsystemsforeachenvironment– MQqueuesdefinedforsendingfromsourcetotargetsystem

§ IPC15.0installed(MQTS)

§ CDCremotereplicationservicesinstalled– RO81655forR14– RO81529forR15

RemoteReplicationTechnology- MQTS

§ OperatesonIBMMQqueues– RequiresMQsetup,partofIPC15.0(compatiblewithDB14.0and15.0)

§ MQTSusesaworkloadIDtoconstructtheMQqueuenames– CAMQTS.queue.workloadID– Wherequeueis:

§ SOD– Source,outgoing,data(connectswithremote’sTID)§ SID– Source,incoming,data(connectswithremote’sTOD)§ TOD– Target,outgoing,data(connectswithremote’sSID)§ TID– Target,incoming,data(connectswithremote’sSOD)§ XQ– Transmissionqueue

RemoteReplicationTechnology– MQTS(cont’d)

§ MQTStoMQChannels

§ MQTSusestheworkloadIDtoconstructtheMQchannelnames– CAMQTS.channel.workloadID– Wherechannelis:

§ HA– SystemAtoBcommunication§ HB– SystemBtoAcommunication

§ Remote’schannelnamesmustmatchlocal’schannelnames

RemoteReplicationTechnology– MQOverviewActiveQuery– DatacomV14.02/IPCV15.0

Example:WRKLD03MQQueueRelationshipsforWorkload

RemoteReplicationTechnology– MQOverviewActiveQuery– DatacomV14.02/IPCV15.0

RemoteReplicationOperationalOverview

§ DBCDSPR- TheSender– Providecontrolstatementstogive:

§ CDCDBIDtoprocess§ TheMQTSWorkloadID§ Otherparameterstocontrolbuffersizes,waitlimits,retrycounts,etc.

– ConnectstothesourceMUF– ConnectstoMQviaMQTSSEND– SendschangeddatatothereceiverviaMQ– Respondstoconsolecommands

§ DBCDRPR– TheReceiver– Providecontrolstatementstogive:

§ TheMQTSWorkloadID§ Otherparameters

– ConnectstothetargetMUF– ConnectstoMQviaMQTS– GeneratesURTsforthetargetMUF– ReceivesMQdataviaMQTSRECEIVE– AppliesupdatestothetargetMUF– Respondstoconsolecommands

SampleOutputSenderActiveQuery– DatacomV14.02/IPCV15.0

SampleOutputSender(cont’d)ActiveQuery– DatacomV14.02/IPCV15.0

Senderthroughputstatistics,responsetoSTATUScommand

SampleOutputReceiverActiveQuery– DatacomV14.02/IPCV15.0

Receivermessagesatstartup

SampleOutputReceiver(cont’d)ActiveQuery– DatacomV14.02/IPCV15.0

Receiverthroughputstatistics,responsetoSTATUScommand

RemoteReplicationTechnology- Summary

§ NewMQTransportServiceprovides– MQwrappersothatsender/receiverdon’thavetohaveMQknowledge

§ CDCusedtocapturechangesatsource

§ Senderusedtopackagesourcechangesandsendtoreceiver– OncesentdeleteschangesfromsourceCDC

§ ReceiverusedtotakepackagedchangesfromMQandapplytotargetMUF– OnceapplieddeletespackagefromMQ

SummaryAFewWordstoReview

ExperiencesVarioussiteshasusedthesefunctionstokeeptheirdatabaseenvironmentavailable24x7foranumberofyears.

KeyTopicsIntoday’sworld,databaseenvironmentsmustbeabletoprovide24x7access.

FindingsCADatacomShadowMUFdelivershigh-availabilitywhilethenewRemoteReplicationfeaturesetsthebaseforcontinuousavailability.

MainframeandWorkloadAutomation

FormoreinformationonMainframeandWorkloadAutomation,pleasevisit:http://cainc.to/9GQ2JI

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