Implementation and Use of Generic VTAM Resources with Parallel SYSPLEX Features

World®’16

ImplementationandUseofGenericVTAMResourcesWithParallelSysplex FeaturesJohnSiraco,Director,SoftwareEngineeringCATechnologies

MFX105S

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Abstracts

ThissessionwillcovertheGenericVTAMResourceenhancementandParallelSysplexFeaturesandhowthetwooptionscombinedcanbeleveragedtoImprove24X7availability,balanceworkloads,andeliminatesinglepointoffailuresforyourCAIDMS™systems.

JohnSiraco

CATechnologiesDirectorSoftwareEngineering


Agenda

WHYHIGHAVAILABILITY

GENERICVTAM RESOURCES

DYNAMICRUNUNITROUTING

PARALLELSYSPLEXFEATURES

SHAREDCACHE

DATASHARING

1

2

3

4

5

6


WhyHighAvailability?

§ 24x7businessandservice

§ Internationaloperations

§ Zerooutageinitiatives


CAIDMSinaParallelSysplex andGenericVTAMResources

CAIDMSCV1

CAIDMSCV2

CAIDMSCV3

CAIDMSCV4

CouplingFacility

Fin

Mfr

Cust

CVSpecificVTAMAPPLID

GenericVTAMResourceIDGenericVTAMResourceID


GenericVTAMResources

§ DefinitionoftheGenericVTAMResourceontheVTAMlinedefinitionistheonlyIDMSspecificationrequiredtouseGenericVTAMresources

DefinitionsandSpecifics

ADDLINEVTAM01APPLICATIONIDISU31II110GENERICRESOURCEISIDMSGVR2

GenericVTAMResourcevalue



§ GenericVTAMresourcevaluecannotbedefinedintheVTAMLSTdatasetforVTAM

DefinitionsandSpecificsContinued



§ GenericVTAMresourceandthestandardVTAMapplicationIDarebothrequiredwhendefiningaGenericVTAMresource


ADDLINEVTAM01APPLICATIONIDISU31II110GENERICRESOURCEISIDMSGVR2

VTAMApplicationIDandGenericVTAM

resource



§ GenericIDcanbethoughtofasanothernamethatcanbeusedtoconnecttoanyIDMSsystemthatisusingthesameGenericVTAMresource

§ GenericResourceIDallowsoneormoreIDMSsystemstobeknowntoVTAMusingthesameGenericvalueID




§ TheuseofGenericVTAMResourcesdoesnotrequiretheuseofIDMSParallelSysplex features

§ SinceaconnectionisgoingtoberoutedtoanyIDMSinstancerunningonanyLPARwithintheSYSPLEXtheIDMSregionsmusthavealltransactionsdefinedandmusthavetherequiredDatabaseaccesstosupportthetransaction




§ InflighttransactionsonCAIDMSsystemsthataretakenofflineorfailwillnotautomaticallyberestartedonanotherCAIDMSsystemsharingthesameGenericVTAMresource– ThesetransactionwillABENDandrolloutasnecessaryjustasthey

wouldwithouttheuseofGenericVTAMResources




§ Removesasinglepointoffailure– UsersdonotconnecttoaspecificinstanceofanIDMSsystem– IfoneormoreoftheIDMSsystemsusingthegenericidaretaken

down,fail,oreveniftheLPARistakendownorlost,userswillstillbeabletoconnecttoanyremainingIDMSsystemsonanyoftheLPARsthatarepartoftheSYSPLEX

§ ProvidesanadditionallevelofWorkloadBalancing– TheWorkLoadManager(WLM)willattempttobalanceandroute

worktotheIDMSsystemsthatareusingtheGenericVTAMresourceifWLM=YESisspecifiedintheGRPREFSfilecontainedintheVTAMLSTusedbyVTAM(Discussedlater)

Benefits



§ GenericResource:– MustfollowVTAMdefinitionalguidelines

§ Cannotstartwithanumericvalue– Forexample,1(Startingwithanumericisinvalid)butA1wouldbeok

§ AnyCharacterorSpecialcharactercanbeused– Forexample,@@@@@@@@isacceptable

– A(justtheletterA)isacceptable

– ThewordsOFForNONEcannotbeusedsincethesevaluesareusedtodroporremoveanexistingGenericVTAMResourcespecification

– GenericResourceis‘’alsoclearsthevalueinSYSGEN

Naming



§ XCFgroupISTCFS01andXESStructureISTGENERICareused

§ ISTCFS01isprovidedbyIBMforVTAMwhenusingXCF– TalktoVTAM,SYSPROG,orpersonatyoursiteresponsibleforcreating

ormaintainingIBMprovideddefinitions

XCFDefinitions(non-IDMS)

STRUCTURENAME(ISTGENERIC)SIZE(60M)INITSIZE(30M)PREFLIST(COUPLET1,COUPLET2)

SampleISTGENERICdefinition



§ ToallowtheWLMtobalanceandrouterequeststosystemsintheSYSPLEX– RequiresadefinitionintheVTAMLST“GRPREFS”dataset

§ Definitioncanbeadefaultdefinition(notspecificallynamedandshownbelow)

VTAMDefinitions(non-IDMS)

SAMPGRPFVBUILDTYPE=GRPREFS

GRPREFGRGREXIT=NO,WLM=YES,

LOCAPPL=YES,LOCLU=YES,PASSOLU=YES



§ ToallowtheWLMtobalanceandrouterequeststosystemsintheSYSPLEX– RequiresadefinitionintheVTAMLST“GRPREFS”dataset

§ OrSpecificallynamedfortheIDMSGenericVTAMresource(asshownhere)

VTAMDefinitions(Optional-IDMS)

SAMPGRPFVBUILDTYPE=GRPREFS

IDMSGVR2 GRPREFGRGREXIT=NO,WLM=YES,

LOCAPPL=YES,LOCLU=YES,PASSOLU=YES



§ GRPREFSWLM=YESisneededtousetheWLMforGenericVTAMresourceresolution

Seez/OSCommunicationsServerSNAResourceDefinitionReferenceforadditionalinformation

VTAMDefinitions(non-IDMS)



§ FailureswhentryingtoconnecttotheGenericVTAMresourceatlineopentimewillresultinthefollowingmessagebeingdisplayed:

§ CAIDMS- RequestforVTAMGenericResourcefailed- notsupportedbythisenvironment– Someoftheprobablecausesofthismessageare:

§ NoCouplingFacilitybeingused§ TheLPARisnotamemberofaSYSPLEX§ OneormoreoftherequiredCouplingFacilitydefinitionsaremissing

– XESstructureISTGENERICand/orXCFGroupISTCFS01§ ValuespecifiedforGenericVTAMresourceisinvalid

ProblemsorFailures


GenericVTAMResourcesVTAMDisplays

Command: D NET,ID=IDMSGVR2 <-- VTAM Generic Resource Name used in CA IDMS a CV line definition Display: IST097I DISPLAY ACCEPTED IST075I NAME = IDMSGVR2, TYPE = GENERIC RESOURCE IST1359I MEMBER NAME OWNING CP SELECTABLE APPC IST1360I USILDA01.U31II110 A31X99 DEL NO IST1360I USILDA01.U11ITCH8 A11X99 YES NO IST2210I GR PREFERENCE TABLE ENTRY = **DEFAULT** IST2202I GREXIT = NO WLM = YES LOCLU = YES IST2204I LOCAPPL = YES PASSOLU = NO IST314I END


GenericVTAMResourcesDisplays

DCMT D LINES *** Display Lines (ALL) Request *** Driver Type and/or APPL/Table Number of VTAM Line-ID Status Module Access Method DD/Other PTerms Resource ------- ------ ------ ------------- ---------- --------- -------- UCFLINE InSrv RHDCD0ZU UCF RHDCFSTB 79 CCILINE InSrv RHDCD0LV CCI TECHD120 96 VTAM InSrv RHDCD05V VTAM 3270 U31II110 510 IDMSGVR2


GenericVTAMResourcesDisplaysContinued

DCMT D LINE VTAM *** Physical Line Display ***

PLine-ID VTAM Status InSrv Module 5V

Compact 23.45% Appl-ID U31II110 GenRsrc IDMSGVR2

LTerm-ID PTerm-ID Type/M Status Term-ID VL500001 VP500001 3279 5 InSrv A01TE001



§ Apply18.5PTFRO89482toimplementGenericVTAMResources

§ Includedinversion19.0IR4

Implementation


CAIDMSParallelSysplexFeatures

SharedCache

DataSharing

DynamicRunUnitRouting


ParallelSysplex

§ EnablesmultipleCVretrieval– Oneupdatesystem– Multipleretrievalsystems

§ Enablesdatasharing(multipleupdatesystems)

SharedCache


DefiningtheSharedCache

§ DefinetheSharedCachetotheCouplingFacility

STRUCTURENAME(IDMSSUPPCACHE002)SIZE(5120)PREFLIST(COUPLET1)


DefiningtheSharedCachetoCAIDMS

ALTERDMCLGLBLDMCLDATASHARINGDEFAULTSHAREDCACHEIDMSSUPPCACHE002LOCKENTRIES100000MEMBERS5ONCONNECTIVITYLOSSNOABEND

INCLUDESEGMENTDBCRDATASHARINGYESDEFAULTSHAREDCACHEIDMSSUPPCACHE002


SharedCacheBenefits

Improveperformance• ForupdateandretrievalCVs

• Secondlevelofbuffering

Sharedatainretrievalacross

multipleCVs

RetrievalCVsstayactive

whenupdateCVisdown

EnablesDataSharing


ParallelSysplex

Keyelements

§ Datasharinggroup– NamedcollectionofCAIDMSsystemsinaSysplex– EachCAIDMSsystemisamemberofthatgroup

§ SharedCachemaintainsfiledata

NotthesameasaDBGROUP

DataSharing

MultipleCVsupdatethesameDB


ParallelSysplex

§ CouplingfacilityinKbytes– Definealiststructure– Definealockstructure

§ DefinitioninDMCL– Defaultdatasharingattribute– Segmentorfiledatasharingattribute

DataSharingContinued

Definitions

STRUCTURENAME(CAIDMSSUPPGRP1LI)SIZE(4096)PREFLIST(COUPLET1)

STRUCTURENAME(CAIDMSSUPPGRP1LK)SIZE(5120)PREFLIST(COUPLET1)

+- DEFAULTSHAREDCACHEdefault-cache-name-¦

DATASHARINGYES

DATASHARINGYES/NO/DEFAULT


ParallelSysplexDataSharingContinued

SYSIDMSdefinitioninCVJCL

//SYSIDMSDD*DSGROUP=SUPPGRP1DCNAME=TECHD110


ParallelSysplex Features

AllowmultipleCVstoupdatethesamedatabase

Supports24x7

processing

EnablesCVfail-over

Improvesperformance

DataSharingBenefits


ParallelSysplex

WorkloadBalancing

§ BetweenCAIDMS/DBsystemsinaSysplex

§ Dynamicbasedonactualsystemload

§ DBGROUP– Definitions

§ BackendandfrontendIDMS§ Couplingfacilitystructure



ParallelSysplex

§ Backenddefinitions– AddDBGROUPstatement(s)toDatabaseNameTable– CREATEDBGROUPassignsthebackend(s)toaDBGROUP(S)CREATE DBGROUP R185DBTB.SPGROUP1 ENABLED


DBGROUPs


ParallelSysplex

§ Frontenddefinitions– DefinebackendDBGROUPasanodeintheResourcenametableADD NODE SPGROUP1 GROUP DEFAULT NODE TECHD110


DBGROUPs


ParallelSysplex

– DefineaCouplingFacilitystructure– DBGROUPnamemustbeprefixedwith“CAIDMS”– SizeisinKbytes

DynamicRunUnitRoutingContinued

STRUCTURENAME(CAIDMSSPGROUP1)SIZE(512)PREFLIST(xxx)

Couplingfacilitydefinition


ParallelSysplex

DynamicWorkloadBalancing

WorkprocessedbyCVswith

availablecycles

Reduceresponsetimeandincrease

throughput

24x7processing

CVsprovidefail-overforeachother

DynamicRunUnitRoutingBenefits


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Implementation and Use of Generic VTAM Resources with Parallel SYSPLEX Features