/Users/andrea/_magisterarbeit/korpus/clean/trainkorpus/30/file_242.html NN ----------------------------------------- : summary NN of IN site NN wide JJ JavaScript NN functionality NN United NP States NPS English NP Contact NP HP NP Search NP . SENT HP NP OpenVMS NP Systems NPS All NP of IN HP NP HP NP OpenVMS NP Systems NPS Documentation NN OpenVMS NP Performance NP Management NP Order NP Number NP . SENT AA NN R NP 237 CD C NP TE NN April NP 2001 CD This DT manual JJ is VBZ a DT conceptual JJ guide NN for IN experienced JJ users NNS responsible JJ for IN optimizing VVG performance NN on IN OpenVMS NP systems NNS . SENT For IN information NN about IN OpenVMS NP performance NN on IN AlphaServer NP GS NP 80 CD 160 CD 320 CD systems NNS , , see VVP the DT OpenVMS NP on IN AlphaServer NP GS NP Series NP Systems NPS Configuration NN and CC Performance NN Guidelines NNS , , available JJ at IN http NN . SENT www JJ . SENT openvms NNS . SENT compaq NP . SENT com NN gsseries NNS index NN . SENT html NN . SENT Revision NN Update NN Information NN . SENT This DT manual JJ supersedes VVZ the DT OpenVMS NP Performance NP Management NP , , OpenVMS NP Version NP 7 CD . SENT 2 LS . SENT Software NP Version NP . SENT OpenVMS NP Version NP 7 CD . SENT 3 CD Compaq NP Computer NP Corporation NP Houston NP , , Texas NP 2001 CD Compaq NP Computer NP Corporation NP Compaq NP , , VAX NP , , VMS NP , , and CC the DT Compaq NP logo NN Registered VVN in IN U NP . SENT S NP . SENT Patent NN and CC Trademark NN Office NN . SENT OpenVMS NP is VBZ a DT trademark NN of IN Compaq NP Information NP Technologies NPS Group NP , , L NP . SENT P NN . SENT in IN the DT United NP States NPS and CC other JJ countries NNS . SENT All DT other JJ product NN names NNS mentioned VVN herein RB may MD be VB the DT trademarks NNS of IN their PP$ respective JJ companies NNS . SENT Confidential JJ computer NN software NN . SENT Valid JJ license NN from IN Compaq NP required VVN for IN possession NN , , use NN , , or CC copying NN . SENT Consistent JJ with IN FAR RB 12 CD . SENT 211 CD and CC 12 CD . SENT 212 CD , , Commercial NP Computer NP Software NP , , Computer NP Software NP Documentation NN , , and CC Technical NP Data NP for IN Commercial JJ Items NNS are VBP licensed VVN to TO the DT U NP . SENT S NP . SENT Government NN under IN vendor's NNS standard JJ commercial JJ license NN . SENT Compaq NP shall MD not RB be VB liable JJ for IN technical JJ or CC editorial JJ errors NNS or CC omissions NNS contained VVD herein RB . SENT The DT information NN in IN this DT document NN is VBZ provided VVN as RB is VBZ without IN warranty NN of IN any DT kind NN and CC is VBZ subject JJ to TO change VV without IN notice NN . SENT The DT warranties NNS for IN Compaq NP products NNS are VBP set VVN forth RB in IN the DT express JJ limited JJ warranty NN statements NNS accompanying VVG such JJ products NNS . SENT Nothing NN herein RB should MD be VB construed VVN as IN constituting VVG an DT additional JJ warranty NN . SENT The DT following VVG are VBP trademarks NNS of IN Compaq NP Computer NP Corporation NP . SENT Alpha NP , , ACMS NP , , DDIF NP , , DECdirect NP , , DECnet NP , , HSC NP , , and CC MicroVAX NP . SENT The DT following VVG are VBP third JJ party NN trademarks NNS . SENT Motif NN and CC UNIX NP are VBP trademarks NNS of IN The DT Open NP Group NP in IN the DT United NP States NPS and CC other JJ countries NNS . SENT ZK NP 6491 CD The DT Compaq NP OpenVMS NP documentation NN set NN is VBZ available JJ on IN CD NP ROM NP . SENT This DT document NN was VBD prepared VVN using VVG DECdocument NP , , Version NP V NN 3 CD . SENT 3 CD 1 CD e NN . SENT Contents NNS Index NP Preface NN This DT manual JJ presents NNS techniques NNS for IN evaluating VVG , , analyzing VVG , , and CC optimizing VVG performance NN on IN a DT system NN running VVG OpenVMS NP . SENT Discussions NNS address VVP such JJ wide JJ ranging VVG concerns NNS as RB . SENT Understanding VVG the DT relationship NN between IN work NN load NN and CC system NN capacity NN Learning NP to TO use VV performance NN analysis NN tools NNS Responding VVG to TO complaints NNS about IN performance NN degradation NN Helping VVG the DT site NN adopt VV programming NN practices NNS that IN result NN in IN the DT best JJS system NN performance NN Using VVG the DT system NN features NNS that WDT distribute VVP the DT work NN load NN for IN better JJR resource NN utilization NN Knowing VVG when WRB to TO apply VV software NN corrections NNS to TO system NN behavior NN tuning VVG the DT system NN to TO allocate VV resources NNS more RBR effectively RB Evaluating VVG the DT effectiveness NN of IN a DT tuning VVG operation NN . SENT knowing VVG how WRB to TO recognize VV success NN and CC when WRB to TO stop VV Evaluating VVG the DT need NN for IN hardware NN upgrades NNS The DT manual JJ includes VVZ detailed JJ procedures NNS to TO help VV you PP evaluate VV resource NN utilization NN on IN your PP$ system NN and CC to TO diagnose VV and CC overcome VV performance NN problems NNS resulting VVG from IN memory NN limitations NNS , , I NP O NP limitations NNS , , CPU NN limitations NNS , , human JJ error NN , , or CC combinations NNS of IN these DT . SENT The DT procedures NNS feature VVP sequential JJ tests NNS that WDT use VVP OpenVMS NP tools NNS to TO generate VV performance NN data NNS . SENT the DT accompanying JJ text NN explains VVZ how WRB to TO evaluate VV it PP . SENT Whenever WRB an DT investigation NN uncovers VVZ a DT situation NN that WDT could MD benefit VV from IN adjusting VVG system NN values NNS , , those DT adjustments NNS are VBP described VVN in IN detail NN , , and CC hints NNS are VBP provided VVN to TO clarify VV the DT interrelationships NNS of IN certain JJ groups NNS of IN values NNS . SENT When WRB such JJ adjustments NNS are VBP not RB the DT appropriate JJ or CC available JJ action NN , , other JJ options NNS are VBP defined VVN and CC discussed VVN . SENT Decision NN tree NN diagrams VVZ summarize VV the DT step NN by IN step NN descriptions NNS in IN the DT text NN . SENT These DT diagrams NNS should MD also RB serve VV as IN useful JJ reference NN tools NNS for IN subsequent JJ investigations NNS of IN system NN performance NN . SENT This DT manual JJ does VVZ not RB describe VV methods NNS for IN capacity NN planning NN , , nor CC does VVZ it PP attempt VVP to TO provide VV details NNS about IN using VVG OpenVMS NP RMS NP features NNS hereafter RB referred VVD to TO as IN RMS NP . SENT Refer VV to TO the DT Guide NP to TO OpenVMS NP File NP Applications NP for IN that DT information NN . SENT Likewise RB , , the DT manual JJ does VVZ not RB discuss VV DECnet NP for IN OpenVMS NP performance NN issues NNS , , because IN the DT DECnet NP Plus NP for IN OpenVMS NP Network NP Management NP manual JJ provides VVZ that DT information NN . SENT Intended VVN Audience NN This DT manual JJ addresses NNS system NN managers NNS and CC other JJ experienced JJ users NNS responsible JJ for IN maintaining VVG a DT consistently RB high JJ level NN of IN system NN performance NN , , for IN diagnosing VVG problems NNS on IN a DT routine JJ basis NN , , and CC for IN taking VVG appropriate JJ remedial JJ action NN . SENT Document NN Structure NN This DT manual JJ is VBZ divided VVN into IN 13 CD chapters NNS and CC 4 CD appendixes NNS , , each DT covering VVG a DT related JJ group NN of IN performance NN management NN topics NNS as RB follows VVZ . SENT Chapter NN 1 CD provides VVZ a DT review NN of IN workload NN management NN concepts NNS and CC describes VVZ guidelines NNS for IN evaluating VVG user NN complaints NNS about IN system NN performance NN . SENT Chapter NN 2 CD lists VVZ postinstallation NN operations NNS for IN enhancing VVG performance NN and CC discusses VVZ performance NN investigation NN and CC tuning VVG strategies NNS . SENT Chapter NN 3 CD discusses VVZ OpenVMS NP memory NN management NN concepts NNS . SENT Chapter NN 4 CD explains VVZ how WRB to TO use VV utilities NNS and CC tools NNS to TO collect VV and CC analyze VV data NNS on IN your PP$ system's JJ hardware NN and CC software NN resources NNS . SENT Included VVN are VBP suggestions NNS for IN reallocating VVG certain JJ resources NNS should MD analysis NN indicate VV such PDT a DT need NN . SENT Chapter NN 5 CD outlines VVZ procedures NNS for IN investigating VVG performance NN problems NNS . SENT Chapter NN 6 CD describes VVZ how WRB to TO evaluate VV system NN resource NN responsiveness NN . SENT Chapter NN 7 CD describes VVZ how WRB to TO evaluate VV the DT performance NN of IN the DT memory NN resource NN and CC how WRB to TO isolate VV specific JJ memory NN resource NN limitations NNS . SENT Chapter NN 8 CD describes VVZ how WRB to TO evaluate VV the DT performance NN of IN the DT disk NN I NN O NN resource NN and CC how WRB to TO isolate VV specific JJ disk NN I NN O NN resource NN limitations NNS . SENT Chapter NN 9 CD describes VVZ how WRB to TO evaluate VV the DT performance NN of IN the DT CPU NN resource NN and CC how WRB to TO isolate VV specific JJ CPU NN resource NN limitations NNS . SENT Chapter NN 10 CD provides VVZ general JJ recommendations NNS for IN improving VVG performance NN with IN available JJ resources NNS . SENT Chapter NN 11 CD provides VVZ specific JJ recommendations NNS for IN improving VVG the DT performance NN of IN the DT memory NN resource NN . SENT Chapter NN 12 CD provides VVZ specific JJ recommendations NNS for IN improving VVG the DT performance NN of IN the DT disk NN I NN O NN resource NN . SENT Chapter NN 13 CD provides VVZ specific JJ recommendations NNS for IN improving VVG the DT performance NN of IN the DT CPU NN resource NN . SENT Appendix NN A DT lists NNS the DT decision NN trees NNS used VVN in IN the DT various JJ performance NN evaluations NNS described VVN in IN this DT manual JJ . SENT Appendix NN B NN summarizes VVZ the DT MONITOR NN data NN items NNS you PP will MD find VV useful JJ in IN evaluating VVG your PP$ system NN . SENT Appendix NN C NP provides VVZ an DT example NN of IN a DT MONITOR NN multifile NN summary NN report NN . SENT Appendix NN D NP provides VVZ ODS NP 1 CD performance NN information NN . SENT Related JJ Documents NNS For IN additional JJ information NN on IN the DT topics NNS covered VVN in IN this DT manual JJ , , you PP can MD refer VV to TO the DT following VVG documents NNS . SENT OpenVMS NP System NP Manager's NP Manual NP Guide NP to TO OpenVMS NP File NP Applications NP OpenVMS NP System NP Management NP Utilities NPS Reference NN Manual NP Guidelines NNS for IN OpenVMS NP Cluster NP Configurations NNS OpenVMS NP Cluster NP Systems NPS For IN additional JJ information NN about IN Compaq NP OpenVMS NP products NNS and CC services NNS , , access VV the DT Compaq NP website NN at IN the DT following VVG location NN . SENT http NN . SENT www JJ . SENT openvms NNS . SENT compaq NP . SENT com NN Reader's NP Comments NP Compaq NP welcomes VVZ your PP$ comments NNS on IN this DT manual JJ . SENT Please UH send VV comments NNS to TO either CC of IN the DT following VVG addresses NNS . SENT Internet NP openvmsdoc NP compaq NP . SENT com NN Mail NP Compaq NP Computer NP Corporation NP OSSG NP Documentation NN Group NP , , ZKO NP 3 CD 4 CD U NP 08 CD 110 CD Spit NN Brook NP Rd NP . SENT Nashua NP , , NH NP 03062 CD 2698 CD How WRB To TO Order NP Additional JJ Documentation NN Use VV the DT following VVG World NP Wide NP Web NP address NN to TO order VV additional JJ documentation NN . SENT http NN . SENT www JJ . SENT openvms NNS . SENT compaq NP . SENT com NN If IN you PP need VVP help NN deciding JJ which WDT documentation NN best NN meets VVZ your PP$ needs NNS , , call VVP 800 CD 282 CD 6672 CD . SENT Conventions NNS In IN this DT manual JJ , , every DT use NN of IN DECwindows NP and CC DECwindows NP Motif NN refers VVZ to TO Compaq NP DECwindows NP Motif NN for IN OpenVMS NP software NN . SENT The DT following VVG conventions NNS are VBP also RB used VVN in IN this DT manual JJ . SENT . SENT . SENT . SENT A DT vertical JJ ellipsis NN indicates VVZ the DT omission NN of IN items NNS from IN a DT code NN example NN or CC command NN format NN . SENT the DT items NNS are VBP omitted VVN because IN they PP are VBP not RB important JJ to TO the DT topic NN being VBG discussed VVN . SENT In IN command NN format NN descriptions NNS , , parentheses NNS indicate VVP that IN you PP must MD enclose VV choices NNS in IN parentheses NNS if IN you PP specify VV more JJR than IN one CD . SENT In IN command NN format NN descriptions NNS , , brackets NNS indicate VVP optional JJ choices NNS . SENT You PP can MD choose VV one CD or CC more JJR items NNS or CC no DT items NNS . SENT Do VV not RB type NN the DT brackets NNS on IN the DT command NN line NN . SENT However RB , , you PP must MD include VV the DT brackets NNS in IN the DT syntax NN for IN OpenVMS NP directory NN specifications NNS and CC for IN a DT substring JJ specification NN in IN an DT assignment NN statement NN . SENT In IN command NN format NN descriptions NNS , , vertical JJ bars NNS separate JJ choices NNS within IN brackets NNS or CC braces NNS . SENT Within IN brackets NNS , , the DT choices NNS are VBP optional JJ . SENT within IN braces NNS , , at IN least JJS one CD choice NN is VBZ required VVN . SENT Do VV not RB type NN the DT vertical JJ bars NNS on IN the DT command NN line NN . SENT bold JJ text NN This DT typeface NN represents VVZ the DT introduction NN of IN a DT new JJ term NN . SENT It PP also RB represents VVZ the DT name NN of IN an DT argument NN , , an DT attribute NN , , or CC a DT reason NN . SENT italic JJ text NN Italic JJ text NN indicates VVZ important JJ information NN , , complete JJ titles NNS of IN manuals NNS , , or CC variables NNS . SENT Variables NNS include VVP information NN that WDT varies VVZ in IN system NN output NN Internal NP error NN number NN , , in IN command NN lines NNS PRODUCER NN name NN , , and CC in IN command NN parameters NNS in IN text NN where WRB dd NP represents VVZ the DT predefined JJ code NN for IN the DT device NN type NN . SENT UPPERCASE JJ TEXT NN Uppercase JJ text NN indicates VVZ a DT command NN , , the DT name NN of IN a DT routine NN , , the DT name NN of IN a DT file NN , , or CC the DT abbreviation NN for IN a DT system NN privilege NN . SENT Monospace NP text NN Monospace NP type NN indicates VVZ code NN examples NNS and CC interactive JJ screen NN displays NNS . SENT In IN the DT C NP programming NN language NN , , monospace NN type NN in IN text NN identifies VVZ the DT following VVG elements NNS . SENT keywords NNS , , the DT names NNS of IN independently RB compiled VVN external JJ functions NNS and CC files NNS , , syntax NN summaries NNS , , and CC references NNS to TO variables NNS or CC identifiers NNS introduced VVN in IN an DT example NN . SENT A DT hyphen NN at IN the DT end NN of IN a DT command NN format NN description NN , , command NN line NN , , or CC code NN line NN indicates VVZ that IN the DT command NN or CC statement NN continues VVZ on IN the DT following VVG line NN . SENT numbers NNS All DT numbers NNS in IN text NN are VBP assumed VVN to TO be VB decimal JJ unless IN otherwise RB noted VVN . SENT Nondecimal JJ radixes NNS binary JJ , , octal NN , , or CC hexadecimal NN are VBP explicitly RB indicated VVN . SENT Chapter NP 1 CD Performance NP Management NP Managing NP system NN performance NN involves VVZ being VBG able JJ to TO evaluate VV and CC coordinate VV system NN resources NNS and CC workload NN demands NNS . SENT A DT system NN resource NN is VBZ a DT hardware NN or CC software NN component NN or CC subsystem NN under IN the DT direct JJ control NN of IN the DT operating NN system NN , , which WDT is VBZ responsible JJ for IN data NN computation NN or CC storage NN . SENT The DT following VVG subsystems NNS are VBP system NN resources NNS . SENT CPU NN Memory NP Disk NN I NP O NP Network NP I NP O NP LAN NP I NP O NP Internet NP I NP O NP Cluster NP communication NN other JJ than IN LAN NP CI NP , , FDDI NP , , MC NP In IN addition NN to TO this DT manual JJ , , specific JJ cluster NN information NN can MD be VB found VVN in IN the DT Guidelines NNS for IN OpenVMS NP Cluster NP Configurations NNS and CC the DT OpenVMS NP Cluster NP Systems NPS . SENT Performance NN management NN means VVZ optimizing VVG your PP$ hardware NN and CC software NN resources NNS for IN the DT current JJ work NN load NN . SENT This DT involves VVZ performing VVG the DT following VVG tasks NNS . SENT Acquiring VVG a DT thorough JJ knowledge NN of IN your PP$ work NN load NN and CC an DT understanding NN of IN how WRB that DT work NN load NN exercises VVZ the DT system's JJ resources NNS Monitoring VVG system NN behavior NN on IN a DT routine JJ basis NN in IN order NN to TO determine VV when WRB and CC why WRB a DT given VVN resource NN is VBZ nearing VVG capacity NN Investigating VVG reports NNS of IN degraded VVN performance NN from IN users NNS Planning NP for IN changes NNS in IN the DT system NN work NN load NN or CC hardware NN configuration NN and CC being VBG prepared VVN to TO make VV any DT necessary JJ adustments NNS to TO system NN values NNS Performing VVG certain JJ optional JJ system NN management NN operations NNS after IN installation NN To TO help VV you PP understand VV the DT scope NN and CC interrelationship NN of IN these DT issues NNS , , this DT chapter NN covers VVZ the DT following VVG topics NNS . SENT A DT review NN of IN workload NN management NN concepts NNS Guidelines NNS for IN developing VVG a DT performance NN management NN strategy NN Because IN many JJ different JJ networking NN options NNS are VBP available JJ , , network NN I NN O NN is VBZ not RB formally RB covered VVN in IN this DT manual JJ . SENT General JJ performance NN concepts NNS discussed VVD here RB apply VV to TO networking NN , , and CC networking NN should MD be VB considered VVN within IN the DT scope NN of IN analyzing VVG any DT system NN performance NN problem NN . SENT You PP should MD consult VV the DT documentation NN available JJ for IN the DT specific JJ products NNS that IN you PP have VHP installed VVN for IN specific JJ guidelines NNS concerning VVG configuration NN , , monitoring NN , , and CC diagnosis NN of IN a DT networking NN product NN . SENT Similarly RB , , database NN products NNS are VBP extremely RB complex JJ and CC perform VV much RB of IN their PP$ own JJ internal JJ management NN . SENT The DT settings NNS of IN parameters NNS external JJ to TO OpenVMS NP may MD have VH a DT profound JJ effect NN upon IN how WRB efficiently RB OpenVMS NP is VBZ used VVN . SENT Thus RB , , reviewing VVG server NN application NN specific JJ material NN is VBZ a DT must MD if IN you PP are VBP to TO efficiently RB understand VV and CC resolve VV a DT related JJ performance NN issue NN . SENT 1 LS . SENT 1 CD System NP Performance NP Management NP Guidelines NNS Even RB if IN you PP are VBP familiar JJ with IN basic JJ concepts NNS discussed VVN in IN this DT section NN , , there EX are VBP some DT details NNS discussed VVN that IN are VBP specific JJ to TO this DT process NN , , so RB please VVP read VV the DT entire JJ section NN . SENT 1 LS . SENT 1 LS . SENT 1 LS The DT Performance NP Management NP Process NN Long NP term NN measurement NN and CC observation NN of IN your PP$ system NN is VBZ key JJ to TO understanding NN how WRB well RB it PP is VBZ working VVG and CC is VBZ invaluable JJ in IN identifying VVG potential JJ performance NN problems NNS before IN they PP become VVP so RB serious JJ that IN the DT system NN grinds VVZ to TO a DT halt NN and CC it PP negatively RB affects VVZ your PP$ business NN . SENT Thus RB , , performance NN management NN should MD be VB a DT routine JJ process NN of IN monitoring VVG and CC measuring VVG your PP$ systems NNS to TO assure VV good JJ operation NN through IN deliberate JJ planning NN and CC resource NN management NN . SENT Waiting VVG until IN a DT problem NN cripples NNS a DT system NN before IN addressing VVG system NN performance NN is VBZ not RB performance NN management NN , , rather RB it PP is VBZ crisis NN management NN . SENT Performance NN management NN involves VVZ . SENT Systematically RB measuring VVG the DT system NN Gathering VVG and CC analyzing VVG the DT data NNS Evaluating VVG trends NNS Archiving JJ data NNS to TO maintain VV a DT performance NN history NN You PP will MD often RB observe VV trends NNS and CC thus RB be VB able JJ to TO address VV performance NN issues NNS before IN they PP become VVP serious JJ and CC adversely RB affect VV your PP$ business NN operations NNS . SENT Should MD an DT unforeseen JJ problem NN occur VV , , your PP$ historical JJ data NNS will MD likely RB prove VV invaluable JJ for IN pinpointing VVG the DT cause NN and CC rapidly RB and CC efficiently RB resolving VVG the DT problem NN . SENT Without IN past JJ data NNS from IN your PP$ formerly RB well RB running VVG system NN , , you PP may MD have VH no DT basis NN upon IN which WDT to TO judge VV the DT value NN of IN the DT metrics NNS you PP can MD collect VV on IN your PP$ currently RB poorly RB running VVG system NN . SENT Without IN historical JJ data NNS you PP are VBP guessing VVG . SENT resolution NN will MD take VV much RB longer RBR and CC cost VV far RB more RBR . SENT Upgrades NNS and CC Reconfigurations NNS Some DT systems NNS are VBP so RB heavily RB loaded VVN that IN the DT cost NN of IN additional JJ functionality NN of IN new JJ software NN can MD push VV the DT system NN beyond IN the DT maximum JJ load NN that IN the DT system NN was VBD intended VVN to TO handle VV and CC thus RB deliver VV unacceptable JJ response NN times NNS and CC throughput NN . SENT If IN your PP$ system NN is VBZ running VVG near IN its PP$ limit NN now RB during IN peak JJ workload NN periods NNS , , you PP want VVP to TO ensure VV that IN you PP take VVP the DT steps NNS necessary JJ to TO avoid VV pushing VVG your PP$ system NN beyond IN its PP$ limits NNS when WRB you PP cannot VV afford VV it PP . SENT If IN your PP$ system NN is VBZ not RB a DT finely RB tuned VVN , , well RB running VVG machine NN , , you PP are VBP advised VVN to TO use VV caution NN when WRB considering VVG changes NNS to TO anything NN . SENT Your PP$ system NN is VBZ already RB being VBG pushed VVN to TO , , or CC beyond IN , , its PP$ original JJ designed VVN capacity NN if IN you PP have VHP observed VVN users NNS complaining VVG about RB . SENT Slow JJ response NN times NNS Erratic JJ system NN behavior NN Unexplained JJ system NN pauses NNS , , hangs VVZ , , or CC crashes NNS If IN this DT is VBZ the DT case NN , , you PP need VVP a DT performance NN audit NN to TO determine VV your PP$ current JJ workload NN and CC the DT resources NNS necessary JJ to TO adequately RB support VV your PP$ current JJ and CC possibly RB future JJ workloads NNS . SENT Implementing VVG changes NNS not RB specifically RB designed VVN to TO increase VV such PDT a DT system's JJ capacity NN or CC reduce VV its PP$ workload NN can MD degrade VV performance NN further RBR . SENT Thus RB , , investing VVG in IN a DT performance NN audit NN will MD pay VV off RP by IN delivering VVG you PP a DT more RBR reliable JJ , , productive JJ , , available JJ , , and CC lower JJR maintenance NN system NN . SENT Many JJ factors NNS involved VVN in IN upgrades NNS and CC reconfigurations NNS contribute VVP to TO increased VVN resource NN consumption NN . SENT Future JJ workloads NNS your PP$ system NN will MD be VB asked VVN to TO support VV may MD be VB unforseeable JJ due RB to TO changes NNS in IN the DT system NN , , workload NN , , and CC business NN . SENT Blind JJ reconfiguration NN without IN measurement NN , , analysis NN , , modification NN , , and CC contingency NN plans NNS can MD result VV in IN serious JJ problems NNS . SENT Significant JJ increases NNS in IN CPU NN , , disk NN , , memory NN , , and CC LAN NP utilization NN demand NN serious JJ consideration NN , , measurement NN , , and CC planning VVG for IN additional JJ workload NN and CC upgrades NNS . SENT 1 LS . SENT 1 LS . SENT 2 CD Conducting VVG a DT Performance NP Audit NP The DT goals NNS of IN a DT performance NN audit NN are VBP to TO . SENT Evaluate VV whether IN your PP$ systems NNS are VBP viable JJ candidates NNS for IN proposed VVN changes NNS . SENT Identify VV modifications NNS that WDT must MD be VB made VVN . SENT Insure VV that DT planned VVN and CC implemented VVN changes NNS deliver VV expected VVN results NNS . SENT A DT proper JJ performance NN audit NN will MD . SENT Characterize VV CPU NN , , disk NN , , memory NN , , and CC LAN NP utilization NN on IN the DT systems NNS under IN consideration NN before IN reconfiguration NN . SENT Measure NN system NN activity NN after IN an DT installation NN . SENT Without IN scientific JJ measurement NN before IN installation NN and CC modification NN , , as RB well RB as RB after IN , , you PP will MD not RB acquire VV the DT data NNS necessary JJ to TO understand VV , , plan NN for IN , , and CC resolve VV potential JJ problems NNS in IN the DT immediate JJ as RB well RB as IN distant JJ future NN . SENT Keep VV the DT following NN in IN mind NN . SENT Measure NN , , plan NN , , understand VV , , test VV , , and CC confirm VV . SENT To TO understand VV how WRB system NN workloads NNS vary VVP , , you PP should MD perform VV measurements NNS for IN one CD week NN , , if IN not RB longer JJR , , before IN installing VVG your PP$ network NN Take VV into IN account NN that IN workloads NNS follow VVP business NN cycles NNS which WDT vary VVP predictably RB throughout IN the DT day NN , , the DT week NN , , the DT month NN , , and CC the DT year NN . SENT These DT variations NNS may MD be VB affected VVN by IN financial JJ and CC legal JJ deadlines NNS as RB well RB as IN seasonal JJ factors NNS such JJ as IN holidays NNS and CC other JJ cyclic JJ activity NN . SENT Seek VV to TO identify VV periods NNS of IN peak JJ heavy JJ loads NNS relatively RB long JJ periods NNS of IN heavy JJ load NN lasting VVG approximately RB five CD or CC more JJR minutes NNS . SENT Understanding VVG their PP$ frequency NN and CC the DT factors NNS affecting VVG them PP is VBZ key JJ to TO successful JJ system NN planning NN and CC management NN . SENT Peak NN Workloads NNS and CC the DT Cyclic JJ Nature NN of IN Workloads NNS You PP must MD first RB identify VV periods NNS of IN activity NN during IN which WDT you PP cannot NN afford VV to TO have VH system NN performance NN degrade VV and CC then RB measure VV overall JJ system NN activity NN during IN these DT periods NNS . SENT These DT periods NNS will MD vary VV from IN system NN to TO system NN minute NN to TO minute NN , , hour NN to TO hour NN , , day NN to TO day NN , , week NN to TO week NN , , and CC month NN to TO month NN . SENT Holidays NNS and CC other JJ such JJ periods NNS are VBP often RB significant JJ factors NNS and CC should MD be VB considered VVN . SENT These DT periods NNS depend VVP upon IN the DT business NN cycles NNS that IN the DT system NN is VBZ supporting VVG . SENT If IN the DT periods NNS you PP have VHP identified VVN as IN critical JJ cannot NN be VB measured VVN at IN this DT time NN , , then RB measurements NNS taken VVN in IN the DT immediate JJ future NN will MD have VH to TO be VB used VVN as IN the DT basis NN for IN estimates NNS of IN the DT activity NN during IN those DT periods NNS . SENT In IN such JJ cases NNS you PP will MD have VH to TO take VV measurements NNS in IN the DT near JJ term NN and CC make VV estimates NNS based VVN on IN the DT data NNS you PP collect VVP in IN combination NN with IN other JJ data NNS such JJ as IN order NN rates NNS from IN the DT previous JJ calendar NN month NN or CC year NN , , as RB well RB as IN projections NNS or CC forecasts NNS . SENT But CC factors NNS other JJ than IN the DT CPU NN may MD become VV a DT bottleneck NN and CC slow VV down RP the DT system NN . SENT For IN example NN , , a DT fixed JJ number NN of IN assistants NNS can MD only RB process VV so RB many JJ orders NNS per IN hour NN , , regardless RB of IN the DT number NN of IN callers NNS waiting VVG on IN the DT phone NN for IN service NN . SENT 1 LS . SENT 2 CD Strategies NNS and CC Procedures NNS This DT manual JJ describes VVZ several JJ strategies NNS and CC procedures NNS for IN evaluating VVG performance NN , , evaluating VVG system NN resources NNS , , and CC diagnosing VVG resource NN limitations NNS as RB shown VVN in IN the DT following VVG list NN . SENT Develop VV workload NN strategy NN Chapter NP 1 CD Managing VVG the DT work NN load NN Distributing VVG the DT work NN load NN Sharing VVG application NN code NN Develop VV tuning VVG strategy NN Chapter NP 2 CD Automatic NP Working NP Set VVD Adjustment NN AWSA NP AUTOGEN NP Active JJ memory NN management NN Perform VV general JJ system NN resource NN evaluation NN Chapter NP 4 CD CPU NN resource NN Memory NP resource NN Disk NN I NP O NP resource NN Conduct NP a DT preliminary JJ investigation NN of IN specific JJ resource NN limitations NNS Chapter NN 5 CD Isolating JJ memory NN resource NN limitations NNS Isolating VVG disk NN I NN O NN resource NN limitations NNS Isolating VVG CPU NN resource NN limitations NNS Review NP techniques NNS for IN improving VVG system NN resource NN responsiveness NN Chapter NP 6 CD Providing VVG equitable JJ sharing NN of IN resources NNS Reducing VVG resource NN consumption NN Ensuring VVG load NN balancing NN Initiating VVG offloading VVG Apply VV specific JJ remedy NN to TO compensate VV for IN resource NN limitations NNS Chapter NN 10 CD Compensating VVG for IN memory NN limited JJ behavior NN Compensating VVG for IN I PP O NN limited JJ behavior NN Compensating VVG for IN CPU NN limited JJ behavior NN 1 CD . SENT 3 CD System NP Manager's NP Role NN As IN a DT system NN manager NN , , you PP must MD be VB able JJ to TO do VV the DT following NN . SENT Assume VV the DT responsibility NN for IN understanding VVG the DT system's JJ work NN load NN sufficiently RB to TO be VB able JJ to TO recognize VV normal JJ and CC abnormal JJ behavior NN . SENT Predict VV the DT effects NNS of IN changes NNS in IN applications NNS , , operations NNS , , or CC usage NN . SENT Recognize VV typical JJ throughput NN rates NNS . SENT Evaluate VV system NN performance NN . SENT Perform VV tuning VVG as RB needed VVN . SENT 1 LS . SENT 3 LS . SENT 1 CD Prerequisites NNS Before IN you PP adjust VVP any DT system NN parameters NNS , , you PP should MD . SENT Be VB familiar JJ with IN system NN tools NNS and CC utilities NNS . SENT Know VV your PP$ work NN load NN . SENT Develop VV a DT strategy NN for IN evaluating VVG performance NN . SENT 1 LS . SENT 3 LS . SENT 2 CD System NP Utilities NPS and CC Tools NP You PP can MD observe VV system NN operation NN using VVG the DT following VVG tools NNS . SENT Accounting NN utility NN ACCOUNTING NP Audit NP Analysis NP utility NN ANALYZE VV AUDIT NN Authorize VV utility NN AUTHORIZE VV AUTOGEN NP command NN procedure NN DCL NP SHOW NN commands VVZ DECamds NP Compaq NP Availability NN Manager NP DECevent NP utility NN Alpha NP only JJ Error NN Log NN utility NN ANALYZE VV ERROR NN LOG NN Monitor NP utility NN MONITOR NN On IN Alpha NP platforms NNS , , Compaq NP recommends VVZ using VVG the DT DECevent NP utility NN instead RB of IN the DT Error NN Log NN utility NN , , ANALYZE VV ERROR NN LOG NN . SENT You PP invoke VV the DT DECevent JJ utility NN with IN the DT DCL NP command NN , , DIAGNOSE VV . SENT You PP can MD use VV ANALYZE VV ERROR NN LOG NN on IN Alpha NP systems NNS , , but CC the DT DECevent NP utility NN provides VVZ more RBR comprehensive JJ reports NNS . SENT Next JJ Contents NNS Index NP Privacy NN statement NN Using VVG this DT site NN means VVZ you PP accept VV its PP$ terms NNS Feedback NN to TO webmaster VV 2004 CD Hewlett NP Packard NP Development NP Company NP , , L NP . SENT P NN . SENT