how to configure op on the kingston dc400 ssd · 2016. 9. 6. · performance gains to expect from...

kingston.com How to configure OP on the Kingston DC400 SSD Kingston realizes datacenter use of SSD’s cannot be a one-size-fits-all approach. Some applications are more read intensive and others more write intensive. Some applications will require an extended service life so endurance will be a key consideration. For DC400, Kingston has made it possible for a user to manually configure the OP on their SSD to best fit the goals of the application and/or workload. The Kingston Storage Manager (KSM) is a Windows-based graphical user interface designed to make configuring OP on the DC400 quick and easy. The DC400 line of SSD’s is manufactured with a standard OP configuration of approximately 7% from the factory. For example a 960GB DC400 actually has 1024GB of Flash Memory on the PCB but after Kingston configures the 7% OP at manufacturing time the user has 960GB of usable capacity available to them. With KSM, the user can set any amount of OP they desire above the factory set OP configuration which will increase the OP space available to the controller above the standard 7% OP . If at a later time the required expectation of the drives change and more useable capacity is needed, the user can simply adjust the OP for more usable capacity or set the drive back to the factory OP configuration. Note: Any change in the OP configuration will result in data loss. Figure 1 below shows an example of the “Operations Tab” in KSM where OP can be configured on a DC400. In this example we are beginning with a DC400 with a default factory configuration of 960GB. The user will simply enter the user capacity they desire in GB in the “desired capacity settings box” and commit their changes. Figure 1

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kingston.com

HowtoconfigureOPontheKingstonDC400SSD

KingstonrealizesdatacenteruseofSSD’scannotbeaone-size-fits-allapproach.Someapplicationsaremorereadintensiveandothersmorewriteintensive.Someapplicationswillrequireanextendedservicelifesoendurancewillbeakeyconsideration.ForDC400,KingstonhasmadeitpossibleforausertomanuallyconfiguretheOPontheirSSDtobestfitthegoalsoftheapplicationand/orworkload.

TheKingstonStorageManager(KSM)isaWindows-basedgraphicaluserinterfacedesignedtomakeconfiguringOPontheDC400quickandeasy.TheDC400lineofSSD’sismanufacturedwithastandardOPconfigurationofapproximately7%fromthefactory.Forexamplea960GBDC400actuallyhas1024GBofFlashMemoryonthePCBbutafterKingstonconfiguresthe7%OPatmanufacturingtimetheuserhas960GBofusablecapacityavailabletothem.

WithKSM,theusercansetanyamountofOPtheydesireabovethefactorysetOPconfigurationwhichwillincreasetheOPspaceavailabletothecontrollerabovethestandard7%OP.Ifatalatertimetherequiredexpectationofthedriveschangeandmoreuseablecapacityisneeded,theusercansimplyadjusttheOPformoreusablecapacityorsetthedrivebacktothefactoryOPconfiguration.Note:AnychangeintheOPconfigurationwillresultindataloss.

Figure1belowshowsanexampleofthe“OperationsTab”inKSMwhereOPcanbeconfiguredonaDC400.InthisexamplewearebeginningwithaDC400withadefaultfactoryconfigurationof960GB.TheuserwillsimplyentertheusercapacitytheydesireinGBinthe“desiredcapacitysettingsbox”andcommittheirchanges.

Figure1

Page 2: How to configure OP on the Kingston DC400 SSD · 2016. 9. 6. · Performance gains to expect from different levels of OP For increased performance, a larger over-provisioned area

kingston.com

Figure2showstheconfigurationoftheDC400aftercommittingthenewOPconfiguration.The“currentvalue”of800GBiswhatyouroperatingsystemwillidentifywhentheOSdiskutilityisrunwhencreatingandformattingthenewpartition.TheremaininghiddenOPareawillbeusedbytheSSDcontrollerforallthoseimportantbackgroundoperations.

Figure2

PerformancegainstoexpectfromdifferentlevelsofOP

Forincreasedperformance,alargerover-provisionedareaonanSSDwillprimarilyimprovewriteIOPSperformanceandlowerapplicationlatency.Asageneralguideline,thelargestimprovementsinperformanceareobtainedwithanOPareabetween7%and28%.ConfiguringOPbeyond28%willresultinhigherendurancefortheSSDbuttheperformancebenefitsmaybegintodiminishatthispoint.

BasedontheSNIAstandardizedtestdatabelowyoucanseethattheDC400configuredat400GBdelivers3xthesustainedwriteIOPSperformanceoverastandardDC400configuredat480GB.ApplicationlatencyisalsoreducedwithmoreOPacrosstheread/writeworkloadmix.

Page 3: How to configure OP on the Kingston DC400 SSD · 2016. 9. 6. · Performance gains to expect from different levels of OP For increased performance, a larger over-provisioned area

kingston.com

TheDC400configuredat400GBdelivers3xthewriteIOPSperformance(100%write)thanthedriveconfiguredat480GBand2xtheperformanceina65/35read/writemixedworkload.

OPhelpedtoreduceapplicationlatencybynearlyhalfinboth100%randomwriteandinmixedworkloadtests.

Page 4: How to configure OP on the Kingston DC400 SSD · 2016. 9. 6. · Performance gains to expect from different levels of OP For increased performance, a larger over-provisioned area

kingston.com

EndurancebenefitsofOP

ItiswellknownthatSSD’shaveafinitenumberofprogramanderasecyclesperFlashMemoryCell.Over-provisioningtheDC400SSDcanoffergreaterFlashendurancebyeffectivelyloweringthewriteamplificationfactor.

Theexamplebelowshowsa1TBDC400configuredatboth7%and28%OPandtheirrespectivelifetimewriteendurancemeasuredinterabyteswritten(TBW).TheDC400configuredat800GBcapacitydelivers65%morewriteendurancethanthedriveconfiguredat960GB.

TheDC400configuredat800GBcapacitydelivers65%morewriteendurancethanthedriveconfiguredat960GB.

ClosingThoughts

OP,whilealreadypopularamongSSDenthusiasts,isnowbecomingakeystrategyfordatacentersdeployingFlashbasedstoragetorunhighperformanceserverapplications.WhetherthegoalistuningforperformanceortuningforenduranceOPallowsdatacentersuserstheabilitytofinetunetheirstorageinvestmenttotheirownparticularworkloadand/orproductionlifecyclegoals.ByincreasingperformanceandextendingtheusefullifeoftheSSD,buyerswillnotonlygetmorestorageforeachdollar,butthatstoragewillperformfasterandlastlongerthanotheroptionsavailable.

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