HP Microsoft Windows Server 2003 for Itanium-based Systems manual Drive arrays

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Drive arrays and fault-tolerance methods

In this section
Drive arrays	58
Fault-tolerance methods	60

Drive arrays

The capacity and performance of a single physical (hard) drive is adequate for home users. However, business users demand higher storage capacities, higher data transfer rates, and greater protection against data loss when drives fail.

Connecting extra physical drives (Pn in the figure) to a system increases the total storage capacity but has no effect on the efficiency of read/write (R/W) operations. Data can still be transferred to only one physical drive at a time.

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Contents HP Array Configuration Utility User Guide Audience assumptions Contents Diagnosing array problems Getting started Features and system requirementsInstalling ACU This sectionSetting the execution mode for Microsoft Windows Overview for using ACUComparison of ACU execution modes Opening ACU in Local Application mode Choosing an operating modeOpening ACU in Browser mode Http//servername2301Opening ACU through Systems Insight Manager Select Device QueriesTypical Standard mode screen GUI operating modesTypical Configuration Wizards mode screen Completing the configuration process Typical Express Configuration mode screenUsing Standard Configuration mode Configuring a new controllerPossible tasks in Standard Configuration mode Using Express Configuration mode Click Finish Using the configuration wizardsCreating an array Click Create an array, and then click BeginConfiguring a new controller Creating a logical drive Click Create a logical drive, and then click BeginConfiguring a new controller Modifying a configuration using Standard Configuration mode Modifying an existing configurationChoices available after opening ACU Clear Configuration Modifying a configuration using Express modeModifying a configuration using the Configuration wizards Click Express Configuration, and then click BeginClick Controller Settings, and then click Begin Controller settingsCreate an array Create a logical drive Delete arrays Expand Array Delete logical drivesClick Delete logical drives, and then click Begin Click Extend logical drive, and then click Begin Extend logical driveMigrate a logical drive Click Migrate a logical drive, and then click BeginRA4x00 controllers Spare managementSelective Storage Presentation Click Spare Management, and then click BeginMSA and Smart Array Cluster storage controllers Configuring switches Click ACU Switch ConfigurationSplitting a mirrored array Recombining a split, mirrored arrayModifying an existing configuration Introduction to scripting in ACU Command line syntaxScripting in ACU Operating modesSample custom input script Cpqacuxe -i FilenameScript file options Description of option categories in ACU scriptingAction Control categoryController category MethodLicenseKey, DeleteLicenseKey ClearConfigurationWithDataLossController RAIDArrayIDRebuildPriority, ExpandPriority SurfaceScanDelayArray category SSPStateDrive Logical Drive categoryOnlineSpare LogicalDriveStripeSize SizeSectors ArrayAcceleratorConnectionName Error reportingSSPAdaptersWithAccess HostModeACU scripting error messages 0-9, !, @, #, *, , , ,, -, , +, , ., /, and space. The ID Current configuration Overview of the ACU CLI Using the Command Line InterfaceRunning the CLI Keyword abbreviations Command variableCLI syntax Target variableHiding warning prompts Typical proceduresExample command Querying a deviceSample scenario SyntaxModifying the controller chassis name Example commandsExample Using Selective Storage Presentation Sample scenarioModifying connection names Managing host modes connection profilesExpanding an array Deleting target devicesIdentifying devices Extending a logical driveMigrating a logical drive Target modify raid=01+0156adg? ss=8163264128256default?Managing spare drives Target modify size=#max? forcedChanging the Expand Priority setting Changing the Rebuild Priority settingChanging the controller cache ratio Re-enabling a failed logical drive Changing the surface scan delay timeEnabling or disabling the drive cache Disabling a redundant controller Setting the targetEnabling or disabling the array accelerator Typical scenarioRescanning the system = rescanProbability of logical drive failure Factors involved in logical drive failureProbability of logical drive failure Drive arrays and fault-tolerance methods Drive arraysDrive arrays and fault-tolerance methods Fault-tolerance methods Hardware-based fault-tolerance methodsAdvantages RAID 0-No fault toleranceDisadvantages RAID 1+0-drive mirroring RAID 5-distributed data guarding RAID 6 ADG-Advanced Data GuardingComparing the hardware-based RAID methods RAID RAID 6 ADGAlternative fault-tolerance methods Selecting a RAID methodServer Diagnostics Diagnosing array problemsDiagnostic tools Post messagesAcronyms and abbreviations SSP Index Index