HP Microsoft Windows Server 2003 for Itanium-based Systems specs

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.

Drive arrays and fault-tolerance methods 58

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HP Microsoft Windows Server 2003 for Itanium-based Systems manual Drive arrays and fault-tolerance methods

Contents

HP Array Configuration Utility User Guide Audience assumptions Contents Diagnosing array problems Getting started Features and system requirementsInstalling ACU This section Setting the execution mode for Microsoft Windows Overview for using ACUComparison of ACU execution modes Opening ACU in Local Application mode Choosing an operating mode Opening ACU in Browser mode Http//servername2301 Opening ACU through Systems Insight Manager Select Device Queries Typical Standard mode screen GUI operating modes Typical Configuration Wizards mode screen Completing the configuration process Typical Express Configuration mode screen Using 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 Begin Configuring a new controller Creating a logical drive Click Create a logical drive, and then click Begin Configuring 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 Begin Click 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 Begin RA4x00 controllers Spare managementSelective Storage Presentation Click Spare Management, and then click Begin MSA and Smart Array Cluster storage controllers Configuring switches Click ACU Switch Configuration Splitting a mirrored array Recombining a split, mirrored array Modifying an existing configuration Introduction to scripting in ACU Command line syntaxScripting in ACU Operating modes Sample custom input script Cpqacuxe -i Filename Script file options Description of option categories in ACU scripting Action Control categoryController category Method LicenseKey, DeleteLicenseKey ClearConfigurationWithDataLossController RAIDArrayID RebuildPriority, ExpandPriority SurfaceScanDelayArray category SSPState Drive Logical Drive categoryOnlineSpare LogicalDrive StripeSize SizeSectors ArrayAccelerator ConnectionName Error reportingSSPAdaptersWithAccess HostMode ACU 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 variable Hiding warning prompts Typical proceduresExample command Querying a device Sample scenario Syntax Modifying the controller chassis name Example commandsExample Using Selective Storage Presentation Sample scenario Modifying connection names Managing host modes connection profiles Expanding an array Deleting target devicesIdentifying devices Extending a logical drive Migrating a logical drive Target modify raid=01+0156adg? ss=8163264128256default?Managing spare drives Target modify size=#max? forced Changing 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 scenario Rescanning the system = rescan Probability of logical drive failure Factors involved in logical drive failure Probability of logical drive failure Drive arrays and fault-tolerance methods Drive arrays Drive arrays and fault-tolerance methods Fault-tolerance methods Hardware-based fault-tolerance methods Advantages RAID 0-No fault toleranceDisadvantages RAID 1+0-drive mirroring RAID 5-distributed data guarding RAID 6 ADG-Advanced Data Guarding Comparing the hardware-based RAID methods RAID RAID 6 ADG Alternative fault-tolerance methods Selecting a RAID method Server Diagnostics Diagnosing array problemsDiagnostic tools Post messages Acronyms and abbreviations SSP Index Index