Dell P01E, P776N manual Working With RAID, RAID Level

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Working With RAID

A redundant array of independent disks (RAID) is a disk storage configuration that increases performance or data redundancy. There are two basic RAID levels discussed in this section.

•RAID level 0 is recommended for higher performance (faster throughput).

•RAID level 1 is recommended for users who need a high level of data integrity.

NOTE: RAID requires multiple hard drives. The number of hard drives required varies depending on the RAID configuration.

RAID Level 0

CAUTION: RAID level 0 provides no redundancy. Therefore, a failure of one drive results in the loss of all data. Perform regular backups to protect your data.

RAID level 0 uses data striping to provide a high data access rate. Data striping writes consecutive segments, or stripes, of data sequentially across the physical drive(s) to create a large virtual drive. This allows one of the drives to read data while the other drive is searching for and reading the next block.

CHAPTER 4: USING YOUR NOTEBOOK

RAID 0 uses the full storage capacities of both drives. For example, two 2 GB hard drives combine to provide 4 GB of hard drive space on which to store data.

NOTE: In a RAID 0 configuration, the size of the configuration is equal to the size of the smallest drive multiplied by the number of drives in the configuration.

RAID Level 1

RAID level 1 uses data mirroring to enhance data integrity. When data is written to the primary drive, the data is also duplicated, or mirrored, on the secondary drive in the configuration. RAID 1 sacrifices high data-access rates for data redundancy.

If a drive failure occurs, read and write operations are directed to the remaining drive. A replacement drive can then be rebuilt using the data from the remaining drive.

NOTE: In a RAID 1 configuration, the size of the configuration is equal to the size of the smallest drive in the configuration.

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Contents Alienware M17x Mobile Manual 02/02 Contents 04 /04 Introduction Setting UP Your Notebook Before Setting Up Your NotebookLocation and Positioning of Your Notebook Setting Up Your Alienware MobileProduct Documentation and Media Connect the AC Adapter to the Back of Your NotebookConnecting to a Home Network Press the Power Button Windows Vista SetupConnecting to the Internet Getting to Know Your Examining Your Notebook Front View Features Back View FeaturesLeft View Features Right View FeaturesTop View Features Bottom View Features Power Button Status LEDsTouch Controls Function KeysF5 Decrease Display Brightness Removing and Replacing the Battery Pack Battery PackRecharging the Battery Pack Battery Maintenance Questions and AnswersCustomizing Your Notebook’s Power Settings Power ManagementUnderstanding Power Consumption Reducing Power ConsumptionConnecting Devices Extending the Desktop Connecting External DisplaysConnecting a Display Connecting External Speakers Connecting FireWire Ieee 1394 Devices Connecting PrintersConnecting USB Devices Connecting a Plug and Play PrinterUsing Your Notebook Alienware Command CenterUsing the Optical Drive Stealth ModeUsing Removable Media and Cards Using the Integrated WebcamWorking With RAID RAID LevelEntering System Setup Configuring the BiosSystem Setup System Setup ScreensSystem Setup Options Sata ODDAdvanced Menu USB Emulation Graphics Settings Sub-Menu Hybrid Graphics Cmos Installing Additional Or Replacement Components Before Working Inside Your Notebook Before You BeginTurning Off Your Notebook Upgrading/Replacing Memory Removing the Memory Modules Compartment door Front of the notebook Captive screwsMemory module connector Spring locks Tab Notch Upgrading/Replacing Hard Drives Removing the Hard Drives038 /038 Secondary Hard Drive HDD1 Troubleshooting Basic Hints and TipsBackup and General Maintenance Things to check before troubleshootingSoftware Diagnostic Tools Pre-Boot System Assessment PSAAlienware Diagnostics Starting Alienware Diagnostics From the Support CD/DVDAn audio CD does not produce sound Answers to Common ProblemsComputer does not recognize the disc or drive DVD or Blu-ray movie does not playComputer stops responding/a solid blue screen appears SystemComputer fails the Post Program stops responding or crashes repeatedlyHard Drive Problems Other software problemsMemory InternetKeyboard If the display is difficult to read MonitorIf the display is blank Printer PowerMouse Game ControllersSpeakers There is no sound from the speakers externalSystem Recovery AlienRespawn Using AlienRespawnMicrosoft System Restore Factory System Recovery Password ProtectionAdvanced Recovery To Enable or Change Password SettingsAlienRespawn v2.0 Disc To Use the AlienRespawn v2.0 DiscBasic Specifications USB 057/057 General Safety Precautions Appendix a General and Electrical Safety PrecautionsComputer Setup Computer UseWhen You Should Contact Alienware Replacement Components or AccessoriesWhen setting up the equipment for use General Safety InformationWhen operating your equipment Protecting Against Electrostatic Discharge When Working Inside Your DeviceGeneral Power Safety If your computer uses an AC adapterPortable Device Battery Safety TV Antenna Safety InstructionsErgonomic Instructions Example of Antenna GroundingRecycling Information Battery DisposalEnvironmental Considerations Waste Electrical and Electronic Equipment Weee DirectivePerchlorate Material For Products With Wireless LAN / 802.11 InterfacesExport Regulations Restrictions of Usage InformationItaly Restriktioner af brugsinformationFrance For produkter med trådløs LAN / 802.11 grænsefladeInformatie over beperkingen in gebruik Informations sur les restrictions relatives à l’utilisationItalie Per prodotti con interfacce wireless LAN/802.11Informazioni sulle limitazioni all’uso FranciaItalia Restriksjoner på brukerinformasjonИнформация об ограничении на использование For produkter med trådløse LAN / 802.11-nettverkskortRestricciones sobre la información de uso Para productos con interfaces LAN inalámbricasDanmark Other Country Specific InformationEuropean Union United StatesNorge Sverige依照商品檢驗法案第 11 條條文，Dell 提供對於本文件所涉及產品在台灣地區認證機構的公司聯絡細節 Information Terms and Conditions of Sale075/075 THEREUNDER, or ANY CLAIM, Dispute or Controversy Whether Other Documents Retail Purchaser End User AgreementSoftware Return Policies ExchangesNot For Resale or Export Governing Law Service and SupportLimitation of Liability Limited Warranties and Return Policy What is covered by this limited hardware warranty?What is not covered by this limited hardware warranty? Binding ArbitrationHow long does this limited hardware warranty last? What do I do if I need warranty service? What will Dell do?Dell Return Policy U.S. Only What if I purchased a service contract?May I transfer the limited hardware warranty? How will you fix my product?083/083 084/084 085 /085 Dell Return Policy Canada Only Exceptions to Dell’s 30-day return policyDell and Alienware Software and Peripherals Canada Only Third-Party Software and Peripherals ProductsLimited Warranty Appendix D Dell Software License AgreementGeneral Open Source SoftwareGovernment Restricted Rights Appendix E Contacting Alienware WebsitesAppendix F Important Information Printed on recycled paper