Dell S100, S300 manual Spanned RAID Levels, Parity Data

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NOTE: Mirrored physical disks improve read performance by read load balancing.

NOTE: The PERC S300 controller only supports physical disks (SAS and SATA). SSD devices cannot be migrated to a PERC S300 controller.

Figure 2-2. Example of Disk Mirroring (RAID 1)

Stripe element 1 Stripe element 1 Duplicated

Stripe element 2 Stripe element 2 Duplicated

Stripe element 3 Stripe element 3 Duplicated

Stripe element 4 Stripe element 4 Duplicated

Spanned RAID Levels

Spanning is a term used to describe the way in which RAID level 10 is constructed from multiple sets of simpler RAID levels. For example, a RAID 10 has multiple sets of RAID 1 disk arrays in which each RAID 1 set is considered a span. Data is then striped (as it is in RAID 0) across the RAID 1 spans to create a RAID 10 virtual disk.

Parity Data

Parity data is redundant data that has been generated to provide fault tolerance within certain RAID levels. In the event of a drive failure, the parity data can be used by the controller to regenerate user data. Parity data is present only for RAID 5 disk arrays.

The parity data is distributed across all the physical disks in the system. If a single physical disk fails, it can be rebuilt from the parity and the data on the remaining physical disks. RAID 5 combines distributed parity with disk striping, as shown in Figure 2-3. Parity provides redundancy for one physical disk failure without duplicating the contents of entire physical disks.

Overview

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Contents User’s Guide February Contents Physical Disk-Related Errors Installing the Perc S300 AdapterComplete the Hardware Installation Installing the Microsoft Windows DriversIndustry Canada Notice Canada Only RAID Technology Understanding Disk ArraysContents Page Safety When Working Inside Your System Safety GeneralProtecting Against Electrostatic Discharge Page Introduction OverviewOverview Supported Platforms Physical disks RequirementsOverview Boot to it Summary of RAID Levels About RAIDDisk Striping RAID TerminologyDisk Mirroring Parity Data Spanned RAID LevelsExample of Distributed Parity RAID General Features FeaturesDescription Description Allows hot-swapping Physical disks, in the same virtual disk That supports hot-swapping DisksBackplane with hot-swap capability Features Migration during an OCE Virtual diskSpecifications RAID Before You Begin Hardware InstallationGeneral Considerations Installing the Perc S300 Adapter Installing a Perc S300 Adapter Connecting the Cables Connect Physical Disks to the Perc S300 Adapter Complete the Hardware InstallationHardware Installation Installing the Microsoft Windows Drivers Installing the DriversDownloading the Controller Driver Media Operating System And Device Driver Media Pre-Installation Requirements for the Controller DriversTo Use Sata Controller to either ATA Mode or Ahci Pre-Installation Procedures For The Controller Drivers Steps DVD, and so on, perform the following For Microsoft Windows Server 2008 and Windows Server 2008 R2 For Microsoft Windows Server For Microsoft Windows Server 2008 and Windows Server 2008 R2 Installing the Drivers Installing the Drivers Perc Virtual Disk Management Utility Operations Description RAID Configuration ManagementAccessing the Perc Virtual Disk Management Utility Perc Virtual Disk Management Text Colors Description Initializing Physical Disks Before You Begin Creating Virtual DisksRAID Configuration and Management Deleting Virtual Disks RAID Configuration and Management Swapping Two Virtual Disks Create a Global Hot Spare Managing Global Hot SparesDelete a Global Hot Spare Viewing Virtual Disk Details Viewing Physical Disk DetailsRescanning Disks Controller Options Description How to OperateController Options Pause if Degraded Continuing to BootRAID Configuration and Management System Startup Problems TroubleshootingRAID Mode to ATA Mode Boot Mode, Boot Sequence Bios Bios Screen Corrective Action Lost This warning message appears when multiple virtual disks are This warning message appears when From virtual disk creation Virtual Disk-Related Errors A Virtual Disk is in a Failed State On the virtual diskRedundant virtual disk 12. Cannot Create a Global Hot Spare Select View Virtual Disk Details 14. a Dedicated Hot Spare Fails Physical Disk-Related ErrorsTroubleshooting S300 adapter Controller SpecificationsAppendix a Read, Write, and Cache PolicyPerc S300 adapter Controller TasksPhysical Disk Tasks Table A-3. Physical Disk Tasks Physical Disk Task NameAdapter Virtual Disk TasksSupported RAID Levels Table A-4. Virtual Disk Tasks Virtual Disk Task NameVirtual Disk Specifications RAID Technology Understanding Disk Arrays and Virtual Disks Appendix BUnderstanding RAID Levels Appendix B Table B-2. Physical Disk States Definition Disk States Virtual and Physical DisksTable B-3. Virtual Disk States State Definition Failure StatesPhysical Disk States Table B-5. Minimum and Maximum Physical Disk ConfigurationsCreating Virtual Disks Future Expansion Understanding Physical DisksRescanning Physical Disks for Changes in State Dedicated Hot SparesGlobal Hot Spares Regulatory Notices Appendix CFCC, Class a FCC Notice U.S. OnlyFCC, Class B Industry Canada, Class B Industry Canada Notice Canada OnlyCE Notice European Union Industry Canada, Class aAppendix C CE Mark Notice Contacting Dell Appendix DAppendix D Index Index Index 100 101 102 103 Glossary104 105 106 Acronym for nanoseconds, one billionth of a second 107108 109 110
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