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Dell H810, H710P, H310 manual Disk Mirroring, Spanned RAID Levels, Parity Data

Models: H310 H710 H710P H810

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Disk Mirroring

Disk Mirroring

With mirroring (used in RAID 1), data written to one disk is simultaneously written to another disk. If one disk fails, the contents of the other disk can be used to run the system and rebuild the failed physical disk. The primary advantage of disk mirroring is that it provides complete data redundancy. Both disks contain the same data at all times. Either of the physical disks can act as the operational physical disk.

Disk mirroring provides complete redundancy, but is an expensive option because each physical disk in the system must be duplicated.

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

Figure A-2 shows an example of disk mirroring.

Figure A-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 levels 10, 50, and 60 are constructed from multiple sets of basic, or simple RAID levels. For example, a RAID 10 has multiple sets of RAID 1 arrays where each RAID 1 set is considered a span. Data is then striped (RAID 0) across the RAID 1 spans to create a RAID 10 virtual disk. Similarly, RAID 50 and RAID 60 combine multiple sets of RAID 5 or RAID 6 respectively with striping.

Parity Data

Parity data is redundant data that is generated to provide fault tolerance within certain RAID levels. In the event of a disk failure the parity data can be used by the controller to regenerate user data. Parity data is present for RAID 5, 6, 50, and 60.

Appendix: RAID Description

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Dell H810, H710P, H310 manual Disk Mirroring, Spanned RAID Levels, Parity Data

Contents

User’s Guide Dell PowerEdge RAID Controller PERC H310 H710, H710P, and H810Model UCPA-801, UCPB-800, UCPM-800 and UCPE-800 Notes, Cautions, and WarningsTypes of Virtual Disk Initialization ContentsPhysical Disk Power Management Supported Operating SystemsUsing Persistent Hot Spare Slots 3 Deploying the PERC CardWrite-Back With No Battery is Employed Reconfiguration of Virtual DisksReverting to Single Path Support Setting up Redundant Path SupportInstalling the Windows Drivers Support For InternalVirtual Disk Management 5 Management ApplicationsBIOS Configuration Utility Configuring and Managing UEFI RAID Configuration UtilityCacheCade Virtual Disk Characteristics Security Key Management in the 7 Security Key andTroubleshooting Security Key Errors Security Key ImplementationVirtual Disks Degraded Error Message Missing Disks in Virtual Disk Error MessageMissing Virtual Disks Error Message With Preserved Cache Error MessagePERC Card Not Seen in Device Manager Unable to Rebuild a Fault Tolerant Virtual DiskFatal Error or Data Corruption Reported Degraded State of Virtual DisksLinux Operating System Errors A Appendix RAID DescriptionContents Overview H710P SpecificationH310 H710Supported Operating Systems 3 Select Select a Product in Product Support 4 Select Enter a Tag Related DocumentationContacting Dell 1 Go to support.dell.comPhysical Disk Power Management FeaturesBackground Initialization of Virtual Disks Configured Spin Down DelayTypes of Virtual Disk Initialization Fast Initialization of Virtual Disks Full Initialization of Virtual DisksDisk Roaming Consistency ChecksVirtual Disk Migration Perform the following steps to use disk migration Write-Back and Write-Through Virtual Disk Write Cache PoliciesConditions Under Which Write-Back is Employed Conditions Under Which Forced Write-Back With No Battery is EmployedVirtual Disk Read Cache Policies Reconfiguration of Virtual Disks a mirrored virtual disk by adding one disk Table 2-1. RAID Level MigrationThe SMART Feature Fault ToleranceAutomatic Replace Member with Predicted Failure Patrol ReadRedundant Path Support For PERC H810 Only Physical Disk Hot Swapping Using Persistent Hot Spare SlotsPhysical Disk Failure Detection Controller Cache Preservation Using Replace Member and Revertible Hot SparesTLC Time Frame Battery Transparent Learn CycleCache Data Recovery Cache Preservation With Non-Volatile Cache NVCWhen to Replace the Battery Features Deploying the PERC Card Removing the PERC Controller Installing the PERC ControllerPERC adapter Figure 3-1. Removing and Installing the PERC AdapterSAS cable connectors2 PCIe slotPERC stack-up connector Figure 3-2. Removing and Installing the PERC Mini Blade ControllerPERC mini monolithic controller Support For Internal Multiple ControllersSetting up Redundant Path Support on the PERC H810 Adapter Page storage Figure 3-4. Redundant Path Support Configuration With Two EnclosuresCreating the Driver Media Driver InstallationInstalling the Windows Drivers Downloading Drivers From the Dell Support Website Pre-Installation RequirementsCreating the Device Driver Media 3 Click Continue1 Turn off the system 2 Install the new RAID controller in the system 4 Click Device Manager 8 Select Install from a list or specific locationUpdating Existing Windows Server 2008 or Windows Server 2008 R2 Updating the Linux Driver Installing or Updating the RPM Driver Package With KMOD Support Installing or Updating the RPM Driver Package With DKMS SupportUpgrading the Kernel Installing or Updating the RPM Driver Package With KMP SupportDriver Installation Dell OpenManage Storage Management Management Applications for PERC CardsEntering the BIOS Configuration Utility BIOS Configuration UtilityNotation Exiting the Configuration UtilityMenu Navigation Controls Table 5-1. Menu Navigation KeysMeaning and Use to exit the BIOS Configuration UtilityTable 5-1. Menu Navigation Keys continued NotationMeaning and Use Setting Up Virtual DisksTable 5-1. Menu Navigation Keys continued NotationRAID Level Table 5-2. Virtual Disk Parameters and DescriptionsParameter DescriptionDescription or Adaptive. The default is Adaptive-Read-AheadTable 5-2. Virtual Disk Parameters and Descriptions continued ParameterCreating Virtual Disks Virtual Disk Management10 Select additional disks, if required j Press Tab to move the cursor to Initialize and press Enter Initializing Virtual Disks Converting Physical Disk to RAID Capable for PERC H310Converting Physical Disk to Non-RAID for PERC H310 Checking Data Consistency Importing or Clearing Foreign Configurations Using the VD Mgmt Menu All the physical disks in a configuration are removed and re-inserted a Select Foreign Configuration View to display the Break Mirror Break Mirror in BIOS Configuration Utility 3 Select Manage Preserved Cache Managing Preserved CacheDeleting a dedicated hot spare Managing Dedicated Hot SparesCreating a dedicated hot spare Deleting Disk Groups Deleting Virtual DisksVirtual Disk Management VD Mgmt menu BIOS Configuration Utility Menu OptionsClearing the Configuration 4 Select Clear ConfigVirtual Disks Physical Disks Virtual Disk Management VD MgmtDisk Group # Properties Information Displayed in Right Panelin Left Panel Virtual DisksManagement Applications for PERC Cards Menu Item Selected Information Displayed in Right Panel in Left PanelManagement Applications for PERC Cards Information Displayed in Right Panelin Left Panel Description Virtual Disk ActionsTable 5-4. Virtual Disk Actions ActionPhysical Disk Management PD Mgmt Rebuild Physical Disk ActionsController Management Ctrl Mgmt Option Controller Management ActionsConfiguration Utility CtrlR Table 5-8. Controller Management OptionsPhysical Disk Management Foreign Configuration ViewSetting LED Blinking Removing Global or Dedicated Hot Spares Creating Global Hot SparesReplacing an Online Physical Disk Restrictions and Limitations Stopping Background InitializationPerforming a Manual Rebuild of an Individual Physical Disk Enabling Boot SupportController Management Enabling BIOS Stop on Error Enabling Auto Import Entering the UEFI RAID Configuration Utility UEFI RAID Configuration UtilityRestoring Factory Default Settings Configuration Options Exiting the UEFI RAID Configuration UtilityController Management Physical Disk Management Virtual Disk ManagementEnclosure Management CacheCade CacheCade Virtual Disk CharacteristicsCacheCade Virtual Disk Management Configuring and Managing CacheCade Virtual Disks5 Select Create CacheCade Virtual Disk and press Enter Create CacheCade Virtual DiskDelete CacheCade Virtual Disk Reconfiguring CacheCade Virtual DisksAutomatic Reconfiguration of CacheCade Virtual Disks Manual Resizing of CacheCade Virtual Disks Security Key Implementation Security Key Management in the BIOS Configuration UtilitySecurity Key and RAID Management Create Security Key Local Key Management LKMChange Security Key Delete Security Key Securing Pre-Existing Virtual Disks Creating Secured Virtual DisksPage Instant Secure Erase Failure to Delete Security Key Troubleshooting Security Key ErrorsSecured Foreign Import Errors Failure to Select or Configure Non Self-Encrypting Disks non-SEDFailure to Instant Secure Erase Task on Physical Disks Security Key and RAID Management Extra Enclosure Error Message TroubleshootingBIOS Error Messages Discovery Error MessageError Message The following virtual disks have missing Cache Data Lost Error MessageMissing Disks in Virtual Disk Error Message Missing Virtual Disks Error Message Previous Configuration of Disks Removed Error MessageCorrective Action Enable the ROM option Dirty Cache Data Error MessageBIOS Disabled Error Message Offline or Missing Virtual Drives With Preserved Cache Error Message Drive Configuration Changes Error MessageAdapter at Baseport not Responding Error Message Memory or Battery Problem Error Message Virtual Disks Offline Error MessageVirtual Disks Degraded Error Message Virtual Disks Partially Degraded Error MessageError Message Firmware is in Fault State Firmware Fault State Error MessageForeign Configuration Found Error Message Invalid SAS Topology Detected Error Message Foreign Configuration Not Found in CtrlR Error MessagePrevious Configuration Cleared or Missing Error Message Configured Disks Removed or Not Accessible Error Message Multibit ECC Errors Detected Error MessagesCorrective Action Memory ErrorsBattery Discharged or Disconnected Error Message Degraded State of Virtual DisksPERC Card Not Seen in Device Manager General IssuesPreserved Cache State PERC Card Has Yellow Bang in Device ManagerPhysical Disk in Failed State Physical Disk IssuesUnable to Rebuild a Fault Tolerant Virtual Disk Physical Disk Displayed as Blocked Fatal Error or Data Corruption ReportedMultiple Disks Become Inaccessible Rebuilding a Failed Physical Disk Virtual Disk Fails During Rebuild Using a Global Hot SpareVirtual Disk Fails During Rebuild Using a Dedicated Hot Spare Issue A physical disk is taking longer than expected to rebuild Virtual Disk Fails Rebuild Using a Dedicated Hot SparePhysical Disk Fails During Reconstruction on Redundant Virtual Disk Physical Disk Takes a Long Time to RebuildCorrective Action SMART ErrorsSmart Error Detected on a Physical Disk in a Redundant Virtual Disk Target Disk Fails Replace Member ErrorsSmart Error Detected on a Physical Disk in a Non-Redundant Virtual Source Disk Fails During Replace Member OperationDriver Does not Auto-Build into New Kernel Linux Operating System ErrorsVirtual Disk Policy is Assumed as Write-Through Error Message Error Message Unable to Register SCSI Device Error MessageFigure 8-1. Disk Carrier LED Indicators Disk Carrier LED IndicatorsSummary of RAID Levels Appendix RAID DescriptionDisk Striping RAID TerminologyParity Data Disk MirroringSpanned RAID Levels Parity Figure A-3. Example of Distributed Parity RAIDFigure A-4. Example of Dual Distributed Parity RAID Index Page write policy Index