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Dell H710P, H310, H810 manual Figure A-3. Example of Distributed Parity RAID

Models: H310 H710 H710P H810

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Figure A-3. Example of Distributed Parity (RAID 5)

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 level 5 combines distributed parity with disk striping, as shown in Figure A-3. Parity provides redundancy for one physical disk failure without duplicating the contents of entire physical disks.

RAID 6 combines dual distributed parity with disk striping. This level of parity allows for two disk failures without duplicating the contents of entire physical disks.

Figure A-3. Example of Distributed Parity (RAID 5)

Stripe element 1	Stripe element 2	Stripe element 3	Stripe element 4	Stripe element 5	Parity (1–5)
Stripe element 7	Stripe element 8	Stripe element 9	Stripe element 10	Parity (6–10)	Stripe element 6
Stripe element 13	Stripe element 14	Stripe element 15	Parity (11–15)	Stripe element 11	Stripe element 12
Stripe element 19	Stripe element 20	Parity (16–20) Stripe element 16		Stripe element 17	Stripe element 18
Stripe element 25	Parity (21–25)	Stripe element 21	Stripe element 22	Stripe element 23	Stripe element 24
Parity (26–30)	Stripe element 26	Stripe element 27	Stripe element 28	Stripe element 29	Stripe element 30

NOTE: Parity is distributed across multiple physical disks in the disk group.

Figure A-4. Example of Dual Distributed Parity (RAID 6)

Stripe element 1	Stripe element 2	Stripe element 3	Stripe element 4	Parity (1–4)	Parity (1–4)
Stripe element 5	Stripe element 6	Parity (5–8)	Parity (5–8)	Stripe element 7	Stripe element 8
Parity (9–12)	Parity (9–12)	Stripe element 9	Stripe element 10	Stripe element 11	Stripe element 12
Stripe element 13	Stripe element 14	Parity (13–16)	Parity (13–16)	Stripe element 15	Stripe element 16

NOTE: Parity is distributed across all disks in the array.

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Appendix: RAID Description

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Dell H710P, H310, H810 Figure A-3. Example of Distributed Parity RAID, Figure A-4. Example of Dual Distributed Parity RAID

Contents

Dell PowerEdge RAID Controller PERC H310 H710, H710P, and H810 User’s GuideNotes, Cautions, and Warnings Model UCPA-801, UCPB-800, UCPM-800 and UCPE-800Contents Physical Disk Power ManagementSupported Operating Systems Types of Virtual Disk Initialization3 Deploying the PERC Card Write-Back With No Battery is EmployedReconfiguration of Virtual Disks Using Persistent Hot Spare SlotsSetting up Redundant Path Support Installing the Windows DriversSupport For Internal Reverting to Single Path Support5 Management Applications BIOS Configuration UtilityVirtual Disk Management UEFI RAID Configuration Utility CacheCade Virtual Disk CharacteristicsConfiguring and Managing 7 Security Key and Troubleshooting Security Key ErrorsSecurity Key Implementation Security Key Management in theMissing Disks in Virtual Disk Error Message Missing Virtual Disks Error MessageWith Preserved Cache Error Message Virtual Disks Degraded Error MessageUnable to Rebuild a Fault Tolerant Virtual Disk Fatal Error or Data Corruption ReportedDegraded State of Virtual Disks PERC Card Not Seen in Device ManagerA Appendix RAID Description Linux Operating System ErrorsContents Overview Specification H310H710 H710PSupported Operating Systems Related Documentation Contacting Dell1 Go to support.dell.com 3 Select Select a Product in Product Support 4 Select Enter a TagFeatures Physical Disk Power ManagementConfigured Spin Down Delay Types of Virtual Disk InitializationBackground Initialization of Virtual Disks Full Initialization of Virtual Disks Fast Initialization of Virtual DisksConsistency Checks Disk RoamingVirtual Disk Migration Perform the following steps to use disk migration Virtual Disk Write Cache Policies Write-Back and Write-ThroughConditions Under Which Forced Write-Back With No Battery is Employed Virtual Disk Read Cache PoliciesConditions Under Which Write-Back is Employed Reconfiguration of Virtual Disks Table 2-1. RAID Level Migration a mirrored virtual disk by adding one diskFault Tolerance The SMART FeaturePatrol Read Automatic Replace Member with Predicted FailureRedundant Path Support For PERC H810 Only Using Persistent Hot Spare Slots Physical Disk Failure DetectionPhysical Disk Hot Swapping Using Replace Member and Revertible Hot Spares Controller Cache PreservationBattery Transparent Learn Cycle Cache Data RecoveryCache Preservation With Non-Volatile Cache NVC TLC Time FrameWhen to Replace the Battery Features Deploying the PERC Card Installing the PERC Controller Removing the PERC ControllerFigure 3-1. Removing and Installing the PERC Adapter SAS cable connectors2PCIe slot PERC adapterFigure 3-2. Removing and Installing the PERC Mini Blade Controller PERC stack-up connectorSupport For Internal Multiple Controllers PERC mini monolithic controllerSetting up Redundant Path Support on the PERC H810 Adapter Page Figure 3-4. Redundant Path Support Configuration With Two Enclosures storageDriver Installation Installing the Windows DriversCreating the Driver Media Pre-Installation Requirements Creating the Device Driver Media3 Click Continue Downloading Drivers From the Dell Support Website1 Turn off the system 2 Install the new RAID controller in the system 8 Select Install from a list or specific location Updating Existing Windows Server 2008 or Windows Server 2008 R24 Click Device Manager Updating the Linux Driver Installing or Updating the RPM Driver Package With DKMS Support Installing or Updating the RPM Driver Package With KMOD SupportInstalling or Updating the RPM Driver Package With KMP Support Upgrading the KernelDriver Installation Management Applications for PERC Cards Dell OpenManage Storage ManagementBIOS Configuration Utility Entering the BIOS Configuration UtilityExiting the Configuration Utility Menu Navigation ControlsTable 5-1. Menu Navigation Keys Notationto exit the BIOS Configuration Utility Table 5-1. Menu Navigation Keys continuedNotation Meaning and UseSetting Up Virtual Disks Table 5-1. Menu Navigation Keys continuedNotation Meaning and UseTable 5-2. Virtual Disk Parameters and Descriptions ParameterDescription RAID Levelor Adaptive. The default is Adaptive-Read-Ahead Table 5-2. Virtual Disk Parameters and Descriptions continuedParameter DescriptionVirtual Disk Management Creating Virtual Disks10 Select additional disks, if required j Press Tab to move the cursor to Initialize and press Enter Converting Physical Disk to RAID Capable for PERC H310 Converting Physical Disk to Non-RAID for PERC H310Initializing Virtual Disks 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 Managing Preserved Cache 3 Select Manage Preserved CacheManaging Dedicated Hot Spares Creating a dedicated hot spareDeleting a dedicated hot spare Deleting Virtual Disks Deleting Disk GroupsBIOS Configuration Utility Menu Options Clearing the Configuration4 Select Clear Config Virtual Disk Management VD Mgmt menuVirtual Disk Management VD Mgmt Virtual Disks Physical DisksInformation Displayed in Right Panel in Left PanelVirtual Disks Disk Group # PropertiesMenu Item Selected Information Displayed in Right Panel in Left Panel Management Applications for PERC CardsInformation Displayed in Right Panel in Left PanelManagement Applications for PERC Cards Virtual Disk Actions Table 5-4. Virtual Disk ActionsAction DescriptionPhysical Disk Management PD Mgmt Physical Disk Actions RebuildController Management Ctrl Mgmt Controller Management Actions Configuration Utility CtrlRTable 5-8. Controller Management Options OptionForeign Configuration View Setting LED BlinkingPhysical Disk Management Creating Global Hot Spares Removing Global or Dedicated Hot SparesReplacing an Online Physical Disk Stopping Background Initialization Restrictions and LimitationsEnabling Boot Support Controller ManagementPerforming a Manual Rebuild of an Individual Physical Disk Enabling BIOS Stop on Error Enabling Auto Import UEFI RAID Configuration Utility Restoring Factory Default SettingsEntering the UEFI RAID Configuration Utility Exiting the UEFI RAID Configuration Utility Configuration OptionsController Management Virtual Disk Management Physical Disk ManagementEnclosure Management CacheCade Virtual Disk Characteristics CacheCadeConfiguring and Managing CacheCade Virtual Disks CacheCade Virtual Disk ManagementCreate CacheCade Virtual Disk 5 Select Create CacheCade Virtual Disk and press EnterReconfiguring CacheCade Virtual Disks Delete CacheCade Virtual DiskAutomatic Reconfiguration of CacheCade Virtual Disks Manual Resizing of CacheCade Virtual Disks Security Key Management in the BIOS Configuration Utility Security Key and RAID ManagementSecurity Key Implementation Local Key Management LKM Create Security KeyChange Security Key Delete Security Key Creating Secured Virtual Disks Securing Pre-Existing Virtual DisksPage Instant Secure Erase Troubleshooting Security Key Errors Secured Foreign Import ErrorsFailure to Select or Configure Non Self-Encrypting Disks non-SED Failure to Delete Security KeyFailure to Instant Secure Erase Task on Physical Disks Security Key and RAID Management Troubleshooting BIOS Error MessagesDiscovery Error Message Extra Enclosure Error MessageCache Data Lost Error Message Missing Disks in Virtual Disk Error MessageError Message The following virtual disks have missing Previous Configuration of Disks Removed Error Message Missing Virtual Disks Error MessageDirty Cache Data Error Message BIOS Disabled Error MessageCorrective Action Enable the ROM option Drive Configuration Changes Error Message Adapter at Baseport not Responding Error MessageOffline or Missing Virtual Drives With Preserved Cache Error Message Virtual Disks Offline Error Message Virtual Disks Degraded Error MessageVirtual Disks Partially Degraded Error Message Memory or Battery Problem Error MessageFirmware Fault State Error Message Foreign Configuration Found Error MessageError Message Firmware is in Fault State Foreign Configuration Not Found in CtrlR Error Message Previous Configuration Cleared or Missing Error MessageInvalid SAS Topology Detected Error Message Multibit ECC Errors Detected Error Messages Configured Disks Removed or Not Accessible Error MessageMemory Errors Battery Discharged or Disconnected Error MessageDegraded State of Virtual Disks Corrective ActionGeneral Issues Preserved Cache StatePERC Card Has Yellow Bang in Device Manager PERC Card Not Seen in Device ManagerPhysical Disk Issues Unable to Rebuild a Fault Tolerant Virtual DiskPhysical Disk in Failed State Fatal Error or Data Corruption Reported Multiple Disks Become InaccessiblePhysical Disk Displayed as Blocked Virtual Disk Fails During Rebuild Using a Global Hot Spare Virtual Disk Fails During Rebuild Using a Dedicated Hot SpareRebuilding a Failed Physical Disk Virtual Disk Fails Rebuild Using a Dedicated Hot Spare Physical Disk Fails During Reconstruction on Redundant Virtual DiskPhysical Disk Takes a Long Time to Rebuild Issue A physical disk is taking longer than expected to rebuildSMART Errors Smart Error Detected on a Physical Disk in a Redundant Virtual DiskCorrective Action Replace Member Errors Smart Error Detected on a Physical Disk in a Non-Redundant VirtualSource Disk Fails During Replace Member Operation Target Disk FailsLinux Operating System Errors Virtual Disk Policy is Assumed as Write-Through Error MessageDriver Does not Auto-Build into New Kernel Unable to Register SCSI Device Error Message Error MessageDisk Carrier LED Indicators Figure 8-1. Disk Carrier LED IndicatorsAppendix RAID Description Summary of RAID LevelsRAID Terminology Disk StripingDisk Mirroring Spanned RAID LevelsParity Data Figure A-3. Example of Distributed Parity RAID Figure A-4. Example of Dual Distributed Parity RAIDParity Index Page write policy Index