Dell H710P, H310, H810 manual Managing Preserved Cache, Choose Break Mirror and press Enter

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Break Mirror

A Break Mirror operation is an operation that can be performed only on RAID1 arrays. It provides a way to 'split' the mirror and spin-down one of the hard disks, which can then be imported into the configuration of a different PERC H310, H710, H710P, or H810 controller. This can be a useful way to:

•Create a disk image that can be imported and booted on a different system.

•Assist in software or configuration testing, where half of the mirror can be removed to ensure configuration consistency.

NOTE: The Break Mirror operation is not available within the booted operating system environment. It is only available in the BIOS (<Ctrl> <R>) utility and the UEFI RAID configuration utility.

Break Mirror In BIOS Configuration Utility

The RAID1 VD that you are to split must be in an optimal state, and it cannot be running any other background tasks. To use the Break Mirror feature from the BIOS Configuration Utility (<Ctrl> <R>), perform the following steps:

1.During boot up, press <Ctrl> <R> when prompted by the BIOS screen. If there is more than one controller in the system, choose the controller.

The VD Mgmt screen is displayed by default.

2.Highlight the appropriate Disk Group.

3.Press <F2> to display the available actions.

4.Choose Break Mirror and press <Enter>.

A dialog is displayed describing the operation and asking if you are sure you want to perform the operation.

5.Select Yes to continue.

The exported disk (exporting configuration) spins down and the hard drive status LED starts flashing to identify which drive must be pulled.

The remaining disk (exporting configuration) is in a degraded state until the missing member is replaced or rebuilt.

If there are any Global or Dedicated Hot Spare assigned which fulfills the rebuild requirements for the degraded RAID1 disk, a rebuild starts automatically. If there is no Hot Spare assigned, then a Hot Spare that meets all the requirements for the VD must be assigned before the rebuild starts.

NOTE: Importing a Broken Mirror is the same as importing a Foreign configuration. See the topic Importing Or Clearing Foreign Configurations Using The VD Mgmt Menu. The imported VD is in a degraded state until the missing member is rebuilt.

Managing Preserved Cache

If a virtual disk becomes offline or is deleted because of missing physical disks, the controller preserves the dirty cache from the virtual disk. The preserved dirty cache, known as pinned cache, is preserved until you import the virtual disk or discard the cache.

NOTE: Certain operations, such as creating a new virtual disk, cannot be performed if preserved cache exists. You have to enter the BIOS Configuration Utility (<Ctrl> <R>) to resolve the situation before you boot to the operating system. Messages are displayed notifying you that you must enter the BIOS Configuration Utility (<Ctrl> <R>) to discard the preserved cache or import the virtual disks with the preserved cache.

CAUTION: If there are any foreign configurations, it is strongly advised that you import the foreign configuration before you discard the preserved cache. Otherwise, you might lose data that belongs with the foreign configuration.

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Contents H710P, and H810 User’s Guide Dell Inc. All Rights Reserved Contents Support For Internal Multiple Controllers Driver InstallationDeploying The Perc Card Management Applications For Perc CardsCacheCade Troubleshooting Security Key Management In The Bios Configuration UtilitySecurity Key And RAID Management Source Disk Fails During Replace Member Operation Multiple Disks Become InaccessibleAppendix RAID Description Disk Mirroring Specification H310 H710 H710P OverviewGetting Help Specification H310 H710 H710P H810Supported Operating Systems Spans per Disk GroupRelated Documentation Contacting DellDocumentation Feedback Page Configured Spin Down Delay FeaturesPhysical Disk Power Management There are four power saving modes availableBackground Initialization Of Virtual Disks Types Of Virtual Disk InitializationConsistency Checks Full Initialization Of Virtual DisksDisk Roaming Using Disk RoamingConfiguring FastPath-Capable Virtual Disks FastPathRead Virtual Disk MigrationMigrating Virtual Disks WriteWrite-Back And Write-Through Virtual Disk Write Cache PoliciesConditions Under Which Write-Back Is Employed Source RAID Reconfiguration Of Virtual DisksVirtual Disk Read Cache Policies Number Capacity Description LevelDisk by adding Disk into aMirrored virtual One diskAutomatic Replace Member With Predicted Failure Fault ToleranceSmart Feature Reclaims diskPatrol Read Redundant Path Support For Perc H810 OnlyPhysical Disk Failure Detection Using Persistent Hot Spare SlotsUsing Replace Member And Revertible Hot Spares Physical Disk Hot SwappingBattery Transparent Learn Cycle Controller Cache PreservationPage Deploying The Perc Card Removing The Perc ControllerPCIe slot SAS cable connectors Perc adapter Screw Removing and Installing the Perc AdapterInstalling The Perc Controller Removing and Installing the Perc Mini Monolithic ControllerSetting Up Redundant Path Support On The Perc H810 Adapter Support For Internal Multiple ControllersRedundant Path Support Configuration With Two Enclosures Server StoragePage Installing a driver Driver InstallationClick Continue Popular support tools section, click Drivers and Downloads Updating The Linux Driver Reboot the system when promptedSelect Install from a list or specific location Click on the Hardware tabUpgrading The Kernel Version installed Page Management Applications For Perc Cards Bios Configuration UtilityEntering The Bios Configuration Utility Dell OpenManage Storage ManagementMenu Navigation Controls Exiting The Configuration UtilityTo exit the Bios Configuration Utility Ctrl R Notation Meaning and Use ExampleCtrl Mgmt, and Foreign View Setting Up Virtual DisksNotation Meaning and Use Mgmt, Ctrl Mgmt, and Foreign ViewParameter Description Summary Of RAID LevelsParameterDescription Virtual Disk ManagementCreating Virtual Disks Select Create New VD and press EnterSelecting Virtual Disk Parameters Converting Physical Disk To RAID Capable For Perc H310Checking Data Consistency Converting Physical Disk To Non-RAID For Perc H310Initializing Virtual Disks Running a Data Consistency CheckPage Page Managing Preserved Cache Break MirrorChoose Break Mirror and press Enter Select Manage Preserved Cache Managing Dedicated Hot SparesSelect Manage Ded. HS and press Enter Deleting Virtual Disks Clearing The ConfigurationSelect Clear Config Deleting Disk GroupsVirtual Disk Management VD Mgmt Bios Configuration Utility Menu OptionsVirtual Disks Physical Disks Security property of the Disk Group Virtual Disks Virtual Disk Actions Action DescriptionPhysical Disk Management PD Mgmt Physical Disk ActionsController Management Ctrl Mgmt RebuildController Management Actions Setting LED Blinking Foreign Configuration ViewPhysical Disk Management Removing Global Or Dedicated Hot Spares Creating Global Hot SparesReplacing An Online Physical Disk Stopping Background Initialization Restrictions and LimitationsPerforming a Manual Rebuild Of An Individual Physical Disk Enabling Bios Stop On Error Enabling Boot SupportEnabling Boot Support For a BIOS-Enabled Controller Controller ManagementEntering The Uefi RAID Configuration Utility Uefi RAID Configuration UtilityRestoring Factory Default Settings Disabling Auto ImportDevice Settings menu Exiting The Uefi RAID Configuration UtilityConfiguration Options Controller Management MenuPhysical Disk Management Menu Virtual Disk ManagementEnclosure Management Configuring And Managing CacheCade Virtual Disks CacheCade Virtual Disk CharacteristicsCacheCade Creating CacheCade Virtual Disks CacheCade Virtual Disk ManagementSelect Create CacheCade Virtual Disk and press Enter Deleting CacheCade Virtual Disks Reconfiguring CacheCade Virtual DisksAutomatic Reconfiguration Of CacheCade Virtual Disks Manual Resizing Of CacheCade Virtual DisksPage Security Key Implementation Security Key Management In The Bios Configuration UtilitySecurity Key And RAID Management Local Key Management LKMCreating a Security Key Changing The Security KeyCreating Secured Virtual Disks Deleting a Security KeySecuring Pre-Existing Virtual Disks Highlight the Secure Disk Group option and press Enter Secured Foreign Import Errors Troubleshooting Security Key ErrorsInstant Secure Erase Failure To Delete Security Key Failure To Instant Secure Erase Task On Physical DisksDiscovery Error Message TroubleshootingBios Error Messages Extra Enclosure Error MessagePrevious Configuration Of Disks Removed Error Message Missing Disks In Virtual Disk Error MessageMissing Virtual Disks Error Message Bios Disabled Error Message Dirty Cache Data Error MessageDrive Configuration Changes Error Message Virtual Disks Degraded Error Message Adapter At Baseport Not Responding Error MessageVirtual Disks Offline Error Message Action Cable problems, press any key or Y to continueFirmware Fault State Error Message Virtual Disks Partially Degraded Error MessageMemory Or Battery Problem Error Message Foreign Configuration Found Error MessageInvalid SAS Topology Detected Error Message Foreign Configuration Not Found In Ctrl R Error MessagePrevious Configuration Cleared Or Missing Error Message Multibit ECC Errors Detected Error MessagesBattery Discharged Or Disconnected Error Message Configured Disks Removed Or Not Accessible Error MessageDegraded State Of Virtual Disks Preserved Cache State Memory ErrorsGeneral Issues Perc Card Has Yellow Bang In Device ManagerFatal Error Or Data Corruption Reported Physical Disk IssuesUnable to Rebuild a Fault Tolerant Virtual Disk Physical Disk In Failed StateRebuilding a Failed Physical Disk Multiple Disks Become InaccessibleVirtual Disk Fails During Rebuild Using a Global Hot Spare Virtual diskVirtual Disk Fails Rebuild Using a Dedicated Hot Spare Smart ErrorsPhysical Disk Takes a Long Time To Rebuild Issue General disk fails Corrective Replace Member ErrorsLinux Operating System Errors ErrorReboot to the new kernel Unable To Register Scsi Device Error MessageInstall a DKMS-enabled driver package Driver Does Not Auto-Build Into New KernelDisk Carrier LED Indicators Activity LED Status LEDRAID Terminology Appendix RAID DescriptionSummary Of RAID Levels Disk StripingSpanned RAID Levels Disk MirroringParity Data Example of Distributed Parity RAID
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H310, H710, H710P, H810 specifications

Dell offers a range of storage controller technologies, notably the H810, H710, H710P, and H310, which cater to different enterprise needs. These controllers are designed to support various storage configurations, enhancing overall system performance and reliability.

The Dell H810 is a high-performance PCIe 3.0 RAID controller that supports up to eight internal drives and is particularly suited for demanding workloads. It features advanced RAID levels including RAID 0, 1, 5, 6, 10, 50, and 60, providing flexibility for various data protection strategies. The H810 also supports up to 32TB of storage capacity, making it suitable for environments that require substantial data management capabilities.

The H710 is another powerful RAID controller, widely recognized for its balance of performance and cost-efficiency. It features 1GB of cache memory, which aids in accelerating read and write operations. The H710 supports the same RAID levels as the H810 and allows for up to 512MB of non-volatile memory. This ensures data integrity even in the event of a power failure, making it reliable for critical applications.

The H710P is an enhanced version of the H710, with a significant upgrade in its cache capabilities. It offers 2GB of battery-backed cache memory, further enhancing data processing speeds and improving responsiveness. The H710P is ideal for intensive workloads and virtualization, where rapid access to data is essential. This controller also includes features such as RAID storage pooling, intelligent data tiering, and support for multiple virtual disks.

Finally, the H310 is a cost-effective option for small to medium-sized businesses or those with less demanding storage requirements. It offers similar RAID support as the higher-end controllers but operates with a simpler architecture. The H310 features 512MB of cache, providing sufficient performance for regular workloads without the additional complexities of more advanced controllers.

In summary, Dell's H810, H710, H710P, and H310 storage controllers each serve distinct purposes, providing various features, technologies, and performance characteristics tailored to different business needs. From high-capacity storage solutions to user-friendly setups, Dell’s offerings ensure that organizations can efficiently manage their data storage requirements.
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