Dell H710P, H310, H810 manual Parameter Description, Summary Of RAID Levels

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For more information, see the topic Managing Dedicated Hot Spares.

3.Initialize the virtual disks.

NOTE: When you use one physical disk group to create multiple virtual disks, all the virtual disks must be configured with the same RAID level.

When you define the virtual disks, you can set the following virtual disk parameters:

–RAID level

–Stripe element size

–Read policy

–Write policy

–Type of initialization

–Hot spare configuration

NOTE: The default hard drive cache policy for a virtual disk composed with SAS hard drives is disabled and with SATA hard drives is enabled. The Virtual Disk parameter cannot be changed in the BIOS Configuration Utility (<Ctrl> <R>). Use Dell OpenManage Storage Management for the hard drive cache setting operation.

The following table shows the parameters that you can configure when defining virtual disks.

Parameter

Description

 

 

RAID Level

RAID Level specifies whether the virtual disk is RAID 0, 1, 5, 6, 10, 50, or 60. The number of

 

disks, disk capacity, the requirements for fault tolerance, performance, and capacity

 

should be considered when selecting the RAID level. For more information, see the topic

 

Summary Of RAID Levels.

Stripe Element Size

Write Policy

Read Policy

Stripe Element Size specifies the size of the segments written to each physical disk in a RAID 0, 1, 5, 6, 10, 50, and 60 virtual disk. You can set the stripe element size to 64 KB 128 KB, 256 KB, 512 KB, or 1024 KB. The default and recommended stripe element size is 64 KB.

A larger stripe element size provides better read performance if your system mostly does sequential reads.

Write Policy specifies the controller write policy. You can set the write policy to Write- Back or Write-Through.

In Write-Back caching, the controller sends a data transfer completion signal to the host when the controller cache has received all the data in a transaction.

NOTE: If a Battery Backup Unit (BBU) is present, the default cache setting is Write- Back. If no BBU is present, the default cache policy default setting is Write-Through.

NOTE: If Write-Backis enabled and the system is quickly turned off and then on, the controller may pause as the system flushes cache memory. Controllers that contain a battery backup default to Write-Backcaching.

In Write-Throughcaching, the controller sends a data transfer completion signal to the host when the disk subsystem has received all the data in a transaction.

Read-Aheadenables the read ahead feature for the virtual disk. You can set the parameter to Read-Ahead, No-Read-Ahead, or Adaptive. The default is Adaptive-Read- Ahead.

Read-Aheadspecifies that the controller uses Read-Aheadfor the current virtual disk. Read-Aheadcapability allows the controller to read sequentially ahead of requested data and store the additional data in cache memory, anticipating that the data is required soon.

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Contents
H710P, and H810 User’s Guide Dell Inc. All Rights Reserved Contents Driver Installation Deploying The Perc CardSupport For Internal Multiple Controllers 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 OverviewSpecification H310 H710 H710P H810 Supported Operating SystemsGetting Help Spans per Disk GroupRelated Documentation Contacting DellDocumentation Feedback Page Features Physical Disk Power ManagementConfigured Spin Down Delay There are four power saving modes availableTypes Of Virtual Disk Initialization Consistency ChecksBackground Initialization Of Virtual Disks Full Initialization Of Virtual DisksUsing Disk Roaming Configuring FastPath-Capable Virtual DisksDisk Roaming FastPathVirtual Disk Migration Migrating Virtual DisksRead WriteWrite-Back And Write-Through Virtual Disk Write Cache PoliciesConditions Under Which Write-Back Is Employed Reconfiguration Of Virtual Disks Virtual Disk Read Cache PoliciesSource RAID Number Capacity Description LevelDisk into a Mirrored virtualDisk by adding One diskFault Tolerance Smart FeatureAutomatic Replace Member With Predicted Failure Reclaims diskPatrol Read Redundant Path Support For Perc H810 OnlyUsing Persistent Hot Spare Slots Using Replace Member And Revertible Hot SparesPhysical Disk Failure Detection 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 Reboot the system when prompted Select Install from a list or specific locationUpdating The Linux Driver Click on the Hardware tabUpgrading The Kernel Version installed Page Bios Configuration Utility Entering The Bios Configuration UtilityManagement Applications For Perc Cards Dell OpenManage Storage ManagementExiting The Configuration Utility To exit the Bios Configuration Utility Ctrl RMenu Navigation Controls Notation Meaning and Use ExampleSetting Up Virtual Disks Notation Meaning and UseCtrl Mgmt, and Foreign View Mgmt, Ctrl Mgmt, and Foreign ViewParameter Description Summary Of RAID LevelsVirtual Disk Management Creating Virtual DisksParameterDescription Select Create New VD and press EnterSelecting Virtual Disk Parameters Converting Physical Disk To RAID Capable For Perc H310Converting Physical Disk To Non-RAID For Perc H310 Initializing Virtual DisksChecking Data Consistency 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 Clearing The Configuration Select Clear ConfigDeleting Virtual Disks 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 Boot Support Enabling Boot Support For a BIOS-Enabled ControllerEnabling Bios Stop On Error Controller ManagementUefi RAID Configuration Utility Restoring Factory Default SettingsEntering The Uefi RAID Configuration Utility Disabling Auto ImportExiting The Uefi RAID Configuration Utility Configuration OptionsDevice Settings menu 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 Reconfiguring CacheCade Virtual Disks Automatic Reconfiguration Of CacheCade Virtual DisksDeleting CacheCade Virtual Disks Manual Resizing Of CacheCade Virtual DisksPage Security Key Management In The Bios Configuration Utility Security Key And RAID ManagementSecurity Key Implementation 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 DisksTroubleshooting Bios Error MessagesDiscovery Error Message 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 Adapter At Baseport Not Responding Error Message Virtual Disks Offline Error MessageVirtual Disks Degraded Error Message Action Cable problems, press any key or Y to continueVirtual Disks Partially Degraded Error Message Memory Or Battery Problem Error MessageFirmware Fault State Error Message Foreign Configuration Found Error MessageForeign Configuration Not Found In Ctrl R Error Message Previous Configuration Cleared Or Missing Error MessageInvalid SAS Topology Detected 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 Memory Errors General IssuesPreserved Cache State Perc Card Has Yellow Bang In Device ManagerPhysical Disk Issues Unable to Rebuild a Fault Tolerant Virtual DiskFatal Error Or Data Corruption Reported Physical Disk In Failed StateMultiple Disks Become Inaccessible Virtual Disk Fails During Rebuild Using a Global Hot SpareRebuilding a Failed Physical Disk Virtual diskVirtual Disk Fails Rebuild Using a Dedicated Hot Spare Smart ErrorsPhysical Disk Takes a Long Time To Rebuild Replace Member Errors Linux Operating System ErrorsIssue General disk fails Corrective ErrorUnable To Register Scsi Device Error Message Install a DKMS-enabled driver packageReboot to the new kernel Driver Does Not Auto-Build Into New KernelDisk Carrier LED Indicators Activity LED Status LEDAppendix RAID Description Summary Of RAID LevelsRAID Terminology Disk StripingSpanned RAID Levels Disk MirroringParity Data Example of Distributed Parity RAID
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