Fault Tolerance, Smart Feature, Reclaims disk

Dell H710P, H310 Fault Tolerance, Smart Feature, Automatic Replace Member With Predicted Failure

Page 20

Source RAID	Target RAID Level	Number of	Number of	Capacity	Description
Level		Physical Disks	Physical Disks	Expansion
		(Beginning)	(End)	Possible

					disk space used
					for distributed
					parity data.
RAID 6	RAID 5	4 or more	4 or more	Yes	Removes one set
					of parity data and
					reclaims disk
					space used for it.
RAID 6	RAID 6	4 or more	5 or more	Yes	Increases
					capacity by
					adding disks.

NOTE: The total number of physical disks in a disk group cannot exceed 32. You cannot perform RAID level migration and expansion on RAID levels 10, 50, and 60.

Fault Tolerance

The list of features of the PERC cards that provide fault tolerance to prevent data loss is as follows:

•Support for Self Monitoring and Reporting Technology (SMART)

•Support for Patrol Read

•Redundant path support (for PERC H810 only)

•Physical disk failure detection

•Physical disk rebuild using hot spares

•Controller Cache Preservation

•Battery and Non-Volatile Cache backup of controller cache to protect data

•Detection of batteries with low charge after boot up

The next sections describe some methods to achieve fault tolerance.

The SMART Feature

The SMART feature monitors certain physical aspects of all motors, heads, and physical disk electronics to help detect predictable physical disk failures. SMART-compliant physical disks have attributes for which data can be monitored to identify changes in values and determine whether the values are within threshold limits. Many mechanical and electrical failures display some degradation in performance before failure.

A SMART failure is also referred to as a predicted failure. There are numerous factors that relate to predicted physical disk failures, such as a bearing failure, a broken read/write head, and changes in spin-up rate. In addition, there are factors related to read/write surface failure, such as seek error rate and excessive bad sectors.

NOTE: For detailed information on SCSI interface specifications, see t10.org and for detailed information on SATA interface specifications, see t13.org.

Automatic Replace Member With Predicted Failure

A Replace Member operation can occur when there is a SMART predictive failure reporting on a physical disk in a virtual disk. The automatic Replace Member is initiated when the first SMART error occurs on a physical disk that is part

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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 Security Key And RAID Management Security Key Management In The Bios Configuration UtilityTroubleshooting Appendix RAID Description Multiple Disks Become InaccessibleSource Disk Fails During Replace Member Operation Disk Mirroring Specification H310 H710 H710P OverviewSpecification H310 H710 H710P H810 Supported Operating SystemsGetting Help Spans per Disk GroupDocumentation Feedback Contacting DellRelated Documentation 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 FastPath Virtual Disk Migration Migrating Virtual Disks Read WriteConditions Under Which Write-Back Is Employed Virtual Disk Write Cache PoliciesWrite-Back And Write-Through 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 Click Continue Driver InstallationInstalling a driver 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 Choose Break Mirror and press Enter Break MirrorManaging Preserved Cache Select Manage Ded. HS and press Enter Managing Dedicated Hot SparesSelect Manage Preserved Cache Clearing The Configuration Select Clear ConfigDeleting Virtual Disks Deleting Disk GroupsVirtual Disks Physical Disks Bios Configuration Utility Menu OptionsVirtual Disk Management VD Mgmt Security property of the Disk Group Virtual Disks Virtual Disk Actions Action DescriptionPhysical Disk Management PD Mgmt Physical Disk ActionsController Management Actions RebuildController Management Ctrl Mgmt Physical Disk Management Foreign Configuration ViewSetting LED Blinking Replacing An Online Physical Disk Creating Global Hot SparesRemoving Global Or Dedicated Hot Spares Performing a Manual Rebuild Of An Individual Physical Disk Restrictions and LimitationsStopping Background Initialization 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 MenuEnclosure Management Virtual Disk ManagementPhysical Disk Management Menu CacheCade CacheCade Virtual Disk CharacteristicsConfiguring And Managing CacheCade Virtual Disks Select Create CacheCade Virtual Disk and press Enter CacheCade Virtual Disk ManagementCreating CacheCade Virtual Disks 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 KeySecuring Pre-Existing Virtual Disks Deleting a Security KeyCreating Secured Virtual Disks Highlight the Secure Disk Group option and press Enter Instant Secure Erase Troubleshooting Security Key ErrorsSecured Foreign Import Errors Failure To Delete Security Key Failure To Instant Secure Erase Task On Physical DisksTroubleshooting Bios Error MessagesDiscovery Error Message Extra Enclosure Error MessageMissing Virtual Disks Error Message Missing Disks In Virtual Disk Error MessagePrevious Configuration Of Disks Removed Error Message Drive Configuration Changes Error Message Dirty Cache Data Error MessageBios Disabled 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 MessagesDegraded State Of Virtual Disks Configured Disks Removed Or Not Accessible Error MessageBattery Discharged Or Disconnected Error Message 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 diskPhysical Disk Takes a Long Time To Rebuild Smart ErrorsVirtual Disk Fails Rebuild Using a Dedicated Hot Spare 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 StripingParity Data Disk MirroringSpanned RAID Levels Example of Distributed Parity RAID

Related manuals

Dell H710P, H310 Fault Tolerance, Smart Feature, Automatic Replace Member With Predicted Failure

Source RAID

disk space used

for distributed

parity data.

4 or more

of parity data and

reclaims disk

Fault Tolerance

The SMART Feature

Automatic Replace Member With Predicted Failure