RAID 1 ADM and RAID 10 ADM | HP Smart Storage Adstrator specification

Disadvantages:

•This method is expensive, because many drives are needed for fault tolerance.

•Only half of the total drive capacity is usable for data storage.

RAID 1 (ADM) and RAID 10 (ADM)

In RAID 1 (ADM) and RAID 10 (ADM) configurations, data is duplicated to two additional drives.

When the array contains only three physical drives, the fault-tolerance method is known as RAID 1 (ADM).

When the array has more than three physical drives, drives are mirrored in trios, and the fault-tolerance method is known as RAID 10 (ADM).

In each mirrored trio, the physical drives that are not busy answering other requests answer any read requests that are sent to the array. This behavior is called load balancing. If a physical drive fails, the remaining two drives in the mirrored trio can still provide all the necessary data. Several drives in the array can fail without incurring data loss, as long as no three failed drives belong to the same mirrored trio.

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HP Smart Storage Adstrator manual RAID 1 ADM and RAID 10 ADM

Contents

HP Smart Storage Administrator User Guide Page Contents Optional components 130 Benefits of using HP SSA About HP SSA Support for configuration tasks Procedure HP Smart Array Array configuration Array configuration guidelines Native support for 64-bit and 32-bit operating systems Minimum requirements Accessing HP SSA in the offline environment Launching HP SSA during Post Gen8 or later Burning the image to a CD or DVD Launching HP SSA from an ISO image all generationsMounting the image through iLO Prerequisites Installing the image on a PXE serverSet up PXELinux Configure PXELinux Specify the ISO image path Accessing HP SSA in the online environment Supported network file systems Http//servername2301 Launching HP SSA on a local serverHpssa- h Operations Using the HP SSA GUI Icon and key stroke legend Navigating the GUI Configure screen When a controller is selected, the following elements appear Diagnostics screen HP SSA help Configuration tasks Configuring a controller Performing a Configuration task HP SSD Smart Path Operations Rapid Parity Initialization SSD Over Provisioning Optimization Operations Changing the Spare Activation Mode Changing the Spare Management mode Operations Cache Manager Operations Enable HP SmartCache About HP SmartCache Operations Operations Installing a license key with HP SmartCache Enabling SmartCache Write-back Operations Working with mirrored arrays Splitting a mirrored array Creating a split mirror backup Recombining a split mirrored array Healing an array Setting Auto RAID Replacing an array Click Create Arrays with RAID Operations Managing FLS Setting RAID mode or HBA mode Managing modes Operations Power modes Viewing controller status Diagnostic tasks Performing a Diagnostics task Operations \Program Files\hp\hpssacli\Bin\hpssacli.exe Using the HP SSA CLIOpening the CLI in Console mode Root@localhost root# hpssacli CLI syntax Opening the CLI in Command modeCommand variable Target variable Hiding warning prompts Available options are Current value DefaultQuerying a device = ctrl ch=Lab4 ld 1 modify raid=0 ss=? Keyword abbreviations Show commandTarget controller show config detail Target show detailstatus = ctrl all show Displaying the current versions of the application layers Help command= ctrl ch=lab4 show config Version Setting the boot volume Typical proceduresSetting the boot controller Set target target Setting the targetIdentifying devices = set target ctrl slot=3 = clear target Target modify led=onoff Generating a diagnostic reportDeleting target devices Target delete forced Entering or deleting a license key Erasing a physical driveRescanning the system Optimizing controller performance for video Creating a logical drive Target create type=ld parameter=value Available options are +0 default value Sample scenario Target modify drives=# ##,# ##,# ##-# ## Moving a logical driveTarget modify newarray= Viewing SSD information Viewing enclosure informationViewing SSD physical drives SmartCache in Hpssacli Assigning a chassis name to the controller Rapid Parity Initialization methodsSSD Over Provisioning Optimization = ctrl slot=1 array B create type=ldcache datald=2 Target modify spareactivationmode= failure predictive Setting the spare activation modeManaging spare drives Controller slot=1 modify spareactivationmode=predictive Shrinking an array Spare Management Mode in HpssacliExpanding an array Target modify drives=###-### spares=###-### Moving an arrayTarget remove drives=###-### Target modify size=#max? forced Extending a logical drive= ctrl slot=1 create type=arrayr0 drives=allunassigned Migrating a logical drive Setting the preferred path modeTarget modify raid=01+0156adg? ss=8163264128256default? Target modify preferredpathmode=automaticmanual? Assigning a redundant controller to a logical drive Changing the Rebuild Priority settingDisabling a redundant controller Changing the surface scan delay time Changing the Expand Priority settingSetting the surface scan mode Re-enabling a failed logical drive Enabling or disabling the array accelerator Changing the controller cache ratioEnabling or disabling the drive cache Set exitonerror=enable set eoe=disable Show exitonerror Enabling a script to exit on errorUsing the Split Mirror command Enabling SmartCache Write-back Controller slot=5 modify latency=low HBA modeTarget modify latency=lowhighdisable? Target modify hbamode=onoff? RAID mode Using HP SSA scriptingPower mode Creating an HP SSA script file Capturing a configurationUsing an Input script Hpssascripting -c Filename -internal -external -e Filename Script file requirements Sample custom input script Sample custom capture script Date captured Wed Jan 15 153314 Version Initial encryption configuration Sample encryption script Encryption configuration PlainText= Enable Script file options Control category Action modeMethod mode Controller category CacheState ClearConfigurationWithDataLossController IRPEnable DPOEnableElevatorSortEnable DriveWriteCache Power modes MNPDelayNoBatteryWriteCache LicenseKey, DeleteLicenseKey QueueDepth SurfaceScanDelaySurfaceScanDelayExtended RapidParityInitialization Array DPOEnable = No ElevatorSortEnable = Yes IRPEnable = NoArray category ArrayR0 DriveType CachingArrayDrive OnlineSpareMode SplitMirror Logical Drive categoryOnlineSpare CachingLogicalDrive ArrayAcceleratorLogicalDrive PreferredPath CachedLogicalDriveNumberOfParityGroups Renumber SetBootVolumePrimarySetBootVolumeSecondary Repeat SmartCache Write-back SizeSizeBlocks StripSize Encryption support commands Encryption controller category ControllerPasswordMode Remove Suspend Resume Encryption logical volume category EncryptionRecoveryQuestion \hpssascripting -c out.xml XML supportXML output XML input XML input file DTD HP SSA scripting warning messages Comment or clarification Code HP SSA scripting error messages Error code Error message Comment or clarification This error can occur when you attempt to add or Or logical drive Free space for the requested size 3011 Expand array and changed the size or RAID level ACCEPTEULA=YES Reported information HP Smart Storage Administrator Diagnostics Utility CLIAbout the utility Troubleshooting Installing the utility Field Description SmartSSD Wear Gauge report procedures Launching the utility in CLI modeDiagnostic report procedures Drive arrays Drive arrays and fault-tolerance methods512e Physical drive support Identifying and viewing SmartSSD Wear Gauge report files Troubleshooting Troubleshooting Fault-tolerance methods Effects of a hard drive failure on logical drives RAID 0-No fault tolerance RAID 1 and RAID 1+0 RAID Troubleshooting RAID 1 ADM and RAID 10 ADM RAID 5-distributed data guarding RAID 6 ADG-Advanced Data Guarding RAID Comparing the hardware-based RAID methods Alternative fault-tolerance methods Selecting a RAID method Troubleshooting resources Diagnosing array problemsDiagnostic tools Troubleshooting Optional components HP Secure Encryption HP Smart Array Advanced Pack About Saap Acronyms and abbreviations ILO PXE Documentation feedback Index HP Smart Storage Administrator Diagnostics Utility XML DTD