HP 8000 tower manual Limitations, Basic RAID Types, Hardware, RAID 0 with two hard drives Striped

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Hardware

Hardware

The HP Elite 8000-series Business PCs uses Intel chipsets that support an AHCI capable Host Bus Adapter (HBA). This HBA supports ATA and ATAPI devices in both PIO and DMA modes with NCQ as long as the device supports NCQ.

All hard drives shipped with the HP Elite 8000-series Business PCs are NCQ capable.

Limitations

NCQ functionality requires both HBA and hard drive to support it. Non-NCQ capable hard drives will not see any performance benefits even though the HBA is NCQ capable.

Hot-plugging is not possible in an operating system without an AHCI driver that supports hot-plugging, such as DOS, Windows 9x, Windows NT4.0, and older versions of Linux.

Changing AHCI to IDE Mode through the HP Replicated Setup Utility

Multiple AHCI systems can be reverted back to IDE mode using the HP Replicated Setup Utility. This utility allows for system BIOS settings to be replicated and distributed throughout an enterprise. The procedures and information about how to obtain the Replicated Setup Utility are described in the HP white paper “UEFI BIOS Tools for HP Business Desktops” available at http://h10032.www1.hp.com/ctg/Manual/c02932801.pdf .

Basic RAID Types

This section provides a brief explanation of the supported RAID configurations for HP Elite 8000-series Business PCs.

RAID 0 with two hard drives (Striped)

Even though HP supports RAID 0, it is not the recommended configuration for business PC users. Lack of redundancy causes less than half the reliability of a single hard drive system since the Mean Time Between Failure (MTBF) of RAID 0 is equal to the MTBF of an individual drive, divided by the number of drives.

Table 3: RAID 0 with two hard drives (Striped)

First disk

Second disk

 

 

Data Segment 1

Data Segment 2

 

 

Data Segment 3

Data Segment 4

 

 

Data Segment 5

Data Segment 6

 

 

Data Segment 7

Data Segment 8

 

 

Data Segment 9

Data Segment 10

 

 

Data Segment 11

Data Segment 12

 

 

Data Segment 13

Data Segment 14

 

 

Data Segment 15

Data Segment 16

 

 

In the previous table, each “Data Segment n” represents a group of data, known as a strip. In this case, each row represents a stripe. RAID 0 represented in the table above shows how information is segmented, made into chunks or strips, and stored across the stripes of the hard drive members of this RAID volume.

To better illustrate the concept of RAID 0 and striping, Figure 1 shows how a sequence of data “ABCD...” is stored in a RAID 0 mode. In this example, each letter represents a segment or strip. The graphic shows how the various pieces of the information go to different hard drives. If any segment of RAID 0 fails, all information from all members is lost.

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Contents AHCI and RAID on HP Compaq Elite 8000, 8100, 8200, and 8300 Business PCsIntel Rapid Storage Technology Introduction HP business PCIntel chipset Chipset componentsBasics of AHCI and RAID Technology DefinitionsAcronym or term DescriptionBIOS / Software / Hardware Considerations Benefits of AHCIBIOS Interface New operating system installationsettings pass=offlineServicing PathAndCredentials DriverPaths component settings unattend?xml version=1.0 ? publicKeyToken=31bf3856ad364e35 language=neutral versionScope=nonSxSHKLM\System\CCS\Services\iaStor\Parameters\PortX nameGTF value 0=disabled 1=enabledEnhancing existing Windows XP images from IDE Mode GTF Support HP 8100 and 8200 Business PCs onlyLimitations Basic RAID TypesChanging AHCI to IDE Mode through the HP Replicated Setup Utility HardwareFigure 2 Performance - RAID 0 with three hard drives Figure 1 Performance - RAID 0 with two hard drivesRAID 0 with three hard drives is shown in Figure RAID 1 with two hard drives Mirror RAID 5 with three hard drives Intel Matrix RAID Technology Configurations Recommended configurationsOther supported configurations Unsupported configurationsConfiguring RAID on non-factory preinstalled configurations Enabling RAID through F10 System BIOSAccessing RAID Option ROM Configuring RAID Volume using the Option ROM4. Type Y to continue Notes for operating system installation Intel Rapid Storage Technology software installation Using the Intel Rapid Storage Console interface to Configure RAID RAID migrations using Intel Rapid Storage Console Migration to RAID 1 from two non-RAID hard drivesMigration to RAID 0 from two non-RAID hard drives Migration to RAID 0 from three non-RAID hard drivesMigration to RAID 5 from three non-RAID hard drives Migration to Matrix RAID 5 and RAID 0 from three non-RAID hard drives12. Reboot the system after the migration finishes. NOTE Back up all data before proceeding Email notifications HP Elite 8200 and 8300 Business PCs only Configuring Intel Rapid Storage Console forMigration to Matrix RAID 1 and RAID 0 from two non-RAID hard drives Installation Language Table 8 Language supportAbbreviation Degradation Get connected hp.com/go/getconnected
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