Advanced Host Controller Interface (AHCI) and Redundant Array of Independent Disks (RAID) on HP EliteDesk and EliteOne 705 Business PCs Using AMD Array Management Software (RAIDXpert2)

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PnP Plug and Play, automated hardware discovery and configuration.
POST Power-On Self Test, a BIOS-initiated routine that executes when a system is powered on. System
hardware is configured, component integrity is checked, and the system is booted.
RAID Redundant Array of Independent Disks, storage technology that combines multiple hard drives into a
single logical unit. Described in more detail in this document.
ROM Read Only Memory, non-volatile memory that is resistant to modification.
SATA Serial ATA, a serialized interface (replacing ATA) to connect storage devices to the system.
Stripe Set of data on a single hard drive in a RAID 0 volume.
Striping
Group of all stripes going horizontally across all the hard drive members of a RAID 0 volume. Striping
improves performance by interleaving bytes or groups of bytes across multiple drives so more than one
disk is reading and writing simultaneously.
UEFI
Unified Extensible Firmware Interface is a specification that defines a software interface between an
operating system and platform firmware. UEFI is meant to replace the Basic Input/Output System (BIOS)
firmware interface.
UFD
USB Flash Drive, a storage device using flash memory and USB interface. It is used to install storage
drivers during OS installation.
Table 2: RAID Modes
Mode Purpose Minimal HDD Required
RAID 0 Striped for Performance 2
RAID 1 Mirrored for Protection 2
RAID 0 + 1 Mirrored and Striped 4 (see note)
RAID 5 Striped with parity 3 (see note)
NOTE: Not supported on HP EliteDesk and EliteOne Business PCs
Important RAID Configuration information
• RAID 1 is the only RAID configuration that HP EliteDesk and EliteOne 705 Business PC products offer as factory
configuration.
• The preconfigured systems:
– Are complete RAID systems
– Have both drives installed
– Have the necessary Option ROM configuration
– Are preloaded and preinstalled with all required software
– Include a preinstalled operating system that is in mirrored mode out of the box
Basic RAID Types
This section provides a brief explanation of the supported RAID configurations for HP EliteDesk and EliteOne 705
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.