Technical white paper | AHCI and RAID on HP rp7800, rp5810, and rp5800 Retail Systems
10
Configurations
Recommended configurations
HP recommends factory configurations of the preinstalled RAID offerings for HP rp7800, rp5810, and rp5800 Retail
Systems. The preinstalled RAID offering is a RAID 1 volume of two identical SATA hard drives.
HP rp7800, rp5810, and rp5800 Retail Systems are based on Intel chipsets that provide a combined hardware and software
RAID solution. The Intel mass storage controller allows all drives to operate in IDE or RAID SATA modes. Each mode of the
controller means a different PCI controller, with different device ID, class code, and driver support.
CAUTION
The PCI Device ID of the mass storage controller changes after changing SATA emulation mode in the BIOS. Changing the
BIOS from AHCI mode to RAID mode is the equivalent of connecting the hard drives to a new add-on RAID storage controller.
The installed operating system on the hard drive is unaware of this new mass storage controller. If the operating system
does not have the RAID drivers enumerated and PnP for the RAID controller, the operating system will fail to boot (blue
screen under Microsoft Windows) when Windows 7 or Windows 8 attempts to boot.
Table 5. RAID drives.
Mode
Purpose Minimum drives required
RAID 0 Striped for Performance. 2
RAID 1 Mirrored for Protection. 2
RAID 5 Parity for Accuracy. 3*
RAID 0 + 1 Mirrored and Striped. 4**
Intel’s Rapid
Technology
4 logical drives on 2 physical disks, to
emulate RAID 0 and 1
2
*not supported on HP rp7800 Retail Systems
**not supported on HP rp5810 and rp5800 Retail Systems
The following notes are important for RAID configurations:
• RAID 1 is the only RAID configuration that is offered as factory configuration option.
• All pre-configured systems:
– Are complete RAID systems
– Have both drives installed
– Have the necessary Option ROM configuration
– Are pre-loaded and pre-installed with all required Intel software
– Include a preinstalled operating system that is mirrored mode out of the box
• We also recommend keeping the default options in the RAID Option ROM and in the Windows RAID application. Options
like “chunk” size for changing the size “stripe” size have more history in their defaults settings.
Other supported configurations
HP rp7800, rp5810, and rp5800 Retail Systems support two other RAID configurations:
• Two-drive configuration:
– Two equal size/type SATA hard drive RAID configurations in RAID 0 or RAID 1 or Matrix Mode of RAID 0 and RAID 1.
– Maximum of two SATA optical drives (on HP rp7800, rp5810, and rp5800 Retail Systems).
• Three-drive configuration (only on some HP rp5810 and rp5800 Retail Systems):
– Three equal size/type SATA hard drive RAID configurations in RAID 0 or RAID 5 or Matrix Mode of RAID and RAID 5.
– Maximum of one SATA optical drives.
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