HP EliteDesk 705 G1 Micro Advanced Host Controller Interface AHCI and Redundan - Page 6

Recommended configurations for HP EliteDesk and EliteOne 705 Business PCs For best reliability, HP recommends factory configurations of the preinstalled RAID1. • The preinstalled RAID1 offering is a RAID 1 volume of two identical SATA hard drives or solid-state drives. You can select from a number of different SATA drive sizes. NOTE: HP EliteDesk and EliteOne 705 Business PCs support Microsoft Windows operating systems. HP EliteDesk and EliteOne 705 Business PCs are based on the AMD D4 chipset, which is a combined hardware and software RAID solution. The mass storage controller operates in either AHCI or RAID mode. Changing the mode of the controller changes the PCI device ID and class code, requiring different device drivers in most operating systems. HP recommends AMD drivers for HP Business PC products, including all supported RAID configurations. WARNING: The PCI Device ID of the mass storage controller changes after changing the BIOS "SATA Emulation" Computer Setup option. Changing SATA Emulation 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 installed, the operating system will fail to boot. For example, All Microsoft OSs will cause a blue screen and/or reboot when attempting to boot in RAID mode without the RAID drivers installed. Other supported configurations HP EliteDesk and EliteOne 705 Business PC products support two other RAID configurations: • Two drive configuration. - Two equal size/type SATA drive RAID configurations in RAID 0 or RAID 1. - Maximum of two SATA optical drives. • Three drive configuration (only on HP EliteDesk 705 Microtower). - Three equal size/type SATA drive RAID configurations in RAID 0. - Maximum of one SATA optical drive. - NOTE: RAID 5 is not supported. Unsupported configurations HP EliteDesk and EliteOne 705 Business Desktop PC products only support the best user experience and highest possible reliability. As a result, HP does not support the following combinations of RAID hard drives: • Different sizes. • Different speeds (5400 rpm, 7200 rpm, etc.). • Old and new technologies (SATA 1.5 GB and SATA 3.0 GB). • NCQ hard drives and non-NCQ drives. • RAID combinations of hard drives with any operating system other than Microsoft Windows. • RAID configurations of two or more 10,000 RPM hard drives. • Any other RAID modes besides RAID 0 and RAID 1. Configuring RAID on non-factory preinstalled configurations The remaining sections of this white paper describe steps to set up supported RAID configurations where customers have not purchased factory preinstalled RAID configurations. WARNING: Before configuring RAID in the Option ROM interface, be sure to back up all data. Once a RAID configuration is saved, all data will be erased and the drives will no longer be bootable until an operating system is re-installed. 6