Technical Reference Guide www.hp.com 5-3
Input/Output Interfaces
RAID 1—Mirroring with Two Hard Drives
RAID 1 uses to mirroring to increase storage reliability with minimal impact on performance.
Reliability of the storage system is calculated bythe MTBF of an individual drive multiplied by
the total number of drives.
Factory Configuration for RAID 1
These systems may be ordered preconfigured from the factory for RAID 1 as follows:
■ Two identical SATA hard drives installed
■ System BIOS ROM and option ROM preconfigured
■ Windows operating system and drivers preloaded and set to mirrored mode
Implementing AHCI RAID for Non-Factory Configurations
CAUTION: Changing the system BIOS ROM SATA Emulation setting from IDE to AHCI RAID is
equivalent to re-connecting the hard drive(s) to a new add-on RAID storage controller. If the
original (factory) software image has been replaced and the appropriate RAID driver is not
installed, the system will not boot. The RAID driver is available from http://www.hp.com.
✎
Applying the default system BIOS ROM settings DOES NOT change the SATA Emulation
setting. The SATA Emulation setting can only be changed manually.
Configuring a system for AHCI RAID operation requires the following:
For single-drive systems:
In the system ROM (accessed by F10 during boot) set the SATA Emulation mode to AHCI RAID.
For multiple-drive systems:
a. In the system ROM (accessed by F10 during boot) set the SATA Emulation mode to AHCI
RAID.
b. In the option ROM (accessed by Ctrl + F during boot) configure the hard drives as necessary.
✎
Hard drives in a RAID array must match as to size, speed, technology (1.5 GB or 3.0 GB and
NCQ or non-NCQ), and cache size.
Detailed information on configuring these systems for RAID operations is contained in the white
paper “AHCI and RAID on HP Compaq dc5850 Business PCs and Using AMD Array
Management Software (RAIDXpert)” available at http://www.hp.com.
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