Raid System Configuration; Raid - NEC Express5800 User Manual

4-34 Configuring Your Server

RAID SYSTEM CONFIGURATION

This section describes how to use the internal hard disk drives as RAID System by Onboard RAID
Controller (LSI Embedded MegaRAID).
About the optional RAID Controller (N8103-109/116A/117A), refer to the documents provided
with optional RAID Controller.

RAID

Overview of RAID System
What is RAID (Redundant Array of Inexpensive Disks)?
RAID is an abbreviation for "Redundant Array of Inexpensive Disks". The RAID technology allows
more than one hard disk drive (HDD) to be handled collectively.
In actual, RAID can configure more than one HDDs as a single array (disk group) to operate the
HDDs effectively. This can bring higher performance than a single HDD of a large capacity.
The Onboard RAID Controller (LSI Embedded MegaRAID) has a feature to divide a single disk
group into several logical drives (virtual disks). Operating system recognizes these logical drives as
if it were a single hard disk drive. Operating system accesses to more than one hard disk drive
configuring a disk group in parallel.
Some RAID levels can recover data from remaining data and parity by using rebuild feature if an
error occurs in a single HDD. This can provide high reliability for the system.