Raid System Configuration; Raid - NEC Express5800 series User Manual

4-2
Configuring Your Storage and I/O Blade

RAID SYSTEM CONFIGURATION

This section describes how to use the internal hard disk drives as RAID System by Internal RAID
Controller.

RAID

Overview of RAID System
What is RAID (Redundant Array of Inexpensive Disks)?
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 Internal RAID Controller has a feature to divide a single disk group into several logical drives
(virtual disks). Operating system recognizes these virtual disks 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.