Disk Array Configuration; Raid - NEC BladeServer Express5800 Series User Manual

4-28 Configuring Your Server

DISK ARRAY CONFIGURATION

This section describes the configuration utility "WebBIOS". With on-board RAID (LSI Logic
MegaRAID SAS PCI EXPRESS ROMB), you can use the internal hard disk drives in the disk
array configuration.

RAID

This section describes the RAID features which the on-board RAID controller (LSI Logic
MegaRAID SAS PCI EXPRESS ROMB) supports.
Overview of RAID
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 on-board RAID (LSI Logic MegaRAID SAS PCI EXPRESS ROMB) has a feature to
divide a single disk group into several logical drives (virtual disks). The on-board RAID (LSI Logic
MegaRAID SAS PCI EXPRESS ROMB) recognizes these virtual disks as if it were a single
HDD. The on-board RAID (LSI Logic MegaRAID SAS PCI EXPRESS ROMB) accesses to
more than one HDD 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.