User`s guide

1-4 Overview
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external SAS/SATA ports through two SFF-8088 Mini SAS x4
external connectors.
• The MegaRAID 6Gb/s SAS 9280DE-8e PCI Express 2.0 Low-Profile
Serial-Attached SCSI/SATA II Disk Array Controller controls eight
external SAS/SATA ports through two SFF-8088 Mini SAS x4
external connectors and offers data security using disk encryption.
1.3 General Description
The MegaRAID 6Gb/s SAS RAID controllers bring 6.0 Gb/s Serial
Attached SCSI and 3.0 Gb/s SATA II performance to host adapter,
workstation, and server designs. The controllers support internal and
external storage devices, which allow you to use a system that supports
enterprise-class SAS drives and desktop-class SATA II drives. Each
MegaRAID 6Gb/s SAS RAID controller can connect to drives directly and
can use expanders to connect to additional drives. Simplified cabling
between devices is an additional benefit.
These SAS controllers are based on the LSISAS2108 RAID On-a-Chip
(ROC) device. This device is compliant with the Fusion-MPT™
architecture and provides a PCI Express x8 interface.
Note:
All of these RAID controllers provide an x8 PCI Express 2.0
interface.
The LSISAS2108 ROC device provides an eight-lane, 5-Gb/s PCI
Express host interface, eight 6.0 Gb/s SAS ports or eight 3.0 Gb/s SATA
ports, and a full-featured, hardware-based RAID implementation. In
addition, it integrates a high-speed DDR/DDR2 800 MHz SDRAM
interface with a hardware RAID assist engine for parity calculations. The
LSISAS2108 ROC device provides the maximum benefits of a RAID
system and enables you to configure the system to satisfy your system
requirements.
The LSISAS2108 ROC device increases system performance and
provides fault-tolerant data storage. The LSISAS2108 supports data
striping across multiple drives, which reduces drive access time because
multiple drives simultaneously read or write data. The LSISAS2108 ROC
device backs up data with either data mirroring or a parity block. Either
backup method enables you to recover lost data in the event of a drive