Increased Reliability; Megaraid Scsi 320-2 - Host-Based Raid Solution; Host-Based Raid - LSI MegaRAID SCSI 320-2 RAID Controller Series 518 Hardware Manual

2.1.2

Increased Reliability

2.2 MegaRAID SCSI 320-2 – Host-Based RAID Solution
2.2.1

Host-Based RAID

2-2
The electromechanical components of a disk subsystem operate more
slowly, require more power, and generate more noise and vibration than
electronic devices. These factors reduce the reliability of data stored on
disks. RAID provides a way to achieve much better fault tolerance and
data reliability.
RAID products are either host-based or external.
The MegaRAID SCSI 320-2 controller is a host-based RAID solution.
The MegaRAID SCSI 320-2 is a PCI adapter card that is installed in any
available PCI expansion slot in a host system.
A host-based RAID product puts all of the RAID intelligence on an
adapter card that is installed in a network server. A host-based RAID
product provides the best performance. MegaRAID SCSI 320-2 is part of
the file server, so it can transmit data directly across the computer's
buses at data transfer speeds up to 532 Mbytes/s.
The available sequential data transfer rate is determined by the following
factors:
The sustained data transfer rate on the motherboard PCI bus
The sustained data transfer rate on the PCI-to-PCI bridge
The sustained data transfer rate of the SCSI controller
The sustained data transfer rate of the SCSI devices
The number of SCSI channels
The number of SCSI disk drives
Host-based solutions must provide operating system-specific drivers.
Introduction to RAID
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