Intel RS25DB080 Hardware User Guide - Page 11

1 Overview The Intel® RAID Controller RS25DB080 is a high-performance intelligent PCI Express* 2.0 compliant SAS/SATA RAID controller that offers reliability, high performance, and fault-tolerant disk subsystem management. This is a RAID solution that meets the internal storage needs of workgroup, department, or enterprise systems to use with cost-effective SATA or high performance SAS media. As a second generation PCI Express* storage controller, the Intel® RAID Controller RS25DB080 addresses the growing demand for increased data throughput and scalability requirements across entry level, midrange, and enterprise server platforms. The controller controls 8 internal SAS/SATA ports through two SFF-8087 Mini SAS x4 internal connectors. For more information about the use of expanders, see the ANSI SAS Standard, version 2.0 specification. SATA and SAS are serial, point-to-point, device interfaces that use simplified cabling, smaller connectors, lower pin counts, and lower power requirements than parallel SCSI. The optional Intel® RAID Smart Battery AXXRSBBU9 provides cached data protection for the RAID controller, even during system failures. Benefits of SAS and SATA SAS is a serial, enterprise-level device interface that leverages the proven SCSI protocol set. SAS is a convergence of the advantages of SATA, SCSI, and FC, and is the future mainstay of the enterprise and high-end workstation storage markets. SAS offers a higher bandwidth per pin than parallel SCSI and improves signal and data integrity. The SAS interface uses the proven SCSI command set to ensure reliable data transfers, while providing the connectivity and flexibility of point-to-point serial data transfers. The serial transmission of SCSI commands eliminates clock skew challenges. The SAS interface provides improved performance, simplified cabling, smaller connectors, lower pin count, and lower power requirements than parallel SCSI. SAS controllers leverage a common electrical and physical connection interface that is compatible with Serial ATA technology. The SAS and SATA protocols use a thin, 7-wire connector instead of the 68-wire SCSI cable or 40-wire ATA cable. The SAS/SATA connector and cable are easier to manipulate, connect to smaller devices, and do not inhibit airflow. The point-to-point SATA architecture eliminates difficulties created by the legacy ATA master-slave architecture, while maintaining compatibility with existing ATA firmware. Intel® RAID Controller RS25DB080 Hardware User's Guide 1