LSI Logic megaraid sas 9361-8i kit [8/45] Figure 1 example of an lsi sas direct connect application

LSI Logic megaraid sas 9341-8i sgl [8/45] Figure 1 example of an lsi sas direct connect application
Avago Technologies
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12Gb/s MegaRAID SAS RAID Controllers User Guide
February 2015
Chapter 1: Overview
Benefits of the SAS Interface
Figure 1 Example of an LSI SAS Direct-Connect Application
The following figure shows an example of a SAS RAID controller configured with an LSISASx12 expander that is
connected to SAS drives, SATA III drives, or both.
Figure 2 Example of an LSI SAS RAID Controller Configured with an LSISASx12 Expander
1.5 Benefits of the SAS Interface
SAS is a serial, point-to-point, enterprise-level device interface that leverages the proven SCSI protocol set. SAS is a
convergence of the advantages of SATA, SCSI, and Fibre Channel, and it is the future mainstay of the enterprise and
high-end workstation storage markets. SAS offers a higher bandwidth per pin than parallel SCSI, and it 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 when compared to parallel SCSI.
SAS controllers leverage a common electrical and physical connection interface that is compatible with Serial ATA
technology. The SAS protocols and the SATA III protocols use a thin, 7-wire connector instead of the 68-wire SCSI cable
or 26-wire ATA cable. The SAS/SATA III connector and cable are easier to manipulate, allow connections to smaller
devices, and do not inhibit airflow. The point-to-point SATA III architecture eliminates inherent difficulties created by
the legacy ATA master-slave architecture, while maintaining compatibility with existing ATA firmware.
SAS
PCI Express
RAID Controller
SAS/SATA III Device
I
2
C
SAS/SATA III Device
SAS/SATA III Device
SAS/SATA III Device
PCI Express Interface
I
2
C
Interface
NVSRAM
Flash ROM/
Peripheral Bus
LSISASx12
Flash ROM/
NVSRAM/
SRAM
I
2
C/UART
LSISASx12
PCI Express Interface
8
SRAM
SRAMSDRAM
Peripheral
Bus
72-bit DDR3
with ECC
Interface
LSISAS3108
PCI Express to SAS ROC
SAS
RAID Controller
Expander
Expander

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