Server Products
Intel® RAID Controllers
How and Where Does the Controller Support 12-Gbps SAS or 6G SATA Data Transfers?

The controllers provide independent PHYs. Each PHY supports SAS link rates of 3 Gb/s, 6 Gb/s, and 12 Gb/s, and SATA link rates of 3 Gb/s and 6 Gb/s. Each of the controller PHYs connect to one controller port.

Direct connect (port-to-port) disk drives can take advantage of the stated data transfer capability. Connecting one controller port to an expander backplane provides the maximum data transfer capability per backplane connection.

Intel 12 Gb RAID controllers connected to a 12 Gb expander which is then connected to 6 Gb drives will show a 12 Gb port connection speed in the RAID configuration utilities Intel® RAID Web Console 2 and the RAID BIOS configuration utility. This is because from the controller’s point of view, it has a 12 Gb connection to the expander. From the expander point of view, it has a 12 Gb connection to the controller but a 6 Gb connection to the drives; and the expander is consolidating the 6 Gb dataflow in and out of the drives into a 12 Gb stream in and out of the controller. So from the controller point of view, it only aware of a 12 Gb connection.

Note A PHY connects a link layer device to a physical medium such as a SAS or SATA cable. A PHY typically includes a PCS and a PMD layer. The PCS encodes and decodes the data that is transmitted and received. The purpose of the encoding is to make it easier for the receiver (disk drive) to recover the signal.

This applies to:

Intel® Integrated RAID Module RMS3CC040
Intel® Integrated RAID Module RMS3CC080
Intel® Integrated RAID Module RMS3HC080
Intel® Integrated RAID Module RMS3JC080
Intel® RAID Controller RS3DC040
Intel® RAID Controller RS3DC080
Intel® RAID Controller RS3FC044
Intel® RAID Controller RS3GC008
Intel® RAID Controller RS3MC044
Intel® RAID Controller RS3SC008
Intel® RAID Controller RS3UC080
Intel® RAID Controller RS3WC080

Solution ID: CS-034439
Last Modified: 14-Jan-2015
Date Created: 24-Jul-2013
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