LSI Corporation
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6Gb/s MegaRAID SAS RAID Controllers User Guide
August 2012
Chapter 1: Overview
Summary of 6Gb/s MegaRAID SATA+SAS RAID Controller Characteristics
1.6.3 SATA III Features
The following list describes the SATA III features of the RAID controllers:
They support SATA III data transfers of 3Gb/s (for LSISAS2108-based controllers) and 6Gb/s (for
LSISAS2208-based controllers).
They support STP data transfers of 3Gb/s.
They provide a serial, point-to-point storage interface.
They simplify cabling between devices.
They eliminate the master-slave construction used in parallel ATA.
They permit addressing of multiple SATA targets through an expander.
They permit multiple initiators to address a single target (in a failover configuration) through an expander.
1.6.4 PCI Express Performance
The following list describes the PCI Express performance features of the RAID controllers:
They provide a PCI Express interface that does the following:
— Supports a dedicated PCI Express bus.
— Supports x8 lane configuration.
— Supports transfer rates of up to 5GT/s (4Gb/s) per lane.
— Complies with the PCI Express specification, Revision 2.0, and the Serial ATA specification, version 3.0.
They provide unequaled performance through the Fusion-MPT architecture.
They provide high throughput and low CPU utilization to offload the host processor.
1.6.5 Usability Features
The following list describes the usability features of the RAID controllers:
They simplify cabling with point-to-point, serial architecture.
They support smaller, thinner cables that do not restrict airflow.
They provide drive spin-up sequencing control.
They provide one LED signal for each PHY to indicate link activity (this is a fault LED only for controllers with
internal port connectors).
They provide an I
2
C interface for enclosure management.
They support the internal SAS Sideband signal SFF-8485 (SGPIO) interface.
1.6.6 Flexibility Features
These features increase the flexibility of the RAID controllers:
They support a Flash ROM interface, a nonvolatile static RAM (NVSRAM) interface, and a pipelined synchronous
burst SRAM (PSBRAM) interface.
They offer a flexible programming interface to tune I/O performance.
They permit mixed connections to SAS targets or SATA III targets.
They leverage compatible connectors for SAS connections and SATA III connections.
NOTE The MegaRAID SAS 9280-8e RAID controller and the MegaRAID SAS 9280DE-8e RAID controller do
not have any LEDs to indicate link activity.
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