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12Gb/s MegaRAID SAS Software User Guide

March 2014
Chapter 1: Overview
SAS Technology
Chapter 1: Overview
This chapter provides an overview of this guide, which documents the utilities used to configure, monitor, and
maintain MegaRAID® Serial-attached SCSI (SAS) RAID controllers with RAID control capabilities and the
storage-related devices connected to them.
This guide describes how to use the MegaRAID Storage Manager™ software, the Ctrl- R utility, the StorCLI software
and the LSI® MegaRAID® Human Interface Infrastructure (HII) configuration utility.
This chapter documents the SAS technology, Serial ATA (SATA) technology, MegaRAID CacheCade® software, SSD
Guard™, Dimmer Switch®, UEFI 2.0, configuration scenarios, and drive types. Other features such as Fast Path and
SafeStore™ are described in other chapters of this guide.
1.1 SAS Technology
The MegaRAID 12Gb/s SAS RAID controllers are high-performance intelligent PCI Express-to-SAS/Serial ATA II
controllers with RAID control capabilities. The MegaRAID 12Gb/s SAS RAID controllers provide reliability, high
performance, and fault-tolerant disk subsystem management. They are an ideal RAID solution for the internal storage
of workgroup, departmental, and enterprise systems. The MegaRAID 12Gb/s SAS RAID controllers offer a
cost-effective way to implement RAID in a server.
SAS technology brings a wealth of options and flexibility with the use of SAS devices, Serial ATA (SATA) II devices, and
CacheCade SSD Read Caching software devices within the same storage infrastructure. These devices bring individual
characteristics that make each of these more suitable choice depending on your storage needs. MegaRAID gives you
the flexibility to combine these two similar technologies on the same controller, within the same enclosure, and in the
same virtual drive.
NOTE Carefully assess any decision to combine SAS drives and SATA drives
within the same virtual drives. Avoid mixing drives; this applies to both
HDDs and CacheCade SSD Read Caching software.
The MegaRAID 12Gb/s SAS RAID controllers are based on the LSI® first-to-market SAS IC technology and proven
MegaRAID technology. As second-generation PCI Express RAID controllers, the MegaRAID SAS RAID controllers
address the growing demand for increased data throughput and scalability requirements across midrange and
enterprise-class server platforms. LSI offers a family of MegaRAID SAS RAID controllers addressing the needs for both
internal and external solutions.
The SAS controllers support the ANSI Serial Attached SCSI standard, version 2.1 . In addition, the controller supports the
SATA II protocol defined by the Serial ATA specification, version 3.0 . Supporting both the SAS and SATA II interfaces, the
SAS controller is a versatile controller that provides the backbone of both server environments and high-end
workstation environments.
Each port on the SAS RAID controller supports SAS devices or SATA III devices using the following protocols:

SAS Serial SCSI Protocol (SSP), which enables communication with other SAS devices
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SATA III, which enables communication with other SATA III devices
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Serial Management Protocol (SMP), which communicates topology management information directly with an
attached SAS expander device

Serial Tunneling Protocol (STP), which enables communication with a SATA III device through an attached
expander