LSI MegaRAID 320 User Manual

USER’S

GUIDE

MegaRAID® 320 Storage Adapters

March 2008

80-00143-01 Rev. B

LSI products are not intended for use in life-support appliances, devices, or systems. Use of any LSI product in such applications without written consent of the appropriate LSI officer is prohibited.

Purchase of I Associated Companies, conveys a license under the Philips I use these components in an I

the I

C standard Specification as defined by Philips.

Document 80-00143-01 Rev. B, March 2008. This document describes the current version of the LSI Corporation MegaRAID 320 Storage Adapters and will remain the official reference source for all revisions/releases of these products until rescinded by an update.

LSI Corporation reserves the right to make changes to any products herein at any time without notice. LSI does not assume any responsibility or liability arising out of the application or use of any product described herein, except as expressly agreed to in writing by LSI; nor does the purchase or use of a product from LSI convey a license under any patent rights, copyrights, trademark rights, or any other of the intellectual property rights of LSI or third parties.

TRADEMARK ACKNOWLEDGMENT LSI, the LSI logo design, Fusion-MPT, and MegaRAID are trademarks or registered trademarks of LSI Corporation. Microsoft, Windows, and Windows NT are registered trademarks of Microsoft Corporation. Novell and NetWare are registered trademarks of Novell Corporation. UNIX and UnixWare are registered trademarks of The Open Group. SCO is a registered trademark of Caldera International, Inc. Linux is a registered trademark of Linus Torvalds. PCI-X is a registered trademark of PCI SIG. All other brand and product names may be trademarks of their respective companies.

C components of LSI Corporation, or one of its sublicensed

C Patent Rights to

C system, provided that the system conforms to

To receive product literature, visit us at http://www.lsi.com.

For a current list of our distributors, sales offices, and design resource centers, view our web page located at

http://www.lsi.com/contacts/index.html

Preface

This book is the primary reference and user’s guide for the LSI MegaRAID instructions for these adapters and includes specifications for them.

The MegaRAID 320 Storage Adapter family consists of the following:

• MegaRAID 320-1 PCI SCSI Disk Array Controller

• MegaRAID 320-2 PCI SCSI Disk Array Controller

320 Storage Adapters. It contains complete installation

Audience

• MegaRAID 320-2E PCI Express SCSI Disk Array Controller

• MegaRAID 320-2X PCI-X SCSI Disk Array Controller

• MegaRAID 320-4X PCI-X SCSI Disk Array Controller

For details on how to configure the Storage Adapters, and for an overview of the software drivers, see the MegaRAID Configuration Software User’s Guide.

This document assumes that you have some familiarity with RAID controllers and related support devices. The people who benefit from this book are:

• Engineers who are designing a MegaRAID 320 Storage Adapter into

a system

• Anyone installing a MegaRAID 320 Storage Adapter in their RAID

system

MegaRAID 320 Storage Adapters User’s Guide iii

Organization

This document has the following chapters and appendixes:

• Chapter 1, Overview, provides a general overview of the

MegaRAID 320 series of PCI-to-SCSI Storage Adapters with RAID control capabilities.

• Chapter 2, Hardware Installation, describes the procedures for

installing the MegaRAID 320-1, -2, -2E, -2X, and -4X Storage Adapters.

• Chapter 3, MegaRAID 320 Storage Adapter Characteristics,

provides the characteristics and technical specifications for the MegaRAID 320-1, 320-2, 320- 2E, 320-2X, and 320-4X Storage Adapters.

• Chapter 4, Installing and Configuring Clusters, explains how to

implement clustering to enable two independent servers to access the same shared data storage.

• Appendix A, Glossary of Terms and Abbreviations, lists and

explains the terms and abbreviations used in this manual.

Related Publications

MegaRAID Configuration Software User’s Guide, Document No. DB15-000269-01 (on the MegaRAID Universal Software Suite CD included with the MegaRAID 320 Storage Adapter)

MegaRAID Device Driver Installation User’s Guide, Document No. DB11-000018-02 (on the MegaRAID Universal Software Suite CD included with the MegaRAID 320 Storage Adapter)

iv Preface

Safety Instructions

Use the following safety guidelines to help protect your computer system from potential damage and to ensure your own personal safety.

When Using Your Computer System – As you use your computer system, observe the following safety guidelines:

Caution:

Do not operate your computer system with any cover(s) (such as computer covers, bezels, filler brackets, and front-panel inserts) removed:

• To help avoid damaging your computer, be sure the voltage selection

switch on the power supply is set to match the alternating current (AC) power available at your location:

– 115 volts (V)/60 hertz (Hz) in most of North and South America

and some Far Eastern countries such as Japan, South Korea, and Taiwan

– 230 V/50 Hz in most of Europe, the Middle East, and the Far East.

Also be sure your monitor and attached peripherals are electrically rated to operate with the AC power available in your location.

• To help avoid possible damage to the system board, wait 5 seconds

after turning off the system before removing a component from the system board or disconnecting a peripheral device from the computer.

• To help prevent electric shock, plug the computer and peripheral

power cables into properly grounded power sources. These cables are equipped with 3-prong plugs to ensure proper grounding. Do not use adapter plugs or remove the grounding prong from a cable. If you must use an extension cable, use a 3-wire cable with properly grounded plugs.

• To help protect your computer system from sudden, transient

increases and decreases in electrical power, use a surge suppressor, line conditioner, or uninterruptible power supply.

• Be sure nothing rests on your computer system’s cables and that the

cables are not located where they can be stepped on or tripped over.

• Do not spill food or liquids on your computer. If the computer gets

wet, consult the documentation that came with it.

Preface v

• Do not push any objects into the openings of your computer. Doing so

can cause fire or electric shock by shorting out interior components.

• Keep your computer away from radiators and heat sources. Also, do

not block cooling vents. Avoid placing loose papers underneath your computer; do not place your computer in a closed-in wall unit or on a rug.

When Working Inside Your Computer –

Notice:

1. Turn off your computer and any peripherals.

2. Disconnect your computer and peripherals from their power sources. Also disconnect any telephone or telecommunications lines from the computer.

Doing so reduces the potential for personal injury or shock.

Also note these safety guidelines:

Do not attempt to service the computer system yourself, except as explained in this guide and elsewhere in LSI Logic documentation. Always follow installation and service instructions closely.

• When you disconnect a cable, pull on its connector or on its

strain-relief loop, not on the cable itself. Some cables have a connector with locking tabs; if you are disconnecting this type of cable, press in on the locking tabs before disconnect the cable. As you pull connectors apart, keep them evenly aligned to avoid bending any connector pins. Also, before you connect a cable, make sure both connectors are correctly oriented and aligned.

• Handle components and cards with care. Don’t touch the

components or contacts on a card. Hold a card by its edges or by its metal mounting bracket. Hold a component such as a microprocessor chip by its edges, not by its pins.

Protecting Against Electrostatic Discharge – Static electricity can harm delicate components inside your computer. To prevent static damage, discharge static electricity from your body before you touch any of your computer’s electronic components, such as the microprocessor. You can do so by touching an unpainted metal surface, such as the metal around the card-slot openings at the back of the computer.

vi Preface

As you continue to work inside the computer, periodically touch an unpainted metal surface to remove any static charge your body may have accumulated. In addition to the preceding precautions, you can also take the following steps to prevent damage from electrostatic discharge (ESD):

• When unpacking a static-sensitive component from its shipping

carton, do not remove the component from the antistatic packing material until you are ready to install the component in your computer. Just before unwrapping the antistatic packaging, be sure to discharge static electricity from your body.

• When transporting a sensitive component, first place it in an

antistatic container or packaging.

• Handle all sensitive components in a static-safe area. If possible, use

antistatic floor pads and workbench pads.

Preface vii

viii Preface

Chapter 1 Overview

Contents

1.1 Overview 1-1

1.1.1 Operating System Support 1-3

1.1.2 Technical Support 1-3

1.2 Features 1-4

1.2.1 Memory 1-4

1.2.2 Connectors 1-4

1.2.3 RAID Features 1-4

1.2.4 Drive Roaming 1-5

1.2.5 Drive Migration 1-6

1.3 Hardware 1-6

Chapter 2 Hardware Installation

2.1 Requirements 2-1

2.2 Quick Installation 2-2

2.3 Detailed Installation 2-3

2.4 SCSI Device Cables 2-9

2.5 Replacing a Failed Controller with Data in the TBBU 2-15

2.6 After Installing the Storage Adapter 2-16

2.4.1 Internal SCSI Cables 2-9

2.4.2 External SCSI Cables 2-10

2.4.3 Connecting Internal SCSI Devices 2-11

2.4.4 Connecting External SCSI Devices 2-13

MegaRAID 320 Storage Adapters User’s Guide xv

Chapter 3 MegaRAID 320 Storage Adapter Characteristics

3.1 MegaRAID 320 Storage Adapter Family 3-1

3.1.1 Single-Channel Storage Adapter 3-2

3.1.2 Dual-Channel Storage Adapters 3-4

3.1.3 Quad-Channel Storage Adapter 3-10

3.2 MegaRAID 320 Storage Adapter Characteristics 3-12

3.3 Technical Specifications 3-12

3.3.1 Storage Adapter Specifications 3-13

3.3.2 Array Performance Features 3-15

3.3.3 Fault Tolerance 3-16

3.3.4 Electrical Characteristics 3-17

3.3.5 Thermal and Atmospheric Characteristics 3-17

3.3.6 Safety Characteristics 3-17

Chapter 4 Installing and Configuring Clusters

4.1 Overview 4-1

4.2 Benefits of Clusters 4-2

4.3 Installing and Configuring Your System as Part of

a Cluster 4-2

4.4 Driver Installation Instructions under Microsoft

Windows 2000 Advanced Server 4-4

4.4.1 Network Requirements 4-4

4.4.2 Shared Disk Requirements 4-5

4.5 Installing the Peer Processor Device in a Windows

Cluster 4-6

4.6 Installing SCSI Drives 4-12

4.6.1 Configuring the SCSI Devices 4-12

4.6.2 Terminating the Shared SCSI Bus 4-12

4.7 Installing Clusters under Windows 2000 4-13

4.7.1 Installing the Microsoft Windows 2000 Operating System 4-14

4.7.2 Setting Up Networks 4-14

4.7.3 Configuring the Cluster Node Network Adapter 4-15

4.7.4 Setting Up the First Node in Your Cluster 4-16

4.7.5 Configuring the Public Network Adapter 4-17

xvi Contents

4.7.6 Verifying Connectivity and Name Resolution 4-18

4.7.7 Verifying Domain Membership 4-19

4.7.8 Setting Up a Cluster User Account 4-20

4.7.9 Setting Up Shared Disks 4-21

4.7.10 Configuring Shared Disks 4-21

4.7.11 Assigning Drive Letters 4-22

4.7.12 Verifying Disk Access and Functionality 4-23

4.7.13 Installing Cluster Service Software 4-24

4.7.14 Configuring Cluster Disks 4-27

4.7.15 Validating the Cluster Installation 4-33

4.7.16 Configuring the Second Node 4-34

4.7.17 Verifying Installation 4-35

4.8 Installing Clusters under Windows Server 2003 4-36

4.8.1 Cluster Service Software Installation 4-36

4.8.2 Installation Checklist 4-36

4.8.3 Shared Disk Requirements 4-38

4.8.4 Steps for Configuring the Shared Disks under Windows Server 2003 4-39

4.8.5 Cluster Service Installation Steps 4-45

4.8.6 Validating the Cluster Installation 4-55

4.8.7 Configuring the Second Node 4-58

Appendix A Glossary of Terms and Abbreviations

Customer Feedback

Contents xvii

xviii Contents

Figures

2.1 Inserting the MegaRAID 320 Card in a PCI Slot 2-4

2.2 Inserting the MegaRAID 320-2E Card in a PCI-Express Slot 2-5

2.3 Terminating an Internal SCSI Disk Array 2-8

2.4 SCSI Cable – 68-Pin High Density with Terminator 2-10

2.5 SCSI Cable – 68-Pin High Density without Terminator 2-10

2.6 SCSI Cable – 68-Pin VHDCI to 68-Pin VHDCI 2-10

2.7 SCSI Cable – 68-Pin VHDCI to 68-Pin HD 2-10

2.8 SCSI Cable – 68-Pin HD to 68-Pin HD 2-11

2.9 Connecting an Internal SCSI Cable to Host Adapter 2-11

2.10 Connecting Multiple Internal SCSI Devices 2-12

2.11 Connecting One External SCSI Device 2-13

2.12 Connecting Multiple External SCSI Devices 2-14

3.1 MegaRAID 320-1 Card Layout 3-2

3.2 MegaRAID 320-2 Card Layout 3-4

3.3 MegaRAID 320-2E Card Layout 3-6

3.4 MegaRAID 320-2X Card Layout 3-8

3.5 MegaRAID 320-4X Card Layout 3-10

4.1 Found New Hardware Wizard Dialog Box 4-7

4.2 Search and Installation Options 4-8

4.3 Hardware Type Dialog Box 4-9

4.4 Hardware Device Manufacturer and Model 4-10

4.5 Device Driver Dialog Box 4-11

4.6 Network and Dial-up Connections Screen 4-15

4.7 Create or Join a Cluster Dialog Box 4-25

4.8 User Account and Password Validation 4-26

4.9 Add or Removed Managed Disks Screen 4-27

4.10 Configure Cluster Networks Dialog Box 4-28

4.11 Network Connections Dialog Box 4-29

4.12 Network Connections Dialog Box 4-30

4.13 Internal Cluster Communication Dialog Box 4-31

4.14 Cluster IP Address Dialog Box 4-32

4.15 Cluster Service Confirmation 4-33

4.16 Cluster Administrator Screen 4-35

4.17 Computer Management Screen 4-39

4.18 Initialize and Convert Disk Wizard 4-40

Contents xvii

4.19 Disk Management Screen 4-41

4.20 Select Partition Type Screen 4-42

4.21 Final Partition Wizard Screen 4-43

4.22 Computer Management 4-44

4.23 Cluster Administrator Screen 4-46

4.24 New Server Cluster Wizard Screen 4-47

4.25 Cluster Name and Domain Screen 4-48

4.26 Select Computer Screen 4-49

4.27 Configuration Analysis Screen 4-50

4.28 IP Address Screen 4-51

4.29 Cluster Service Account Screen 4-52

4.30 Proposed Cluster Configuration Screen 4-53

4.31 Creating the Cluster Screen 4-54

4.32 Selecting Properties in Cluster Administrator 4-55

4.33 Setting the Network Priority 4-56

4.34 Private Properties 4-58

4.35 Validating Cluster Administration on the Cluster Administrator 4-59

4.36 Open Connection to Cluster Window 4-60

4.37 Select Computers Dialog Box 4-61

4.38 Cluster Service Account Dialog Box 4-62

4.39 Cluster Administrator Screen 4-63

xviii Contents

Tabl es

1.1 MegaRAID 320 Storage Adapter Comparisons 1-6

2.1 Target IDs 2-6

3.1 MegaRAID 320-1 Headers and Connectors 3-3

3.2 MegaRAID 320-2 Headers and Connectors 3-5

3.3 MegaRAID 320-2E Headers and Connectors 3-7

3.4 MegaRAID 320-2X Headers and Connectors 3-9

3.5 MegaRAID 320-4X Headers and Connectors 3-10

3.6 Storage Adapter Characteristics 3-12

3.7 Storage Adapter Specifications 3-13

3.8 Array Performance Features 3-15

3.9 MegaRAID 320 Fault Tolerance Features 3-16

3.10 Maximum Power Requirements 3-17

4.1 Nodes and Storage Devices 4-13

4.2 Example IP Addresses 4-19

4.3 Nodes and Storage Devices 4-45

Contents xix

xx Contents

Chapter 1 Overview

This section provides a general overview of the MegaRAID 320 series of PCI-to-SCSI Storage Adapters with RAID control capabilities. It consists of the following sections.

• Section 1.1, “Overview”

• Section 1.2, “Features”

• Section 1.3, “Hardware”

1.1 Overview

The MegaRAID 320 Storage Adapters are high-performance intelligent PCI-to-SCSI host adapters with RAID control capabilities. MegaRAID 320 Storage Adapters provide reliability, high performance, and faulttolerant disk subsystem management. They are an ideal RAID solution for the internal storage of workgroup, departmental, and enterprise systems. MegaRAID 320 Storage Adapters offer a cost-effective way to implement RAID in a server.

MegaRAID 320 Storage Adapters are available with one, two, or four SCSI channels. There are two versions of the MegaRAID 320-1 Storage Adapter. The following are descriptions of the adapters:

• The MegaRAID 320-1 Storage Adapter (single-channel) has one

LSI53C1020 controller chip that controls one SCSI channel. The Storage Adapter has one very high-density cable interconnect (VHDCI) 68-pin external SCSI connector and one high-density cable interconnect (HDCI) 68-pin internal SCSI connector.

MegaRAID320 Storage Adapters User’s Guide 1-1

• The MegaRAID 320-2 Storage Adapter (dual-channel) has one

LSI53C1030 controller chip that controls two SCSI channels. The Storage Adapter has two VHDCI 68-pin external SCSI connectors and two HDCI 68-pin internal SCSI connectors.

• The MegaRAID 320-2E (Express) Storage Adapter has one 80332

processor that controls two SCSI channels. The Storage Adapter has two UHDCI 68-pin external SCSI connectors and two HDCI 68-pin internal SCSI connectors. Note that the MegaRAID 320-2E is a PCI-Express controller.

• The MegaRAID 320-2X Storage Adapter (dual-channel) has one

LSI53C1030 controller chip that controls two SCSI channels. The Storage Adapter has two VHDCI 68-pin external SCSI connectors and two HDCI 68-pin internal SCSI connectors. Note that the MegaRAID 320-2X is a PCI-X controller.

• The MegaRAID 320-4X Storage Adapter (quad-channel) has two

LSI53C1030 controller chips that control the four SCSI channels. The Storage Adapter has four VHDCI 68-pin external SCSI connectors and two HDCI 68-pin internal SCSI connectors. Note that the MegaRAID 320-4X is a PCI-X controller.

The MegaRAID 320 Storage Adapters support a low-voltage differential (LVD) or a single-ended (SE) SCSI bus. With LVD, you can use cables up to 12 meters long. Throughput on each SCSI channel can be as high as 320 Mbytes/s.

PCI, PCI-X, and PCI-Express are I/O architectures designed to increase data transfers without slowing down the central processing unit (CPU). You can install the MegaRAID 320 PCI and PCI-X Storage Adapters in PCI-X computer systems with a standard bracket type. With these adapters in your system, you can connect SCSI devices over a SCSI bus.

PCI-Express goes beyond the PCI specification in that it is intended as a unifying I/O architecture for various systems: desktops, workstations, mobile, server, communications, and embedded devices.

Note:

For Ultra320 SCSI performance, you must connect only LVD devices to the bus. Do not connect a high voltage differential (HVD) device to the controller. Do not mix SE with LVD devices, or the bus speed will be limited to the slower SE (Ultra SCSI) SCSI data transfer rates.

1-2 Overview

1.1.1 Operating System Support

The MegaRAID 320 Storage Adapters support major operating systems, such as Windows

SuSe Other software support ensures data integrity by intelligently testing the network before completing negotiation.

Linux, Novell® NetWare®, SCO OpenServer®, and UnixWare®.

(2000, Server 2003, and XP), Red Hat® Linux,

Note:

The MegaRAID 320 Storage Adapters use Fusion-MPT™ architecture for all major operating systems for thinner drivers and better performance. Refer to the MegaRAID Device Driver Installation User’s Guide for driver installation instructions.

1.1.2 Technical Support

For assistance installing, configuring, or running a MegaRAID 320 RAID controller or obtaining a driver for an operating system other than the ones already listed in Section 1.1.1, “Operating System Support,” contact LSI Technical Support:

For assistance in installing, configuring, or running your SAS RAID controller, contact LSI Technical Support.

Phone Support:

The MegaRAID 320 Storage Adapters do not support the Windows NT

operating system.

1-800-633-4545 (North America)

Web Site:

http://www.lsi.com/support

Overview 1-3

1.2 Features

1.2.1 Memory

The following sections describe the features of the LSI MegaRAID 320 Storage Adapters.

The memory features include:

• 64 Mbytes of synchronous dynamic random access memory

(SDRAM) integrated on the board on the MegaRAID 320-1

• Support for up to 256 Mbytes of SDRAM; a 128- or 256-Mbyte DIMM

can be installed on the MegaRAID 320-2 and 320-4X

• Support for up to 256 Mbytes of SDRAM; a 256-Mbyte DIMM can be

installed on the MegaRAID 320-2X

• Support for up to 512 Mbytes of double data rate (DDR) SDRAM; a

• Support for a 64-bit PCI host interface for the MegaRAID 320-2, 320-

1.2.2 Connectors

The MegaRAID 320 connector features include:

• One internal and one external SCSI connector for the

• Two internal and two external SCSI connectors for the

• Two internal and four external SCSI connectors for the

128-, 256-, or 512-Mbyte DIMM can be installed on the MegaRAID 320-2E

2E, 320-2X, and 320-4X (note that the 320-2X and -4X are PCI-X controllers and the 320-2E is a PCI Express controller.)

MegaRAID 320-1

MegaRAID 320-2, 320-2E, and 320-2X

MegaRAID 320-4X

1.2.3 RAID Features

The MegaRAID 320 RAID controllers support the following RAID features:

• Support for RAID levels 0, 1, 5, 10, and 50

1-4 Overview

• Advanced array configuration and management utilities

• Online RAID level migration

• No reboot necessary after expansion

• Support for hard drives with capacities greater than 8 Gbytes

• More than 200 Qtags per array

• User-specified rebuild rate

• Hardware clustering support on the board

Note:

The MegaRAID 320-2, -2E, -2X, and -4X Storage Adapters support clustering; the MegaRAID 320-1 Storage Adapter does not. See Chapter 4, “Installing and Configuring

Clusters” for more information about clustering.

• Wide Ultra320 LVD SCSI performance up to 320 Mbytes/s

• Support for up to 14 SCSI drives per channel on storage system with

SAF-TE enclosures (SCSI accessed fault-tolerant enclosures), 15 SCSI drives per channel for other configurations

• 32 Kbyte NVRAM for storing RAID system configuration information;

the MegaRAID 320 firmware is stored in Flash ROM for easy upgrade

• Battery backup for MegaRAID 320-2, -2E, -2X, and -4X

Note:

Battery backup is available for the MegaRAID 320-1, 320-2, 320-2E, 320-2X, and 320-4X controllers, either through an onboard battery or daughter card. You can purchase the controller with the battery backup unit (BBU) or purchase the BBU separately.

1.2.4 Drive Roaming

Drive roaming occurs when the hard drives are moved within a configuration on the controller. When the drives are moved, the controller detects the RAID configuration from the configuration information on the drives. Configuration information is saved in both nonvolatile random access memory (NVRAM) on the MegaRAID controller and on the hard drives attached to the controller. This maintains the integrity of the data on each drive, even if the drives have changed their target ID.

Important:

Features 1-5

Before performing drive roaming, make sure to power off

both your platform and your drive enclosure.

1.2.5 Drive Migration

Drive migration is the transfer of a set of hard drives in an existing configuration from one controller to a blank controller. The drives must be reinstalled in the same order as in the original configuration.

Important:

Do not perform drive roaming and drive migration at the same time.

1.3 Hardware

You can install the MegaRAID 320-1 and 320-2 boards in a computer with a mainboard that has 5 V or 3.3 V, 32- or 64-bit PCI slots, the MegaRAID 320-2X and -4X in 3.3 V, 64-bit PCI or PCI-X slots, and the MegaRAID 320-2E in 3.3 V PCI-Express slots.

The following subsection describes the hardware configuration features for the MegaRAID 320 Storage Adapters.

Storage Adapter Features – Tab le 1 .1 compares the configurations

for the MegaRAID 320-1, 320-2, 320-2E, 320-2X, and 320-4X Storage Adapters.

Table 1.1 MegaRAID 320 Storage Adapter Comparisons

MegaRAID

Specification

RAID Levels 0, 1, 5, 10, 50 0, 1, 5, 10, 50 0, 1, 5, 10, 50 0, 1, 5, 10, 50 0, 1, 5, 10, 50

SCSI Device Types

Devices per SCSI Channel

SCSI Channels 1 2 2 2 4

SCSI Data Transfer Rate

SCSI Bus LVD o r S E LVD o r S E LVD o r S E LVD o r S E LVD o r S E

1-6 Overview

320-1

Synchronous or Asynchronous

Up to 15 Wide SCSI devices

Up to 320 Mbytes/s per channel

MegaRAID 320-2

Synchronous or Asynchronous

Up to 15 Wide SCSI devices

Up to 320 Mbytes/s per channel

MegaRAID 320-2E

Synchronous or Asynchronous

Up to 15 Wide SCSI devices

Up to 320 Mbytes/s per channel

MegaRAID 320-2X

Synchronous or Asynchronous

Up to 15 Wide SCSI devices

Up to 320 Mbytes/s per channel

MegaRAID 320-4X

Synchronous or Asynchronous

Up to 15 Wide SCSI devices

Up to 320 Mbytes/s per channel

Table 1.1 MegaRAID 320 Storage Adapter Comparisons (Cont.)

MegaRAID

Specification

Cache Function Write-back,

Multiple Logical Drives/Arrays per Controller

Online Capacity Expansion

Dedicated and Pool Hot Spare

Hot Swap Devices Supported

320-1

Write-through, Adaptive Read Ahead, Non-Read Ahead, Read Ahead, Cache I/O, Direct I/O