ASUS PIKE 1078 User Manual

PIKE 1078
LSISAS1078 SAS RAID card
E3735
First Edition V1 June 2008
Copyright © 2008 ASUSTeK COMPUTER INC. All Rights Reserved.
Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless such repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of the
product is defaced or missing.
ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS, LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE), EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
Products and corporate names appearing in this manual may or may not be registered trademarks or
copyrights of their respective companies, and are used only for identication or explanation and to the owners’ benet, without intent to infringe.
ii

Contents

Contents ...................................................................................................... iii
About this guide ......................................................................................... iv
PIKE 1078 specications summary .......................................................... vi
Chapter 1: Product introduction
1.1 Welcome! ...................................................................................... 1-2
1.2 Package contents ......................................................................... 1-2
1.3 Card layout ................................................................................... 1-3
1.4 System requirements ................................................................... 1-3
1.5 Card installation ........................................................................... 1-4
1.6 i Button installation ...................................................................... 1-8
Chapter 2: RAID conguration
2.1 Setting up RAID ............................................................................ 2-2
2.1.1 RAID denitions .............................................................. 2-2
2.1.2 Installing hard disk drives ................................................ 2-3
2.2 LSI WebBIOS Conguration Utility ............................................. 2-4
2.2.1 Starting the WebBIOS CU............................................... 2-4
2.2.2 WebBIOS CU main screen options ................................. 2-5
2.2.3 Creating a Storage Conguration ................................... 2-7
2.2.4 Viewing and Changing Device Properties ..................... 2-31
2.2.5 Viewing System Event Information ............................... 2-36
2.2.6 Managing Congurations .............................................. 2-37
2.3 MegaRAID Storage Manager ..................................................... 2-42
2.3.1 Hardware and Software Requirements ......................... 2-42
2.3.2 Installing MegaRAID Storage Manager Sofware on
Microsoft Windows OS .................................................. 2-42
2.3.3 Installing MegaRAID Storage Manager Sofware for
Linux ............................................................................. 2-46
2.3.4 Linux Error Messages ................................................... 2-47
2.3.5 Starting MegaRAID Storage Manager Software ........... 2-48
2.3.6 MegaRAID Storage Manager Window .......................... 2-50
Chapter 3: Driver installation
3.1 RAID driver installation ............................................................... 3-2
3.1.1 Creating a RAID driver disk ............................................ 3-2
3.1.2 Windows® OS .................................................................. 3-4
3.1.3 Red Hat® Enterprise Linux OS ........................................ 3-9
3.1.4 SUSE Linux Enterprise Server OS ................................3-11
iii

About this guide

This user guide contains the information you need when installing and conguring
the server management board.
How this guide is organized
This guide contains the following parts:
Chapter 1: Product introduction
This chapter offers the PIKE 1078 SAS RAID card features and the new technologies it supports.
Chapter 2: RAID conguration
This chapter provides instructions on setting up, creating, and conguring
RAID sets using the available utilities.
Chapter 3: Driver installation
This chapter provides instructions for installing the RAID drivers on different operating systems.
Where to nd more information
Refer to the following sources for additional information and for product and software updates.
1. ASUS websites
The ASUS website provides updated information on ASUS hardware and software products. Refer to the ASUS contact information.
2. Optional documentation
Your product package may include optional documentation, such as warranty
yers, that may have been added by your dealer. These documents are not
part of the standard package.
iv
Conventions used in this guide
To make sure that you perform certain tasks properly, take note of the following symbols used throughout this manual.
DANGER/WARNING: Information to prevent injury to yourself
when trying to complete a task.
CAUTION: Information to prevent damage to the components
when trying to complete a task.
IMPORTANT: Instructions that you MUST follow to complete a
task.
NOTE: Tips and additional information to help you complete a
task.
Typography
Bold text Indicates a menu or an item to select.
Italics
Used to emphasize a word or a phrase.
<Key> Keys enclosed in the less-than and greater-than sign means that you must press the enclosed key.
Example: <Enter> means that you must press the Enter or Return key.
<Key1+Key2+Key3> If you must press two or more keys simultaneously, the key names are linked with a plus sign (+).
Example: <Ctrl+Alt+D>
Command Means that you must type the command exactly as shown,
then supply the required item or value enclosed in brackets.
Example: At the DOS prompt, type the command line: format a:
v
PIKE 1078 specications summary
Controller LSISAS1078
Interface ASUS PIKE interface
Ports 8 ports
Support device SAS and SATA II devices
Data transfer rate SATA II and SAS 3 Gb/s per PHY
RAID level RAID 0 / RAID 1 / RAID 10 / RAID 5 / RAID 50 / RAID 6 /
OS support** Windows® Server 2003 / Server 2008 / XP / Vista
Form factor 6.44 in x 1.57 in (1U compatible)
* Install the i-Button for PIKE 1078 to work properly. ** The exact OS support would base on the OS support list of the motherboard. *** Specications are subject to change without notice.
RAID 60*
Red Hat® Enterprise Linux 3 / 4 / 5 SUSE Linux Enterprise Server 8 / 9 / 10 LSI MegaRAID Storage Manager (MSM) for Windows® / Linux operating systems
vi
This chapter offers the PIKE 1078 SAS RAID card features and the new technologies it supports.
Chapter 1: Product
1
introduction

1.1 Welcome!

Thank you for buying an ASUS® PIKE 1078 SAS RAID card!
The ASUS PIKE 1078 allows you to create RAID 0, RAID 1, RAID 10, RAID 5, RAID 50, RAID 6, and RAID 60 set(s) from SAS hard disk drives connected to the SAS connectors on the motherboard.
Before you start installing the RAID card, check the items in your package with the list below.

1.2 Package contents

Check your package for the following items.
ASUS PIKE 1078 SAS RAID card
MEGARAID KEY i-BUTTON supporting 8 physical devices
4 port SATA to SAS cable x 2
SGPIO cable x 2
Support CD
User guide
If any of the above items is damaged or missing, contact your retailer.
1-2 Chapter 1: Product introduction

1.3 Card layout

The images below show the major components of the RAID card.
3
122
1
3
122
(Outer heatsink removed, for 1U server)
1. ASUS PIKE interface-1: PCI-E x8
2. ASUS PIKE interface-2: 8-port SAS signal with SGPIO interface*
3. SAS RAID card status LED (lights up and blinks to indicate that the card is working normally)
* The SGPIO interface is used for visibility into drive activity, failure and rebuild
status, so that users could build high-performatnce and reliable storage systems. Refer to the motherboard manual for detailed information about using the SGPIO connectors on the motherboard.
1

1.4 System requirements

Before you install the PIKE 1078 SAS RAID card, check if the system meets the following requirements:
Workstation or server motherboard with a PIKE RAID card slot
SAS or SATA hard disk drives
Supporting operating system:
Windows® and Linux operating systems (refer to website for details)
Other requirement:
- Appropriate thermal solution
- Certied power supply module
ASUS PIKE 1078 1-3

1.5 Card installation

Follow the below instructions to install the RAID card on your motherboard.
Please do remember to install i-button and set IBTN RAID setting jumper (usually named ITBN_SEL1) to [PIKE RAID5] after installing PIKE card. Refer
to the motherboard’s manual for details.
For 2U, 5U, or pedestal server
To install ASUS PIKE 1078 SAS RAID card on a 2U, 5U, or pedestal server
1. Locate the PIKE RAID card slot on the motherboard.
2. Align the golden ngers of the RAID
card with the PIKE RAID card slot.
3. Insert the RAID card into the PIKE RAID card slot. Make sure the card is completely inserted into the card slot, and the heatsink latch is completely hooked to the edge of the card slot.
1-4 Chapter 1: Product introduction
4. Secure the heatsink to the nearest screw hole on the motherboard.
DO NOT overtighten the screw, or the motherboard component can be damaged.
5. Connect the SAS hard disk drives to the SAS connectors on the motherboard.
To uninstall ASUS PIKE 1078 SAS RAID card from a 2U, 5U, or pedestal server
1. Disconnect all SAS hard disk drives from the motherboard.
2. Remove the screw that secures the RAID card to the motherboard.
3. Release the heatsink latch from
the card slot with a nger, and then
remove the RAID card from the slot.
ASUS PIKE 1078 1-5
For 1U server
You have to remove the outer heatsink of ASUS PIKE 1078 SAS RAID card to install the card in a 1U server.
To install ASUS PIKE 1078 SAS RAID card on a 1U server
1. Remove the two screws that secure the heatsink bracket on the back of the SAS RAID card.
Heatsink bracket
2. Remove the two screws that secure the outer heatsink on the front of the SAS RAID card.
DO NOT remove the inner heatsink from the SAS RAID card.
3. Locate the PIKE RAID card slot on the motherboard.
1-6 Chapter 1: Product introduction
4. Align the golden ngers of the
RAID card with the PIKE RAID card slot.
5. Insert the RAID card into the PIKE RAID card slot. Make sure the card is completely inserted into the card slot.
6. Connect the SAS hard disk drives to the SAS connectors on the motherboard.
ASUS PIKE 1078 1-7

1.6 i Button installation

Follow the steps below to install an optional i Button on your motherboard.
1. Locate the I Button slot on the motherboard.
2. Snap the I Button in place.
1-8 Chapter 1: Product introduction
This chapter provides instructions on setting
up, creating, and conguring RAID sets using
the available utilities.
Chapter 2: RAID
conguration
2

2.1 Setting up RAID

The RAID card supports RAID 0, RAID 1, RAID 10, RAID 5, RAID 50, RAID 6, and RAID 60 set(s).
2.1.1 RAID denitions
RAID 0
(Data striping)
data in parallel, interleaved stacks. Two hard disks perform the same work as a single drive but at a sustained data transfer rate, double that of a single disk alone, thus improving data access and storage. Use of at least two new identical hard disk drives is required for this setup.
RAID 1
(Data mirroring)
drive to a second drive. If one drive fails, the disk array management software directs all applications to the surviving drive as it contains a complete copy of
the data in the other drive. This RAID conguration provides data protection and
increases fault tolerance to the entire system. Use two new drives or use an existing drive and a new drive for this setup. The new drive must be of the same
size or larger than the existing drive.
RAID 10 is a striped conguration with RAID 1 segments whose segments are RAID 1 arrays. This conguration has the same fault tolerance as RAID 1, and
has the same overhead for fault-tolerance as mirroring alone. RAID 10 achieves high input/output rates by striping RAID 1 segments. In some instances, a RAID
10 conguration can sustain multiple simultaneous drive failure. A minimum of four
hard disk drives is required for this setup.
RAID 5 stripes both data and parity information across three or more hard
disk drives. Among the advantages of RAID 5 conguration include better
HDD performance, fault tolerance, and higher storage capacity. The RAID
5 conguration is best suited for transaction processing, relational database
applications, enterprise resource planning, and other business systems. Use a minimum of three identical hard disk drives for this setup.
RAID 50 is a combination of RAID 0 and RAID 5. It uses distributed parity and disk striping and works best with data that requires high reliability, high request rates, high data transfers, and medium-to-large capacity.
optimizes two identical hard disk drives to read and write
copies and maintains an identical image of data from one
Having RAID 0 and RAID 5 virtual disks in the same physical array is not recommended. If a drive in the physical array has to be rebuilt, the RAID 0 virtual disk will cause a failure during the rebuild.
RAID 6 stripes dual parity to provide fault tolerance from two drive failures; array
continues to operate with up to two failed drives. This makes larger RAID groups more practical, especially for high availability systems. With dual parity, RAID 6 gives time to rebuild the array without the data being volatile while the failed drive is being recovered.
2-2 Chapter 2: RAID conguration
RAID 60 is a combination of RAID 0 and RAID 6. It uses distributed parity, with two independent parity blocks per stripe in each RAID set, and disk striping. A RAID 60 virtual disk can survive the loss of two disks in each of the RAID 6 sets without losing data. It works best with data that requires high reliability, high request rates, high data transfers, and medium-to-large capacity.
If you want to boot the system from a hard disk drive included in a created RAID
set, copy rst the RAID driver from the support CD to a oppy disk before you
install an operating system to the selected hard disk drive.

2.1.2 Installing hard disk drives

The RAID card supports SAS for RAID set conguration. For optimal performance,
install identical drives of the same model and capacity when creating a disk array.
To install SAS hard disks for RAID conguration:
1. Install the SAS hard disks into the drive bays following the instructions in the system user guide.
2. Connect the SAS port connectors to the SAS drives.
ASUS PIKE 1078 2-3
2.2 LSI WebBIOS Conguration Utility
The LSI WebBIOS Conguration Utility (CU) is an integrated RAID solution that
allows you to create RAID 0, 1, 10, 5, 50, 6, and 60 set(s) from SAS hard disk drives supported by the LSI SAS 1078 controller.
You can also use the WebBIOS CU to do the following tasks:
Create physical arrays and virtual disks for storage congurations
Delete virtual disks
Migrate a storage conguration to a different RAID level
Detect conguration mismatches
Import a foreign conguration
Display adapter, virtual disk, and physical drive properties.
Scan devices connected to the controller
Initialize virtual disks
Check congurations for data consistency
PIKE 1078 does not support the Battery Backup Unit (BBU) function.
You may use disks of different sizes; however, the size of the smallest disk determines the “logical” size of each member disk.
DO NOT combine Serial ATA and SAS disk drives in one volume.
The RAID setup screens shown in this section are for reference only and may not exactly match the items on your screen due to the controller version difference.

2.2.1 Starting the WebBIOS CU

Follow these steps to start the WebBIOS CU and access the main screen.
1. Turn on the system after installing all SAS hard disk drives.
2. During POST, press <Ctrl+H> when the following text appears on the screen:
The Adapter Selection screen appears.
Press <Ctrl+Y> for Preboot CLI: this option is for advanced debug only!
LSI MegaRAID SAS-MFI BIOS Version NT16 (Build Nov 20, 2007) Copyright(C) 2007 LSI Corporation HA -0 (Bus 2 Dev 0) MegaRAID SAS PCI Express(TM) ROMB FW package: 8.0.1-0029
Battery Status: Not present SLOT ID LUN VENDOR PRODUCT REVISION CAPACITY
---- -- --- ------ ------- -------- -------­ 6 LSI MegaRAID SAS PCI Express(1.12.122-0393256MB 6 0 0 ATA Hitachi HDS72161 AB3A 157066MB 6 2 0 ATA Hitachi HDS72161 AB3A 157066MB 6 3 0 ATA Hitachi HDS72161 AB3A 157066MB 6 4 0 ATA Hitachi HDS72107 A70M 715404MB 6 5 0 ATA Hitachi HDS72107 A70M 715404MB 6 6 0 ATA Hitachi HDS72107 A70M 715404MB 0 Virtual Drive(s) found on the host adapter. 0 Virtual Drive(s) handled by BIOS Press <Ctrl><H> for WebBIOS or press <Ctrl><Y> for Preboot CLI
2-4 Chapter 2: RAID conguration
3. If the system has multiple SAS adapters, select an adapter.
4. Click Start to continue. The main WebBIOS CU screen appears.

2.2.2 WebBIOS CU main screen options

This is the Logical View screen, which displays in the lower right panel all virtual
disks (virtual drives) that are congured on this controller. It also shows in the
upper right panel the physical drives that are connected to the controller. To toggle between the physical view and logical view of the storage devices connected to the controller, click Physical View or Logical View in the menu on the left. When the Physical View screen is displayed, the lower right panel displays the arrays that
are congured on this controller.
WebBIOS CU Toolbar Icons
Icon Description
Click this icon to return to the main screen from any other WebBIOS CU screen.
Click this icon to return to the previous screen that you were viewing.
Click this icon to exit the WebBIOS CU program.
Click this icon to display the Adapter Selection screen. If the computer system has multiple adapters, you use this screen to view the devices connected to a different controller.
Click this icon to turn off the sound on the onboard controller alarm.
Click this icon to display information about the WebBIOS CU version, browser version, and HTML interface engine.
ASUS PIKE 1078 2-5
Here is a description of the options listed on the left of the main WebBIOS CU screen:
Adapter Properties: Select this to view the properties of the currently selected
SAS adapter.
Scan Devices: Select this to have the WebBIOS CU re-scan the physical and
virtual disks for any changes in the drive status or the physical conguration.
The WebBIOS CU displays the results of the scan in the physical and virtual disk descriptions.
Virtual Disks: Select this to view the Virtual Disks screen, where you can
change and view virtual disk properties, delete virtual disks, initialize disks, and
perform other tasks.
Physical Drives: Select this to view the Physical Drives screen, where you
can view physical drive properties, create hot spares, and perform other tasks.
Conguration Wizard: Select this to start the Conguration Wizard and create
a new storage conguration, clear a conguration, or add a conguration.
Adapter Selection: Select this to view the Adapter Selection screen, where
you can select a different SAS adapter. You can then view information about
the adapter and the devices connected to it, or create a new conguration on
the adapter.
Physical View/Logical View: Select this to toggle between the Physical View
and Logical View screens.
Events: Select this to view system events in the Event Information screen.
Exit: Select this to exit the WebBIOS CU and continue with system boot.
2-6 Chapter 2: RAID conguration
2.2.3 Creating a Storage Conguration
This section explains how to use the WebBIOS CU Conguration Wizard to congure RAID arrays and virtual disks.
Selecting the Conguration with the Conguration Wizard
Follow these steps to start the Conguration Wizard, and select a conguration
option and mode:
1. Click Conguration Wizard on
the WebBIOS main screen. The
rst Conguration Wizard screen
appears, as shown in the right
gure.
2. Select a conguration option.
If you choose the rst or second option, all existing data in the conguration will
be deleted. Make a backup of any data that you want to keep before choosing these options.
Clear Conguration: Clears the existing conguration.
New Conguration: Clears the existing conguration and lets you
create a new conguration.
Add Conguration: Retains the existing storage conguration and adds
new drives to it (this does not cause any data loss).
3. Click Next. A dialog box warns that you will lose data if you select Clear
Conguration or New Conguration.
4. On the next screen, select a conguration mode:
Custom Conguration: Allows you to control all attributes of the new
storage conguration.
Auto Conguration with Redundancy: Automatically creates an
optimal RAID 1 or RAID 5 conguration, providing data redundancy. We recommends that you select this option.
Auto Conguration without Redundancy: Automatically creates a
non-redundant RAID 0 conguration.
5. Click Next to continue.
ASUS PIKE 1078 2-7
Using Auto Conguration
Follow these instructions to create a conguration with auto conguration, either
with or without redundancy:
1. When WebBIOS displays the proposed new conguration, review the
information on the screen, and click Accept to accept it. (Or click Back to go
back and change the conguration.)
RAID 0: If you selected Auto Conguration without Redundancy,
WebBIOS creates a RAID 0 conguration.
RAID 1: If you selected Auto Conguration with Redundancy,
WebBIOS creates a RAID 1 conguration if only two disk drives are available.
RAID 5: If you selected Auto Conguration with Redundancy,
WebBIOS creates a RAID 5 conguration if three or more disk drives are available.
2. Click Yes when you are prompted to save the conguration.
3. Click Yes when you are prompted to initialize the new virtual disk(s).
WebBIOS CU begins a background initialization of the virtual disks.
Using Custom Conguration: RAID 0
RAID 0 provides disk striping across all drives in the RAID array. RAID 0 does not provide any data redundancy but does offer the best performance of any RAID level. RAID 0 is ideal for applications that require high bandwidth but do not require fault tolerance. RAID 0 also denotes an independent or single drive.
RAID level 0 is not fault-tolerant. If a drive in a RAID 0 array fails, the whole virtual disk (all physical drives associated with the virtual disk) fails.
When you select Custom Conguration and click Next, the Disk Group Denition screen appears. You use this screen to select physical drives to create disk groups (arrays).
1. Hold <Ctrl> while selecting two or more ready drives in the Physical Drives window on the left until you have selected all desired physical drives for the disk group.
2. Click Accept DG to move the drives to a proposed disk group
conguration in the Disk Groups
window on the right, as shown in
the right gure.
If you need to undo the changes, click the Back button.
2-8 Chapter 2: RAID conguration
3. When you have nished selecting
physical disks for the disk groups, click Next.
The span denition screen appears
Select one of the available disk groups, and then click Add to Span.
4. When nish, click Next. The Virtual
Disk Denition screen appears, as shown in the right gure. You use this screen to select the RAID level, strip size, read policy, and other
attributes for the new virtual disks.
5. Change the virtual disk options from the defaults listed on the screen as needed.
Here are brief explanations of the virtual disk options:
RAID Level: The drop-down menu lists the possible RAID levels for the
virtual disk. Select RAID 0.
Strip Size: The strip size species the size of the segment written to
each disk in a RAID conguration. You can set the strip size to 8, 16, 32, 64, 128, 256, 512 or 1024 Kbytes. A larger strip size produces higher
read performance. If your computer regularly performs random read
requests, choose a smaller strip size. The default is 64 Kbytes.
Access Policy: Select the type of data access that is allowed for this
virtual disk:
RW: Allow read/write access. This is the default.
Read Only: Allow read-only access.
Blocked: Do not allow access.
Read Policy: Specify the read policy for this virtual drive:
Normal: This disables the read ahead capability. This is the default.
Ahead: This enables read ahead capability, which allows the controller
to read sequentially ahead of requested data and to store the additional data in cache memory, anticipating that the data will be needed soon. This speeds up reads for sequential data, but there is little improvement when accessing random data.
Adaptive: When Adaptive read ahead is selected, the controller
begins using read ahead if the two most recent disk accesses occurred in sequential sectors. If the read requests are random, the controller reverts to Normal (no read ahead).
ASUS PIKE 1078 2-9
Write Policy: Specify the write policy for this virtual drive:
WBack: In Writeback mode the controller sends a data transfer
completion signal to the host when the controller cache has received all the data in a transaction. This setting is recommended in Standard mode.
WThru: In Writethrough mode the controller sends a data transfer
completion signal to the host when the disk subsystem has received all the data in a transaction. This is the default.
Wrthru for BAD BBU: Select WBack for Write Policy and unselect this
item if you want the controller to use Writeback mode but the controller has no BBU or the BBU is bad. If you choose this option, the controller
rmware automatically switches to Writethrough mode if it detects a bad
or missing BBU.
IO Policy: The IO Policy applies to reads on a specic virtual disk. It
does not affect the read ahead cache.
Direct: In direct I/O mode, reads are not buffered in cache memory.
Data is transferred to the cache and the host concurrently. If the same data block is read again, it comes from cache memory. This is the default.
Cached: In cached I/O mode, all reads are buffered in cache memory.
Disk Cache Policy: Specify the disk cache policy:
Enable: Enable the disk cache.
Disable: Disable the disk cache. This is the default.
NoChange: Leave the current disk cache policy unchanged.
Disable BGI: Specify the background initialization status:
No: Leave background initialization enabled. This means that a
new conguration can be initialized in the background while you use WebBIOS to do other conguration tasks. This is the default.
Yes: Select Yes if you do not want to allow background initializations
for congurations on this controller.
Select Size: Specify the size of the virtual disk in megabytes. Normally,
this would be the full size for RAID 0 shown in the Conguration Panel on the right. You may specify a smaller size if you want to create other
virtual disks on the same disk group.
6. Click Accept to accept the changes to the virtual disk denition, or click Back
to return to the previous settings.
7. Click Next when you are nished dening virtual disks. The conguration
preview screen appears, as shown in the following gure.
2-10 Chapter 2: RAID conguration
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