HP EliteBook 8770w Manuel utilisateur

RAID

User Guide

Development Company, L.P.

Intel is a trademark of Intel Corporation in

the U.S. and other countries. Microsoft,

Windows, and Windows Vista are U.S.

registered trademarks of Microsoft

Corporation.

The information contained herein is subject

to change without notice. The only

warranties for HP products and services are

set forth in the express warranty statements

accompanying such products and services.

Nothing herein should be construed as

constituting an additional warranty. HP shall

not be liable for technical or editorial errors

or omissions contained herein.

First Edition: May 2011

Second Edition: March 2012

Document Part Number: 651196-002

Product notice

This user guide describes features that are

common to most models. Some features

may not be available on your computer.

Table of contents

1 Introduction ..................................................................................................................................................... 1

2 RAID technology overview ............................................................................................................................. 2

RAID terminology ................................................................................................................................. 2

RAID modes supported ........................................................................................................................ 3

3 Operating systems and devices supported ................................................................................................. 7

Operating systems supported .............................................................................................................. 7

Devices supported ................................................................................................................................ 7

4 Intel Rapid Storage Technology .................................................................................................................. 10

Advanced Host Controller Interface ................................................................................................... 10

Intel Rapid Recover Technology ........................................................................................................ 13

5 RAID volume setup ....................................................................................................................................... 14

Enable RAID using the Computer Setup (BIOS) (f10) ....................................................................... 15

Initiate RAID migration ....................................................................................................................... 17

Using Intel Rapid Storage Technology Recovery Console features .................................................. 30

6 Resetting RAID drives to non-RAID ............................................................................................................ 32

7 Frequently asked questions ........................................................................................................................ 34

Can more than one RAID volume be installed on a computer? ......................................................... 34

Is RAID supported to allow both RAID 0 and RAID 1 on a single RAID volume? .............................. 34

Can the computer be undocked if the recovery hard drive is in the docking station SATA-

swappable bay? ................................................................................................................................. 34

Can SRT be enabled in AHCI mode? ................................................................................................ 35

What is the maximum number of hard drives that can be connected to the system during boot

when the storage controller is in RAID mode (f10 Computer Setup)? ............................................... 35

Index ................................................................................................................................................................... 36

iii

1Introduction

Until recently, there were limited options for most computer users who wanted to protect their data

from loss in the event of a hard drive failure. These options were manually copying files to a backup

drive or using cumbersome backup software. If users failed to perform one of these mundane tasks

prior to a hard drive failure, they had to spend considerable time and money to recover even a portion

of the data on the drive. Server and desktop computer users have long enjoyed the security and

benefits of RAID (Redundant Array of Independent Disks) technology to recover data in the event of

drive failure.

HP now offers a simple RAID solution for notebook computer users who need to protect data on a

Serial ATA (SATA) disk drive in case of drive failure or virus attacks. HP’s RAID solution also benefits

computer users who frequently work with large files and want to improve the storage performance of

their computer.

NOTE: The illustrations in this guide are provided in English only.

2 RAID technology overview

This chapter defines the terms used in this guide and describes the RAID technologies supported by

select HP Business computers.

RAID terminology

Some of the terms in the following table have a broader meaning, but they are defined in relation to

the RAID implementation described in this guide.

Term Definition

Fault tolerance The ability of the computer to continue to operate if one drive fails. Fault tolerance is

often used interchangeably with reliability, but the two terms are different.

HDD One physical hard disk drive in the RAID array.

Option ROM A software module inside the system's BIOS that provides extended support for a

particular piece of hardware. The RAID option ROM provides boot support for RAID

volumes as well as a user interface for managing and configuring the system's RAID

volumes.

Primary drive The main internal hard drive in the computer.

RAID array The physical drives that appear as one logical drive to the operating system.

RAID migration The change of data from a non-RAID to RAID configuration. “RAID level migration,” or

the change of data from one RAID level to another, is not supported.

RAID volume A fixed amount of space across a RAID array that appears as a single hard drive to the

operating system.

Recovery drive The hard drive that is the designated mirror (copy of the primary) drive in a RAID 1 and

Recovery volume.

Reliability The likelihood—over a period of time—that a hard drive can be expected to operate

without failure, also known as mean time before failure (MTBF).

Stripe The set of data on a single hard drive in a RAID volume.

Striping The distribution of data over multiple disk drives to improve read/write performance.

SSD (solid-state drive) A solid-state drive is a flash-based or DRAM-based hard drive with no rotating media.

SED (self-encrypting drive) A self-encrypting drive is a hard drive that uses hardware encryption to protect the data

on the drive.

mSATA module An mSATA module is a flash-memory module with an mSATA connector.

2 Chapter 2 RAID technology overview

RAID modes supported

The RAID modes supported by HP Business computers include RAID 0, RAID 1, RAID 5, and

Flexible data protection (Recovery) as described below. RAID modes 0, 1, and Recovery require two

SATA hard drives. RAID mode 5 requires three SATA hard drives. This can be accomplished by

inserting a second SATA hard drive into the Upgrade Bay, eSATA port (if available), or the second

hard drive bay (if available) of the computer, or into the SATA-swappable bay of the HP Advanced

Docking Station (see Devices supported on page 7). RAID 10 is not supported.

NOTE: When the SATA controller is in RAID mode, it will only support up to 4 SATA port devices.

Enabling a fifth SATA port device causes the computer to freeze. Removing the fifth SATA port

device restores normal operation.

RAID 0

RAID 0 stripes, or distributes, data across both drives. This allows data, especially large files, to be

read faster because data is read simultaneously from both drives. However, RAID 0 offers no fault

tolerance, which means that if one drive fails, the entire array fails.

RAID 1

RAID 1 copies, or mirrors, identical data on two hard drives. If one hard drive fails, RAID 1 allows

data to be recovered from the other hard drive.

RAID 5

RAID 5 distributes data across three hard drives. If one hard drive fails, RAID 5 allows data to be

recovered from the other two hard drives.

Flexible data protection (Recovery)

Flexible data protection (Recovery) is a feature of Intel® Rapid Storage Technology software.

Recovery enhances RAID 1 functionality with several features that make it easier for users to mirror

data to a designated recovery drive. For example, Recovery allows users to determine how the

recovery volume is updated, either continuously (the default) or on request. Recovery also enables

docking and undocking of the computer if the second drive is in the docking station's bay.

RAID modes supported 3

RAID mode summary

The following table describes the functions, applications, and advantages and disadvantages of the

supported RAID modes.

RAID levels Function/Applications Advantages/Disadvantages

RAID 0 Function:

Data is distributed across

both disk drives.

Applications:

●Image editing

●Video production

●Pre-press applications

Advantages:

Read performance is

higher than that of a non-

RAID hard drive.

Total storage capacity is

doubled.

Disadvantages:

The entire array fails if one

drive fails; data cannot be

recovered.

Storage space may be

wasted if the capacities of

the primary and recovery

hard drives are different (see

HP SATA drive option kits

on page 7).

RAID 1 Function:

Identical (mirrored) data is

stored on two drives.

Applications:

●Accounting

●Payroll

●Financial

Advantages:

Provides high fault

tolerance.

Disadvantages:

Only half of the total drive

capacity can be used for

storage.

Storage space may be

wasted if the capacities of

the primary and recovery

hard drives are different (see

HP SATA drive option kits

on page 7).

4 Chapter 2 RAID technology overview

RAID levels Function/Applications Advantages/Disadvantages

RAID Recovery Function:

Identical (mirrored) data is

stored on two drives.

Boosts the functionality of

RAID 1 with valuable

features.

Applications:

Any application that requires

a simple data protection

method.

Advantages:

Provides high fault

tolerance.

Users can choose to mirror

data continuously or on

request.

Data recovery is quick and

easy.

Allows hot-plugging of

mirrored drive (with eSATA

or docking station hard

drive).

Enables easy migration to

non-RAID.

Disadvantages:

Only half of the total drive

capacity can be used for

storage.

Storage space may be

wasted if the capacities of

the primary and recovery

hard drives are different.

RAID 5 Function:

Distributes data across three

hard drives. If one hard drive

fails, RAID 5 allows data to

be recovered from the other

two hard drives.

Applications:

A good choice for large

amounts of critical data.

Advantages:

Data redundancy

Improved performance and

capacity

High fault-tolerance and

read performance

Disadvantages:

During a RAID rebuild after a

hard drive fails, system

performance can be

decreased.

Fault tolerance

Fault tolerance is the ability of a RAID array to withstand and recover from a drive failure. Fault

tolerance is provided by redundancy. Therefore, RAID 0 has no fault tolerance because it does not

copy data to another hard drive. With RAID 1 and Recovery, one drive can fail without causing the

array to fail. With Recovery, however, the restoration of a single file or an entire hard drive is much

simpler than with RAID 1 alone. With RAID 5, one of the three hard drives can fail without causing the

array to fail.

RAID modes supported 5

Performance

Performance is easy to understand, but it is difficult to measure because it involves several factors,

some of which are beyond the scope of this document. Overall storage performance is determined by

write performance and read performance, both of which vary based on the RAID technology selected.

●RAID 0 (striping) improves overall storage performance because data can be written and read

simultaneously across two hard drives.

●Recovery and RAID 1 (mirroring) writes the same data to both hard drives; therefore, write

performance may be slower. However, data can be read from both hard drives, so the read

performance can be higher than that of a single non-RAID hard drive.

●RAID 5 performs at a level between RAID 0 and RAID 1.

6 Chapter 2 RAID technology overview

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