ATTO Technology R30F Manual de usuario

ATTO ExpressRAID

Installation and Operation Manual

Macintosh® OS 8.6 to 9.x

respective holders. No part of this manual may be reproduced in any form or by any means without the

express written permission of ATTO Technology, Inc.

10/2003 Document Control Number: PRMA-0113-000MD

Contents

1 RAID Overview ..................................................................................1

RAID Level 0

RAID Level 1

ATTO Recommendations

2 Installation and Quick Start Instructions ..........................................3

3 ExpressRAID Displays Bus, Device, Volume ...................................5

Device Window

SCSI Bus Information

Scanning busses

Volume Window

4 Using ExpressRAID ............................................................................7

Auto Detection

Unallocated Volume Space

Update the ATTO Driver

Ignoring Auto Detection

Adjust other parameters

5 ExpressRAID Provides Hard Disk Utilities .......................................9

Configure Mode Pages

Erase a Drive

Low-Level Format

Scanning Busses

Spin Drive Down

Spin Drive Up

6 Volume control with ExpressRAID ....................................................10

Create Standard Volume

Re-initializing a Volume

Mount a Volume

Unmount a Volume

Remove a Volume

Update drivers across volumes

Optimize volumes with mode pages

Verify Mirrored Volume

Equalize Mirrored Volume

Separate Mirrored Volume

ATTO Options

ExpressWatch Build in Background (RAID1 only)

7 Benchmarking a Volume ....................................................................13

Test parameters

Reading Benchmark results

8 Configure ExpressPCI Fibre Channel Adapters ..............................15

Safeguard buttons

Configuration parameters

Connection mode options

9 Configuring ExpressPCI SCSI Adapters ...........................................17

Safeguard buttons

Configuration utilities

Adapter configurations

Reconfigure device IDs

SCSI ID configuration options

Adjust other parameters

10 ExpressRAID Provides Driver Information .....................................21

11 FireWire Support ...............................................................................22

12 Error, Alert & Status Messages .......................................................23

Appendix A: Glossary ...........................................................................i

Appendix B: SCSI Host Adapter Selection Guide ...............................iii

Appendix C: Fibre Channel Host Adapter Guide ................................iv

Appendix D: Contact ATTO Technology, Inc. .....................................v

ATTO Technology ExpressRAID for Macintosh

1 RAID Overview

Originally Redundant Array of Inexpensive Disks, now Redundant Array of Independent Drives, RAID is a

storage system using multiple disk drives. ATTO ExpressRAID creates virtual disk arrays on physical drives to

increase capacity and performance.

RAID (Redundant Array of Independent Disks) is a

storage system using multiple disk drives to increase

capacity and performance.

Large amounts of data can be supported over many

smaller drives when the drives are combined into one

large “virtual” drive. Management is easier because,

instead of several drives to consider when deploying

data as in a JBOD (Just a Bunch of Disks)

configuration, the system only has one address or LUN

on a storage bus or network.

RAID overlaps disk seeks, minimizing aggregate seek

time delays for the storage group as a whole. Data are

written in equal, short operations to each member of

the RAID group in turn so that when the first member

of a group begins writing to disk, the second member

is available to take data. This continues until the last

member of a group is writing to disk, and the first

member of a group is ready for data.

RAID also takes advantage of the Macintosh® OS

ability to create partitions and volumes.

❖

A logical partition is a separate portion of a

disk space used to allow multiple storage

volumes to coexist on a single disk drive.

❖

A volume is a quantity of storage composed

of one or more partitions residing on one or

more physical drives. A standard volume

creates a partition on a single drive.

RAID Level 0

RAID Level 0 is commonly used when performance is

more important than data protection. RAID Level 0, or

striping, achieves higher I/O performance by breaking

data into smaller units (volumes), then writing the data

to separate physical drives. These striped volumes can

then be read from the separate, physical drives, and re-

assembled into the actual data. You must have at least

two physical drives to create a striped volume. You

should strictly follow a backup policy to protect data

stored on RAID 0 volumes.

RAID Level 1

Disk RAID Level 1 (mirroring) ensures the security of

data by writing data simultaneously to two or more

drives. This application is for users with critical data,

which cannot be lost or corrupted due to the failure of

a single drive. With mirroring, users are protected from

loss of data because Data are stored in two or more

places. If a drive does fail, valuable data will not be

lost.

ATTO Recommendations

❖

Although RAID 0 volumes can be created

among different types and models of drives,

use similar types/models to ensure access

time will be equal to the average access time

of a single drive rather than the access time

of the slowest drive.

❖

For maximum performance, use a dual

channel host adapter with drives equally

distributed across busses.

❖

Use RAID 0 in environments that demand

high I/O rates such as video production and

editing, image editing and prepress.

❖

Since RAID 0 does not provide fault

tolerance, establish a backup policy to

protect data stored on RAID 0 volumes.

❖

ATTO ExpressRAID is designed to work

with any SCSI Manager 4.3 compatible

SCSI bus, but it has been optimized for use

with ATTO ExpressPCI SCSI-3 and Fibre

Channel host adapters.

❖

For the absolute highest performance using

SCSI, connect each of the drives to be

striped to a separate ATTO ExpressPCI

SCSI-3 host adapter. Multiple host adapters

increase performance by allowing data to be

transferred to all striped drives

simultaneously.

RAID overview

Exhibit 1-1 A graphical representation of data storage in RAID configurations.

◗

Each cylinder represents a

separate physical drive.

◗

Each physical drive has been

divided into partitions, labeled

logical partition (LP)

◗

Physical Drive 4 has been

initialized and is empty with no

partitions or data. This volume

can be used to create either a

standard or a striped volume.

◗

LP7 and LP11 are free

partitions that can be used to

create standard or striped

volumes.

◗

Data has been striped (RAID

Level 0) across physical drives

1, 2 and 3, using partitions

LP1, LP 2 and LP3, named Volume 1. LP4, LP5 and

LP6 are also examples of striping data across three

separate physical drives into Volume 2.

◗

LP8 is a standard volume using one partition.

◗

LP9, LP 10, LP12, LP 13 and LP14 are also standard

volumes.

Note: If you create a striped volume across multiple

physical drives and the partitions are not the same

size, you will only be able to use the portion of each

partition equal to the size of the smallest partition,

leaving unused and inaccessible space on the larger

partitions in the volume.

ATTO Technology ExpressRAID for Macintosh

2 Installation and Quick Start Instructions

To install ATTO ExpressRAID, put the ExpressRAID CD in the CD-ROM player, double click on the

program icon, then the installer icon. Drag the ExpressRAID icon to the hard drive and open the

program. To ensure complete installation and ease of use, take a few minutes to read this manual before

attempting installation.

To successfully install and use ATTO ExpressRAID

you need:

❖

A Macintosh compatible computer with SCSI

Manager 4.3

❖

Macintosh Operating System 7.5.2 to 9.x. This

version of ATTO ExpressRAID currently does

not support Mac OS X.

❖

Two or more hard drives (SCSI or Fibre

Channel)

❖

The ExpressRAID CD including ExpressRAID

and ExpressWatch (required if you are creating

volumes without Auto Detection.)

To install ATTO ExpressRAID

1 Insert the ATTO ExpressRAID CD.

2 Double click on the ExpressRAID disk icon.

3 Double click the ATTO ExpressRAID

Installer.

4 Drag the ATTO ExpressRAID icon to the

drive where you want to install

ExpressRAID.

5 A screen will ask if you want to install

ExpressWatch. Choose Ye s if you plan to

create a volume without Auto Detection.

Note: Refer to Chapter 4 for the benefits of

using the Auto Detection feature.

6 Click Quit.

To create a volume with Auto Detection

1 Double click the ATTO ExpressRAID icon.

2 If new or unused drives are present, Auto

Detection prompts you select one of the

following

Create a Standard Volume

Create a RAID Level 0 Volume

Create A RAID Level 1 Volume

Nothing

To create a standard volume

2a Click Create Standard Volume.

2b Set volume parameters. ATTO

ExpressRAID automatically creates

partitions based on the parameters you set

2c Click OK.

To create a RAID 0 volume

2a Click Create RAID 0 Volume.

2b Set volume parameters. ATTO

ExpressRAID automatically creates

partitions based on the parameters you set

2c Click OK.

To create a RAID 1 volume:

2a ExpressWatch must be enabled/active

to build a volume in the background.

Note:Building a RAID group in the

background takes longer than in foreground,

especially when larger volumes are made.

2b Click the Mirror button.

2c Create Mirror Volume window appears.

Select necessary options.

2d Click OK.

2e Quit ExpressRAID while volumes are

continuing to be built in the background.

Background equalization will continue until

complete.

Note: If you try to shut down the system while

building a volume in background, a screen

will warn that ExpressWatch will have to

reequalize drives upon startup.

To create a volume without Auto Detection

1 Double click the ATTO ExpressRAID Icon.

2 At the main screen, select one of the

following

Create a Standard Volume

Create a RAID Level 0 Volume

Create A RAID Level 1 Volume

Nothing

Installation, quick start

Create a RAID 0 volume

2a Click Create RAID 0 Volume.

2b Select drives you wish to include in the

RAID volume. To select multiple drives hold

the Shift key and click on the drives.

2c Set volume parameters. ATTO

ExpressRAID automatically creates

partitions based on the parameters you set.

2d Click OK.

Create a RAID 1 volume

2a ExpressWatch must be enabled/active

to build a volume in the background.

Note: Building a RAID group in the

background takes longer than in foreground,

especially when larger volumes are made.

2b Select multiple drives by holding the

Shift key and clicking on the drives to be

mirrored.

2c Click the Mirror button.

2d Create Mirror Volume window appears.

Select necessary options.

2e Click OK.

2f Quit ExpressRAID while volumes are

continuing to be built in the background.

Background equalization will continue until

complete.

Note: If you try to shut down the system while

building a volume in background, a screen

will warn that ExpressWatch will have to re

equalize drives upon start-up.

Create a RAID 1 volume with data on an

existing drive

1 Select the volume. The mirror button will

become available.

2 Click the Mirror button.

3 A list of available drives appears.

4 Select 1 or more drives to mirror data on.

5 Click OK.

6Create Mirror Volume window appears.

Volumes will be listed as mirrored when the

process completes.

Note: Mirroring an existing drive can be done

in either the foreground or background.

ATTO Technology ExpressRAID for Macintosh

3 ExpressRAID Displays Bus, Device, Volume

The ATTO ExpressRAID Device Window displays busses, IDs and devices. The Volumes window

displays information about the volumes available.

The amount of information shown in the device

and volume windows depends on the settings. An

information button next to any item in either

window provides more information about that

item. Clicking on a device in the device window

highlights the associated volumes in the volume

window, and vice versa. Other choices may be

presented after clicking on certain items in either

window.

Device Window

On the left side of the ExpressRAID main window

is the device window. This window displays SCSI

and Fibre Channel busses, IDs and devices. Next

to each item is an information button. Clicking on

a device in the device window highlights the

associated volumes in the volume window. The

amount of information shown depends on the

setting chosen in the device window menu.

Device Window Menu

The device window menu,

above the device window, presents three options.

❖

Busses and Drives:

Displays all SCSI and

Fibre Channel busses and hard drives

attached to them. Other devices which

ExpressRAID does not affect, such as CD-

ROM drives, tape drives and scanners, are

not shown in the device window when this

is selected.

❖

Busses and Devices:

displays all SCSI and

Fibre Channel busses and devices attached to

them. This setting is useful for determining

what devices are attached to your computer

and what IDs are available for additional

devices.

❖

Busses and All IDs

Displays all SCSI and

Fibre Channel busses and all IDs, whether a

device is at that ID or not. This option is most

useful when configuring individual IDs using the

ExpressPCI Configuration Options.

SCSI Bus Information

SCSI bus information is displayed in bold type.

Clicking on the triangle to the left displays or

hides a SCSI ID and the devices attached to it. The

information displayed includes the bus number,

bus manufacturer and the version number of the

bus, if available. Double click on a bus or click on

its information button to reveal more information

about that bus, including the bus version, width

and transfer speed. If the bus is an ATTO bus,

additional parameters are accessible.

ExpressPCI 3300/3305 models also have a

Data

Rate

field. Autonegotiate is the default. Choices

are autonegotiate, 1-gigabit or 2-gigabit.

Because of the way Fibre Channel and SCSI

translate IDs, a single Fibre Channel host adapter

will appear in the device window as eight separate

busses, allowing the ATTO ExpressPCI FC host

adapter to support the 126 IDs available in Fibre

Channel. There is really only a single host adapter

or bus, not eight. Changes made to any one of the

eight apparent busses will be made to the other

seven busses.

SCSI device ID information

❖

SCSI address of the device, where X is the

bus number, Y is the SCSI ID Number and

Z is the Logical Unit Number.

❖

Type of device at the address

❖

Device manufacturer

❖

Amount of drive space available to create

new volumes. A completely initialized

drive appears as having 0.0 MB free.

❖

Double click on a SCSI ID or click on its

information button for more information

on the device ID, including drive vendor,

model number, capacity and partition

information. If the ID is on an ATTO bus,

additional parameters are accessible

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