Adaptec 2920C - AHA - Storage Controller Manuale utente

Introduction

The AHA®-2920C host adapter provides a powerful multitasking

interface between your computer’s PCI bus and SCSI devices (disk

drives, CD-ROM drives, scanners, tape drives, removable-media

drives, etc.). You can connect up to seven 8-bit SCSI devices to your

host adapter. The following figure shows the major components of the

AHA-2920C host adapter

The AHA-2920C host adapter provides a powerful multitasking

interface between your computer’s PCI bus and internal and external

SCSI devices (disk drives, CD-ROM drives, tape drives, removable-

media drives, etc.). The host adapter supports SCSI Configured

AutoMatically (SCAM), which automatically assigns SCSI IDs to

SCAM compatible devices. The figure below identifies the major com-

ponents of the AHA-2920C host adapter.

With the Adaptec software drivers, you can use AHA-2920C host

adapters in computers running DOS/Windows®, OS/2,

Windows®95, Windows NT™, UNIX, and NetWare.

50-pin Internal SCSI Connector

SCSI Terminator Chips External LED

Connector

EEPROM

BIOS

40 Mhz Clock

Crystal

SCSI Chip

50-pin High-Density External

SCSI-2 Connector

Contents

Installation

Installing the Host Adapter . . . . .2

Installing Internal SCSI Devices .3

Installing External SCSI Devices .4

Installing Software . . . . . . . . . . . .5

Helpful Hints

Configuring SCSI Devices . . . . . .5

Configuring Disk Drives . . . . . . .6

Installing Multiple Adapters . . . .6

Using SCSISelect . . . . . . . . . . . . . .6

Troubleshooting Checklist . . . . .10

Common Problems and

Solutions . . . . . . . . . . . . . . . . . . 11

Installation

Installing the Host Adapter

WARNING:

Before beginning the installation,

turn OFF power to the computer and external

devices and disconnect the power cords.

Step 1:

Remove the cover from the computer case. (If

necessary, refer to your computer documentation.)

Step 2:

Locate an unused PCI expansion slot. (This slot

is typically white or ivory.) Unscrew the expansion slot

bracket that covers the card-slot opening.

The PCI slot must support bus master data transfers

(refer to your computer documentation or contact your

vendor).

Step 3:

Insert the host adapter in the PCI expansion

slot. Press it down firmly so that the contacts are securely

seated in the slot, and secure it with the screw that you

removed in step 2.

Step 4:

OPTIONAL-Connect the host adapter to the

LED on the computer so that it will light whenever there

is activity on the SCSI bus. To do this disconnect the LED

cable from the LED connector on the motherboard and

connect it to the LED connector on the host adapter.

Step 5:

Make sure that all SCSI devices have unique

SCSI ID’s from 0 to 6. (Refer to your device

documentation for SCSI ID settings and instructions on

manually changing the default settings.)

Back of

Your Computer

PCI expansion slots

(typically white or ivory)

16-bit ISA expansion slot

(typically black)

Expansion slot bracket

screw

Bus contacts

PCI expansion slot

(typically white or ivory)

Pin 1

LED cable

from motherboard

LED connector

onadapter

2-pin LED

cable

If you are installing external SCSI devices only, replace

the computer chassis cover and skip to Installing External

SCSI Devices on page 4.

Installing Internal SCSI Devices

Step 1:

Install or enable terminators on the internal

SCSI device that you plan to connect to the end of the

internal cable. Then remove or disable terminators on all

other internal devices.

On most internal SCSI devices, you control termination

by setting a jumper or a switch, or by physically remov-

ing or installing a resistor module(s). Refer to the

device’s documentation to determine how to enable or

disable termination on your particular device.

Step 2:

Install and mount each internal SCSI device

inside your computer. (Refer to your computer and

device documentation for instructions.)

If you purchased your AHA-2920C as part of an Adaptec

kit, the kit includes one 50-pin internal SCSI cable that

allows you to connect up to two internal SCSI devices.

Step 3:

Plug one end of your 50-pin internal SCSI cable

into the host adapter’s internal SCSI connector. To

connect more than two internal devices, you will need to

obtain or purchase a SCSI cable with enough connectors

to accommodate all of your devices.

Make sure that the colored stripe on one side of the cable

is aligned with pin-1 of the host adapter’s connector.

Pin-1 of the connector is usually designated by a small

triangle (▲), or a “1” on the connector.

Step 4:

Plug the other end of the 50-pin internal SCSI

cable into the connector on the last internal SCSI device

in the chain. (This device must be terminated.) Make sure

the colored stripe on the side of the cable is aligned with

pin-1 of the SCSI device’s connector.

Step 5:

Plug the remaining cable connectors into any

remaining internal devices. (These devices must not be

terminated.)

Termination

Enabled

Termination

Disabled

Colored stripe

(typically red or blue)

Intenal SCSI

connector

50-pin SCSI

ribbon cable

Internal SCSI

device

Pin 1

Colored stripe

(typically red or blue)

Step 6:

Connect a DC power cable from your

computer’s power supply to the power connector on the

SCSI device.

Step 7:

Replace the computer chassis cover.

Installing External SCSI Devices

Step 1:

Plug one end of a 50-pin high-density external

SCSI cable into the host adapter’s external SCSI

connector. Plug the other end of the external SCSI cable

into one of the connectors on the external SCSI device. If

you are installing only one external device, enable the

device termination or attach a terminating plug to the

device.

Step 2:

To connect additional external SCSI devices,

daisy-chain each device to the previous device until all

devices are connected to each other. (The device at the

end of the chain must have a terminating plug or have

the on-board terminator enabled.) You need a 50-pin

high-density external SCSI cable to connect external

devices to the host adapter.

Step 3:

Reconnect the power cables to the computer

and external SCSI devices. Turn ON the power to the

external devices first, and then turn ON power to the

computer.

If you plan to boot your computer from a SCSI device

attached to the host adapter such as a hard disk drive,

run the SCSISelect utility, as described in Using

SCSISelect on page 6, and set the Boot Target ID to corre-

spond to the SCSI ID of the boot device.

50-pin SCSI

ribbon cable

DC power cable

(from the power supply)

Terminating Plug

Installing Software

Under MS-DOS 5.0 and above, the AHA-2920C host

adapter can support up to seven SCSI devices without

additional software. (Earlier versions of DOS support up

to two hard disk drives.) You need to install additional

software to support other kinds of SCSI devices such as

tape drives, CD-ROM drives, and scanners.

■If Adaptec EZ-SCSI®was included with your

AHA-2920C, you should install it now. Adaptec

EZ-SCSI provides software driver support for your

host adapter and SCSI devices in computers running

under DOS, Windows®, Windows 95®, and

Windows NT™.

■The Adaptec®7800 Family Manager Set provides

software driver support for the NetWare, OS/2, and

UNIX platforms.

■If you purchased your host adapter from a third-

party vendor, you can use the drivers they provide.

(Refer to the third-party documentation for installa-

tion instructions and troubleshooting information.)

Congratulations!

You have completed the installa-

tion of your host adapter. For additional information on

configuring your host adapter, see Helpful Hints on

page 5.

Helpful Hints

This section contains useful information on configuring

and using your host adapter.

Configuring SCSI Devices

Your host adapter can transfer data on the SCSI bus at a

maximum negotiated transfer rate of 10 MBytes/sec. For

reliable data transfers, the following requirements

should be met:

■Internal and external cables should be terminated

with terminators either provided by the SCSI device

at the end of the cable or by a separate terminating

plug. The terminator on the AHA-2920C is an active

terminator.

■For all SCSI devices connected to the host adapter,

make sure you use high-quality SCSI cables to ensure

reliable data transfer. Select cables labeled “SCSI II”

to ensure cable compliance to the SCSI specification.

Note that cables with a 25-pin DB25 connector may

not meet SCSI II standards. However, if you must use

this cable, restrict the external cabling to a minimum

length (always leave parity checking enabled to ver-

ify reliable data transfers).

When one or more Fast SCSI devices are connected to

the host adapter, the combined length of all cables

(internal and external) should not exceed 3 meters

(9.8 feet) to ensure reliable operation when transfer-

ring data at 10 MBytes/sec.

■Your host adapter can support the SCSI Configured

AutoMatically (SCAM) protocol, which automati-

cally assigns SCSI IDs dynamically and resolves SCSI

ID conflicts at bootup. To enable or disable SCAM

support, see Additional Options: Boot Device Options on

page 8.

If your system includes SCSI disk drives or other

devices that support SCAM and SCAM is enabled,

you do not need to manually assign SCSI IDs to these

devices. Most SCSI devices currently in use, however,

do not support SCAM, and you must set their SCSI

IDs manually.

Configuring Disk Drives

■Every hard disk must be low-level formatted, parti-

tioned, and logically formatted before you can use it

to store data. Most SCSI hard disks are physically for-

matted at the factory and do not need to be formatted

again.

If you connected a new hard disk drive to your host

adapter, you must partition and logically format the

drive. For DOS and Windows (3.x and 95) use the

DOS Fdisk and Format commands (see your com-

puter and DOS documentation). For other operating

systems, see your operating system documentation.

■If you are booting from a SCSI hard disk drive, make

sure the Hard Disk (or Drives) setting in your

computer’s CMOS setup program is set to None or

No Drives Installed, as required for SCSI hard disk

drives. (See your computer documentation.)

If the motherboard has an embedded SCSI controller,

disable the embedded controller after you install the

AHA-2920C.

■If you installed both SCSI and non-SCSI (e.g., IDE)

disk drives, the non-SCSI disk drive is always the

boot device

Installing Multiple Adapters

■You can install multiple SCSI host adapters if unused

I/O ports and BIOS addresses are available.

■Each host adapter you install forms a separate SCSI

bus with a different set of SCSI devices.

SCSI IDs can be reused as long as the ID is assigned

to a device on a different host adapter (for example,

each host adapter can have a device with SCSI ID 0).

■If you have two or more SCSI host adapters, enable

the BIOS only on the host adapter you have selected

as a boot device. Disable the BIOS on the other host

adapter(s).

Using SCSISelect

The SCSISelect configuration utility allows you to change

host adapter settings without opening the computer

case when using the AHA-2920C. SCSISelect also has

SCSI disk utilities that allow you to perform a low-level

format or to verify the disk media of your SCSI hard disk

drives.

Starting the SCSISelect Utility

You can start SCSISelect by pressing Ctrl-A when the fol-

lowing prompt appears briefly at boot time:

Press <Ctrl><A> for SCSISelect (TM) Utility!

The first menu that appears displays two options:

Configure/View Host Adapter Settings and SCSI Disk

Utilities.

Using SCSISelect Menus

SCSISelect uses menus to list selectable options. To select

an option, use the ↑ and ↓ keys to move the cursor to the

option, then press Enter.

When you select an option, another menu may appear.

Return to the previous menu at any time by pressing Esc.

To restore the original SCSISelect default values, press

F6. To toggle the display between color and mono-

chrome modes, press F5 (this feature may not work on

some monitors).

Exiting SCSISelect

To exit SCSISelect press Esc. A message prompts you to

exit (if you changed any host adapter settings, you are

prompted to save the changes before you exit). At the

prompt, select Yes to exit, then press any key to reboot

the computer. Any changes you made in SCSISelect take

effect after the computer reboots.

Using the SCSI Disk Utilities

To access the SCSI disk utilities, select the SCSI Disk

Utilities option from the menu that appears when you

start SCSISelect.

Once the option is selected, SCSISelect immediately scans

the SCSI bus and displays a list of all SCSI IDs and the

devices assigned to each ID. When you select a specific

ID and device, a menu appears, displaying the Format

Disk and Verify Disk Media options.

■Format Disk—This utility allows you to perform a

low-level format on a hard disk drive. Most SCSI disk

devices are preformatted at the factory and do not

need to be formatted again.

The Adaptec Format Disk utility is compatible with

the vast majority of SCSI disk drives.

Caution:

A low-level format destroys all data on

the drive. Be sure to back up your data before

performing this operation. You cannot abort a

low-level format once it is started.

■Verify Disk Media—This utility allows you to scan

the media of a hard disk drive for defects. If the util-

ity finds bad blocks on the media, it prompts you to

reassign them. If you select yes, those blocks are no

longer used. You can press Esc at any time to abort

the utility

■Default Settings—The AHA-2920C has default set-

tings appropriate for most PCI systems (see the table

below). Run SCSISelect only to change these settings.

Definitions of SCSISelect Settings

This section defines the default settings for the host

adapter.

Settings for Host Adapter and All SCSI Devices

The following settings are most likely to require

modification.

■Host Adapter SCSI ID— This option sets the SCSI ID

of the host adapter.

To give the host adapter the highest priority on the

SCSI bus, we recommend that you leave the host

adapter at its default setting of SCSI ID 7.

■SCSI Parity Checking—This option determines

whether the host adapter verifies the accuracy of data

transferred on the SCSI bus. The default setting is

Enabled.

If any SCSI device connected to the host adapter does

not support SCSI parity, disable SCSI Parity Checking

on the host adapter and all SCSI devices. To deter-

mine if a device supports SCSI parity, read the device

documentation.

■Host Adapter SCSI Termination—This option sets

termination on the host adapter. You can set it to

Automatic, Enabled, or Disabled. We recommend that

you leave this option set to its default setting of Auto-

matic. When set to Automatic, the host adapter does

the following:

– If the host adapter detects that cables are con-

nected to either its internal or external SCSI con-

nector, it enables its terminators (the host adapter

is at the end of the SCSI bus).

– If the host adapter detects that a cable is con-

nected to both its internal and external SCSI con-

nectors, it disables its terminators (the host

adapter lies between the ends of the SCSI bus).

SCSI Bus Interface Definitions Default Value

Host Adapter SCSI ID 7

SCSI Parity Checking Enabled

Host Adapter SCSI Termination Automatic

Additional Options: SCSI Device Configuration Default Value

Initiate Sync Negotiation Yes

Maximum Sync Transfer Rate 10 MBytes/sec

Enable Disconnection Yes

Send Start Unit Command No

BIOS Multiple LUN Support No

Include in BIOS SCAN Yes

Additional Options: Boot Device Options Default Value

Boot SCSI ID 0

Boot LUN Number 0

Additional Options: Advanced Configuration Options Default Value

Plug and Play SCAM Support Disabled

Reset SCSIBus at IC Initialization Enabled

Host Adapter BIOS Enabled

Support Removable Disks under BIOS as Fixed Disks Boot Only

Extended BIOS Translation for DOS Drives > 1 GByte Enabled

Display <Ctrl><A> Message During BIOS Initialization Enabled

BIOS Support for Bootable CD-ROM Enabled

BIOS Support for Int 13 Extensions Enabled

Additional Options: SCSI Device Configuration

SCSI device settings allow you to configure parameters

for each device on the SCSI bus. To configure a specific

device, you must identify the SCSI ID assigned to that

device. To determine the SCSI ID of a device, see Using

the SCSI Disk Utilities on page 6.

■Initiate Sync Negotiation — This option determines

whether or not synchronous data transfer negotiation

between the host adapter and a device is initiated by

the host adapter.

The default setting is Yes (Enabled). Set Initiate Sync

Negotiation to No for devices that do not support

Sync Negotiation.

■Maximum Sync Transfer Rate — This option sets the

maximum synchronous data transfer rate that the

host adapter supports. The host adapter supports

transfer rates of up to 10.0 MBytes/sec. If Initiate

Sync Negotiation is set to No, then the maximum syn-

chronous transfer rate is the maximum rate that the

host adapter accepts from the device during

negotiation.

■Enable Disconnection — This option lets a SCSI

device temporarily disconnect from the SCSI bus.

This allows the host adapter to perform other opera-

tions while the SCSI device is disconnected. The

default setting is Yes. Set Enable Disconnection to

Yes if two or more SCSI devices are connected to the

host adapter.

■Send Start Unit Command — This option deter-

mines whether the Start Unit SCSI Command is sent

to the device at bootup (most devices do not require

this). The default setting is No.

■BIOS Multiple LUN Support—This option deter-

mines whether booting from a SCSI device that has

multiple LUNs is supported. The default setting is No

(Disabled). Enable this option if your boot device has

multiple LUNs.

■Include in BIOS SCAN—This option determines

whether or not the AHA-2920C will be included in

the BIOS device scan during power up. The default

setting is Yes.

■Reset SCSIBus at IC Initialization—This option

determines whether or not the SCSI bus will be reset

and placed into an idle state after power up. The

default value is enabled.

Additional Options: Boot Device Options

Boot device options allow you to specify the device from

which to boot your computer.

■Boot SCSI ID—This option specifies the SCSI ID of

the boot device and must correspond to the ID of the

boot device. The default setting is SCSI ID 0.

■Boot LUN Number—This option allows you to spec-

ify which LUN to boot from on your boot device if

the device has multiple LUNs (Logical Unit Num-

bers) and Multiple LUN Support is enabled. The

default setting is LUN 0.

Additional Options: Advanced Configuration Options

Do not change the advanced configuration options

unless absolutely necessary.

■Plug and Play SCAM Support — This option allows

the host adapter to automatically assign SCSI IDs to

SCSI devices that support the SCAM protocol. The

default setting is Disabled. Most non-SCAM devices

tolerate the SCAM protocol, so you can enable this

option even if you have a non-SCAM device.

■Host Adapter BIOS — This option enables or dis-

ables the host adapter BIOS. The default setting is

Enabled. Several SCSISelect options are not valid

unless the host adapter BIOS is enabled.

Make sure that the BIOS is enabled if you want to

boot from a SCSI disk drive connected to the host

adapter. Disable the BIOS if device drivers control the

devices on the SCSI bus and do not require BIOS

functionality.

■Support Removable Disks Under BIOS as Fixed

Disks — This option controls which removable-

media drives are supported by the host adapter BIOS.

The default setting is Boot Only. The following choices

are available:

–Boot Only — Only the removable-media drive

designated as the boot device is treated as a hard

disk drive.

–All Disks — All removable-media drives sup-

ported by the BIOS are treated as hard disk

drives.

–Disabled — No removable-media drives are

treated as hard disk drives. In this situation,

software drivers are needed because the drives

are not controlled by the BIOS.

Caution:

If a removable-media SCSI device is

controlled by the host adapter BIOS as a fixed

disk, do not remove the media while the system

is running; otherwise you may lose the data! If

you need to be able to remove the media while

the drive is on, install a removable-media

device driver and set this option to Disabled.

■Extended BIOS Translation for DOS Drives >

1GByte— This option determines whether extended

translation is available for SCSI hard disks with

capacities greater than 1 GByte.

The default setting is Enabled. Extended BIOS Transla-

tion for DOS Drives> 1 GByte is used only with

MS-DOS 5.0 or above. You do not need to enable this

option if you are using another operating system

such as NetWare, OS/2, Windows NT, or UNIX.

Caution:

If you decide to change the translation

scheme, back up your disk drives first! All data

is erased when you change from one translation

scheme to another.

The standard translation scheme for SCSI host adapt-

ers provides a maximum accessible capacity of

1 GByte. To support disk drives larger than 1 GByte,

the AHA-2920C includes an extended translation

scheme. This scheme, under MS-DOS, supports

2 GByte partitions on disk drives as large as 8 GBytes.

When you partition a disk under BIOS control larger

than 1 GByte, use the MS-DOS

fdisk

utility. Because

the cylinder size increases to 8 MBytes under

extended translation, the partition size you choose

must be a multiple of 8 MBytes. If you request a size

that is not a multiple of 8 MBytes,

fdisk

rounds up to

the nearest whole multiple of 8 MBytes.

■Display <Ctrl-A> Message During BIOS Initializa-

tion — This option determines whether the Press

<Ctrl> <A> for SCSISelect (TM) Utility! message

appears on your screen during system bootup. The

default setting is Enabled. If this setting is disabled,

you can still start SCSISelect by pressing <Ctrl><A>

after the host adapter BIOS banner appears.

■BIOS Support for Bootable CD-ROM — This option

determines whether the host adapter BIOS provides

support for booting from a CD-ROM drive. The

default setting is Enabled.

■BIOS Support for Int 13 Extensions — This option

determines whether the host adapter BIOS supports

disks with more than 1024 cylinders. The default set-

ting is Enabled.

Troubleshooting Checklist

If you have any problems during the installation, check

the following items first:

■Have you installed the host adapter in a PCI Rev 2.0

compliant computer?

■Are all SCSI devices powered?

■Are all SCSI bus cables and power cables properly

connected? Is pin 1 oriented correctly?

■Does the host adapter and each device on the SCSI

bus have a unique SCSI ID?

■Did you install your host adapter in a bus master PCI

slot? Refer to your computer’s documentation for

instructions or try another slot.

■Are the devices at the extreme ends on the SCSI bus

terminated properly?

■Does the total SCSI cable length exceed the 3-meter

limit when the maximum sync transfer rate is set to

10 MBytes/sec?

■Does your system CMOS setup require you to enable

PCI bus parameters? If so, refer to your computer’s

documentation for instructions. Check that IRQ chan-

nel assignment, board, and BIOS settings have been

made.

Some configuration options apply to a specific PCI

bus slot, so if you change these options be sure you

are applying them to the slot in which the host

adapter is installed.

Check your computer documentation to verify which

slot corresponds to which number.

– If there is an Interrupt Type or Interrupt Line

option in the Setup program, be sure to select

Int-A or Interrupt Type = A. Depending on your

system design, you may also be required to

change a motherboard jumper setting.

– If there is a Triggering Interrupt option, be sure to

select Level.

– If there is an option to enable or disable bus mas-

tering for the PCI slots, be sure to select Enabled.

– If there is an option to enable or disable individ-

ual PCI slots, be sure the slot in which you install

the host adapter is Enabled.

– If your computer has a combination of ISA (or

EISA) boards and PCI boards, you may need to

mark the IRQs used by ISA/EISA boards as Used

so the system BIOS will not try to assign these

IRQs to other PCI boards.

– In some systems the BIOS reserves a set of avail-

able IRQs for PCI boards, and you have to assign

these IRQs manually.

■If SCAM is enabled, are your SCSI devices SCAM-

capable or SCAM-tolerant? Devices that are not

SCAM-tolerant may not be detected by the BIOS.

ASPI drivers should not have any problems.

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