Adaptec AHA-2910 Manuale utente

AHA-2910/2910A Installation Guide

Part Number: 510874-00, Rev. A

Print Spec Number: 493882-00

Current Date: 7/6/95 ECN Date: 7/11/95

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AHA-2910/2910A

Plug and Play PCI-to-Fast SCSI Host Adapter

with SCSISelect Utility

Installation Guide

AHA-2910/2910A Installation Guide

Part Number: 510874-00, Rev. A

Print Spec Number: 493882-00

Current Date: 7/6/95 ECN Date: 7/11/95

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Getting Started

This document explains how to install and config-

ure AHA®-2910 and AHA-2910A Plug and Play

PCI-to-Fast SCSI host adapters. The AHA-2910/

2910A is designed for computers with 5-volt bus

mastering PCI (Peripheral Component Interconnect)

slots. The computer in which you install the host

adapter must be PCI Rev 2.0 compliant.

AHA-2910/2910A host adapters are configured

automatically in computers that have a Plug and

Play BIOS and/or a Plug and Play operating system.

These host adapters are also fully functional in non-

Plug and Play computers.

Host Adapter Features

AHA-2910/2910A host adapters provide a powerful

multitasking interface between your computer’s PCI

bus and the installed disk drives, CD-ROM drives,

and other SCSI devices. These host adapters support

the SCAM (SCSI Configured AutoMatically) proto-

col, which assigns SCSI IDs automatically to devices

that recognize SCAM software commands.

Adaptec’s SCSISelect™configuration utility, which

is included with the host adapter, makes it easy to

change the host adapter configuration without open-

ing the computer case or setting switches.

Supported Operating Systems

Adaptec’s software drivers enable you to use

AHA-2910/2910A host adapters in computers run-

ning DOS/Windows, OS/2, Windows 95,

Windows NT, UNIX, and NetWare.

Software Requirements

You must install software drivers in order to use the

AHA-2910/2910A host adapter and to support SCSI

disk drives and other devices. Adaptec EZ-SCSI™

software provides this software support for DOS and

Windows. Adaptec EZ-SCSI also includes DOS and

Windows utilities and applications that allow you to

get the most use out of your SCSI devices. For more

information about EZ-SCSI software, call Adaptec.

AHA-2910/2910A Installation Guide

Part Number: 510874-00, Rev. A

Print Spec Number: 493882-00

Current Date: 7/6/95 ECN Date: 7/11/95

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Host Adapter Layout

The following diagrams show the main components

of the AHA-2910 and the AHA-2910A:

Note: AHA-2910i and AHA-2910Ai host

adapters support only internal SCSI devices

and therefore have no external SCSI

connector.

50-pin Internal

SCSI Connector

50-pin High Density

External SCSI

Connector

Multiple Computer

Termination Jumper

External LED

Connector

AHA-2910

50-pin Internal

SCSI Connector

50-pin High Density

External SCSI

Connector

Multiple Computer

Termination Jumper

External LED

Connector

AHA-2910A

AHA-2910/2910A Installation Guide

Part Number: 510874-00, Rev. A

Print Spec Number: 493882-00

Current Date: 7/6/95 ECN Date: 7/11/95

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Installing the Host Adapter

WARNING: Turn OFF and disconnect the

power to your computer and peripheral

devices before you begin installation.

1Remove the computer chassis cover to expose the

expansion slots and external access covers.

2Locate an unused, unobstructed PCI bus expan-

sion slot that supports bus mastering. (PCI bus

slots are usually white or ivory.) See your com-

puter documentation to determine if the PCI slot

supports bus mastering.

Many PCI computers have one pair of ISA and

PCI slots very close to each other. This saves

space and allows you to install either an ISA card

or a PCI card in the slot pair.

3Remove the corresponding expansion slot cover

from the computer chassis.

4Align the bus connector on the bottom of the host

adapter with the PCI bus slot. If the computer has

a card guide for aligning cards, be sure the end of

the host adapter is inserted in the card guide.

5Carefully press the host adapter into the slot.

6Secure the host adapter bracket to the computer

chassis with the screw from the removed expan-

sion slot cover.

Connecting the SCSI Bus LED

Most computers have an LED on the front panel that

lights when the hard disk is active. Follow these

steps if you want the LED to indicate activity on the

SCSI bus instead of non-SCSI disk activity.

Note: If you change the LED function the

LED will no longer light when your non-

SCSI disk drive is active.

AHA-2910/2910A Installation Guide

Part Number: 510874-00, Rev. A

Print Spec Number: 493882-00

Current Date: 7/6/95 ECN Date: 7/11/95

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1Find the LED cable and unplug it from the LED

connector in your computer.

2Connect the LED cable to the external LED con-

nector on the top edge of the host adapter. (See

the diagrams on page 2.) If the computer has a

two-position LED cable, connect it to pins 1 and 2

of the connector.

Do not replace the computer chassis cover or recon-

nect the power yet.

Connecting SCSI Devices

Caution: AHA-2910/2910A host adapters

support only single-ended SCSI devices. Dif-

ferential SCSI devices may be damaged if you

connect them to the host adapter. Most SCSI

devices are single-ended. Read the device

documentation.

Connecting Internal SCSI Devices

Use the internal SCSI cable included with your host

adapter to connect up to two internal SCSI devices. If

you need to connect more than two devices, you

must get a 50-pin internal SCSI cable with enough

connectors for all devices. See Terminating the SCSI

Bus on page 6 for more information.

1Grasp one end of the ribbon cable and insert it in

the host adapter’s internal SCSI connector. Align

pin 1 on the ribbon cable with pin 1 on the

connector.

Pin 1 on the ribbon cable is usually marked with a

contrasting color on one edge of the cable; pin 1

on the connector is usually marked with a small

triangle or ‘1’.

2Insert the next SCSI connector on the cable in the

SCSI connector on the first SCSI device. Maintain

correct pin-1 orientation.

3Attach the other internal SCSI devices, if any, to

the other connector(s) on the ribbon cable. Main-

tain correct pin-1 orientation.

AHA-2910/2910A Installation Guide

Part Number: 510874-00, Rev. A

Print Spec Number: 493882-00

Current Date: 7/6/95 ECN Date: 7/11/95

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4If the internal SCSI cable has a built-in terminator

on one end, disable termination on all internal

SCSI devices. If the cable has no built-in termina-

tor, enable termination on the device at the end of

the cable farthest from the host adapter and dis-

able termination on other internal devices. See the

SCSI device documentation for details.

Connecting External SCSI Devices

Note: AHA-2910i and AHA-2910Ai host

adapters support only internal SCSI devices

and therefore have no external SCSI

connector.

1Insert one end of the external SCSI cable in the

host adapter’s external SCSI connector.

2Attach the other end of the external SCSI cable to

one of the SCSI connectors on the first external

SCSI device.

3Connect other external SCSI devices, if any, by

daisy-chaining each device to the previous device

with a separate SCSI cable. Cables must run

sequentially from one device to the next, with no

branching.

4Insert an active standard or active pass-through

terminator plug in the second SCSI connector on

the last external SCSI device. See the device docu-

mentation for more information.

Assigning SCSI IDs

Be sure that each SCSI device, including the host

adapter, has a unique SCSI ID. See the device docu-

mentation for information on SCSI ID settings.

If your SCSI devices are SCAM-capable and you are

using an operating system that supports SCAM

(SCSI Configured AutoMatically) commands, SCSI

IDs for the host adapter and other devices will be

assigned automatically. (First be sure that the “Plug

and Play” SCAM Support option is enabled in

SCSISelect. See Configuring the Host Adapter on page

7.) If your SCSI devices are SCAM-tolerant, SCAM

can read their SCSI IDs, which are set with jumpers

AHA-2910/2910A Installation Guide

Part Number: 510874-00, Rev. A

Print Spec Number: 493882-00

Current Date: 7/6/95 ECN Date: 7/11/95

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or switches, but cannot change the IDs with software

commands.

If you have older SCSI devices that are not SCAM-

tolerant your computer may hang if SCAM is

enabled. This is because SCAM cannot read the SCSI

IDs that are set on the devices with jumpers or

switches. In this case, you must disable SCAM in

SCSISelect.

SCSI IDs 0 through 6 are available for your SCSI

devices. (SCSI ID 7 is assigned to the host adapter by

default.) Usually, you assign IDs 0 and 1 to the first

two SCSI hard drives.

Terminating the SCSI Bus

Devices at each end of the SCSI bus must be termi-

nated so data can be transmitted accurately. Termina-

tion will be correct if you followed the instructions

for connecting internal and external SCSI devices.

Never terminate more than two devices on the SCSI

bus. The AHA-2910/2910A detects installed SCSI

devices on the bus and sets its own termination auto-

matically, if Host Adapter Termination is set to Auto-

Term in the SCSISelect utility (this is the default).

Providing Termination in Multiple PC Configurations

You can share external SCSI devices between the

AHA-2910/2910A and a host adapter in another

computer. One host adapter can access the devices

when the other computer is powered OFF.

To do this, place a jumper shunt on the host

adapter’s multiple computer termination jumper, as

shown in the diagram on page 2. (This provides

active termination when the computer containing

the AHA-2910/2910A is powered OFF.) Then connect

the external SCSI devices in a single SCSI bus run-

ning between the external SCSI connectors on the

two host adapters.

AHA-2910/2910A Installation Guide

Part Number: 510874-00, Rev. A

Print Spec Number: 493882-00

Current Date: 7/6/95 ECN Date: 7/11/95

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Restarting the Computer

1Be sure all SCSI cables are connected securely.

2Put the chassis cover back on the computer, fol-

lowing the instructions in the documentation.

3Be sure all power switches are OFF, then reconnect

the computer power cables.

4Turn ON the external SCSI device(s), and then

turn ON the computer.

5If your system CMOS setup requires you to

enable PCI bus parameters, do so now.

Note: The PCI bus usually assigns IRQs and

port addresses automatically. However, in

some cases you may need to manually edit

the PCI bus parameters in your CMOS setup.

See your computer documentation.

In most cases your computer, host adapter, and SCSI

devices are now ready to use.

Configuring the Host Adapter

AHA-2910/2910A default settings work correctly in

most computers with PCI bus slots. The following

table lists the default settings:

You can change these settings with SCSISelect, a

menu-driven configuration utility that is included

with the host adapter. The SCSISelect utility lets you

change configuration settings without opening the

computer case or setting switches.

Settings for Host Adapter and All SCSI Devices Default Value

Host Adapter SCSI ID 7

SCSI Parity Checking Enabled

Host Adapter SCSI Termination AutoTerm

“Plug and Play” SCAM Support Enabled

Settings for Individual SCSI Device Default Value

Initiate Sync Negotiation Yes

Maximum Sync Transfer Rate 10 MBytes/sec

Enable Disconnection Yes

AHA-2910/2910A Installation Guide

Part Number: 510874-00, Rev. A

Print Spec Number: 493882-00

Current Date: 7/6/95 ECN Date: 7/11/95

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Changing the SCSISelect Settings

Follow these steps to change the host adapter default

settings with the SCSISelect configuration utility.

1If you have not yet installed the host adapter, do

so now by following the instructions in Sections 3,

4, and 5.

2Insert the SCSISelect diskette in your computer’s

floppy disk drive.

3Reboot the computer.

4When the SCSISelect screen appears, select Con-

figure/View Host Adapter Settings. The Config-

uration menu appears.

Note: To select an item in SCSISelect, move

the cursor to the item with the ↑and ↓keys,

then press Enter.

5Change the settings of the options listed on this

menu, or select SCSI Device Configuration or

Advanced Configuration Options to access the

settings on these sub-menus.

6When you have finished making configuration

changes, press Esc one or more times until you

see a message prompting you to save the changes.

Select Yes to save the changes, or select No to

abandon them.

7Press Esc until you see a message asking you if

you want to exit SCSISelect, then select Yes.

8Remove the SCSISelect diskette and reboot the

computer so the configuration changes can take

effect.

AHA-2910/2910A Installation Guide

Part Number: 510874-00, Rev. A

Print Spec Number: 493882-00

Current Date: 7/6/95 ECN Date: 7/11/95

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Troubleshooting Checklist

Answer these questions first if you have problems

installing or using your AHA-2910/2910A host

adapter:

■Is your computer PCI Rev 2.0 compliant?

■Did you install the host adapter in a 5-volt bus

master PCI slot? Refer to your computer docu-

mentation or try a different PCI slot.

■Are all SCSI devices turned ON?

■Are all SCSI bus cables and power cables properly

connected? Is pin-1 orientation correct?

■Do all devices on the SCSI bus, including the host

adapter, have unique SCSI IDs?

■Are all SCSI devices terminated properly?

■If SCAM is enabled, are all your SCSI devices

SCAM-capable or SCAM-tolerant? (See Assigning

SCSI IDs on page 5.)

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