Adaptec 2940U2W - Storage Controller U2W SCSI 80... User manual

USER’S
REFERENCE
SSCCSSII CCAARRDD22994400UU22WW

© 1997 Adaptec, Inc.
All rights reserved. Adaptec, and the
Adaptec logo are trademarks of Adaptec,
Inc. which may be registered in some
jurisdictions.
Printed in Singapore
STOCK NO.: 511795-00, Rev. A RQ 12/97

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▼ ▼ ▼ ▼ SCSI Card 2940U2W
User’s Reference

iii
▼ ▼ ▼ ▼ Contents
Understanding SCSI 1
SCSI IDs 1
SCAM Protocol 2
Terminating the SCSI Bus 3
Troubleshooting 4
Troubleshooting Checklist 4
Troubleshooting in Windows 95 5
Common Error Messages 9
Using the SCSI Card 2940U2W and SCSI
Peripherals 10
Using SCSI Peripherals 10
Hard Disk Drives 10
Scanners 11
SCSI Peripheral Display at Bootup 12
Installing Multiple SCSI Cards 12
Connecting the LED Connector 13
Using SCSI and IDE (or EIDE) Peripherals 14
Replacing a Non-Adaptec SCSI Card with an Adaptec SCSI
Card 14
Configuring the SCSI Card 2940U2W with
SCSI
Select
15
Starting SCSISelect 16
Exiting SCSISelect 17
Using SCSISelect Settings 17
Basic Host Adapter Settings 17
Boot Device Options 18

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SCSI Card 2940U2W User’s Reference
SCSI Device Configuration 19
Advanced Configuration Options 20
Using SCSI Disk Utilities 22
Obtaining SCSI Cables and Adapters 23
External Cables 23
External Connector Diagrams 23
Internal Cables 24
Internal Connector Diagrams 24
Cabling Examples 25
Maximum Cable Lengths 27
❒

1
Understanding SCSI
SCSI (pronounced “scuzzy”) stands for Small Computer Systems
Interface. SCSI is an industry standard computer interface for con-
necting SCSI peripherals (such as a hard disk drive, CD-ROM drive,
or scanner) to a common SCSI bus.
A SCSI bus is an electrical pathway that consists of a SCSI adapter
card (such as the SCSI Card 2940U2W) installed in a computer and
one or more SCSI peripherals. SCSI cables are used to connect the
peripherals to the SCSI adapter card.
For the SCSI bus to function properly, SCSI IDs must be assigned to
SCSI devices (SCSI peripherals and SCSI card), and the SCSI bus
must be properly terminated.
SCSI IDs
Each peripheral attached to the SCSI Card 2940U2W, as well as the
SCSI Card 2940U2W itself, must be assigned a unique SCSI ID num-
ber from 0 to 15. A SCSI ID uniquely identifies each SCSI device on
the SCSI bus and determines priority when two or more devices are
trying to use the SCSI bus at the same time.
Refer to the peripheral’s documentation to set the SCSI ID. Here are
some general guidelines for SCSI IDs:
■For internal SCSI peripherals, the SCSI ID usually is set by con-
figuring a jumper on the peripheral.
■For external SCSI peripherals, the SCSI ID usually is set with a
switch on the back of the peripheral.

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SCSI Card 2940U2W User’s Reference
■SCSI ID numbers don’t have to be sequential, as long as the
SCSI Card 2940U2W and each peripheral has a different num-
ber. For example, you can have an internal SCSI peripheral
with ID 0, and an external SCSI peripheral with ID 6. Gaps in
the sequence of numbers don’t matter.
■SCSI ID 7 has the highest priority on the SCSI bus. The priority
of the remaining IDs, in descending order, is 6 to 0, 15 to 8.
■The SCSI Card 2940U2W is preset to SCSI ID 7 and should not
be changed. This gives it the highest priority on the SCSI bus.
■Most internal SCSI hard disk drives come from the factory pre-
set to SCSI ID 0.
■If you have 8-bit SCSI peripherals, they must use SCSI IDs 0, 1,
2, 3, 4, 5, or 6. SCSI ID 0 is recommended for the first SCSI hard
disk drive.
■If you are booting your computer from a SCSI hard disk drive
connected to the SCSI Card 2940U2W, the Boot Target ID set-
ting in the SCSISelect utility must correspond to the SCSI ID of
the peripheral from which you are booting. By default, the
Boot Target ID is set to 0. See Boot Device Options on page 18 to
change the Boot Target ID.
■In Windows®95, you can use the Device Manager to view the
SCSI ID (and other details) assigned to each SCSI device
installed.
■If you installed Adaptec®EZ-SCSI®software, you can use the
SCSI Explorer utility to view the SCSI ID (and other details)
assigned to each SCSI device installed.
SCAM Protocol
The SCSI Card 2940U2W supports the SCSI Configured AutoMati-
cally (SCAM) protocol, which assigns SCSI IDs dynamically and
resolves SCSI ID conflicts automatically when you start the com-
puter. If your computer includes SCSI disk drives or other peripher-
als that support SCAM, you do not need to manually assign SCSI
IDs to these peripherals. To enable SCAM support, see Configuring
the SCSI Card 2940U2W with SCSISelect on page 15.

3
Understanding SCSI
Terminating the SCSI Bus
To ensure reliable communication on the SCSI bus, the ends of the
SCSI bus must be properly terminated. This is accomplished when
the peripheral at the end of each cable, or the end of the cable itself,
has a terminator installed (or enabled). The peripherals between the
ends of each cable must have its terminator removed (or disabled).
Since the method for terminating a SCSI peripheral can vary widely,
refer to the peripheral’s documentation for instructions on how to
enable or disable termination. Here are some general guidelines for
termination:
■Termination on internal SCSI peripherals usually is controlled
by manually setting a jumper or a switch on the peripheral, or
by physically removing or installing one or more resistor mod-
ules on the peripheral.
■Termination on external SCSI peripherals usually is controlled
by installing or removing a SCSI terminator. On some external
peripherals, termination is controlled by setting a switch on the
back of the drive.
■By default, termination on the SCSI Card 2940U2W itself is
automatic (the preferred method). To manually set termination
on the SCSI Card 2940U2W, see Configuring the SCSI Card
2940U2W with SCSISelect on page 15.
■Internal Ultra2 peripherals are set at the factory with termina-
tion disabled and cannot be changed. Proper termination for
internal Ultra2 peripherals is provided by the built-in termina-
tor at the end of the Ultra2 internal SCSI cable.
■Most non Ultra2 SCSI peripherals come from the factory with
termination enabled.

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SCSI Card 2940U2W User’s Reference
Troubleshooting
Most problems can be resolved by following the recommendations
in Troubleshooting Checklist below. If you still experience problems
after following the recommendations, continue with the remainder
of this section.
Troubleshooting Checklist
Most problems with using the SCSI Card 2940U2W result from
errors in preparing and connecting peripherals on the SCSI bus. If
you have problems, check these items first.
Note:
If you have problems with a specific SCSI peripheral
when other connected SCSI peripherals are working cor-
rectly, please contact the manufacturer of the problem
peripheral for troubleshooting information.
■Are all SCSI peripherals turned on?
■Are all SCSI cables and power cables properly connected?
■Is the SCSI Card 2940U2W firmly seated and secured in the
PCI expansion slot?
■Is the PCI expansion slot PCI Rev. 2.1 or higher compliant and
does it support Bus Mastering?
■Are all SCSI peripherals and the SCSI Card 2940U2W assigned
unique SCSI IDs? (See Setting Up SCSI Peripherals on page 3.)
■Are all SCSI peripherals terminated properly? (See Setting Up
SCSI Peripherals on page 3.)
■If your computer allows you to set up configuration options
when the computer first boots up (that is, through CMOS
setup), are the following options set up as specified?
■If there is an Interrupt Type or Interrupt Line option in the
Setup program, select Int-A or Interrupt Type = A (you
may also be required to change a motherboard jumper set-
ting).
■If there is a Triggering Interrupt option, select Level.

5
Troubleshooting
■If there is an option to enable or disable bus mastering for
the PCI slots, select Enabled.
■If there is an option to enable or disable individual PCI
slots, be sure the slot in which you install the SCSI Card
2940U2W 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 computer BIOS
will not try to assign these IRQs to other PCI boards.
■In some computers the BIOS reserves a set of available
IRQs for PCI boards, and you have to assign these IRQs
manually.
Note:
Some configuration options apply to a specific PCI bus
slot, so if you change any option be sure you are applying
the change to the correct slot. Check your computer docu-
mentation to determine the correct PCI bus slot.
Troubleshooting in Windows 95
When I start Windows 95, the system locks up when the Windows logo
is displayed. How can I get the system to start so that I can verify that
the SCSI card is functioning normally?
1
Start or restart your computer. View the messages that appear
onscreen.
2
When the message “Starting Windows 95” appears, press and
release the F8 function key while the text is on your screen.
3
From the menu that is displayed, select Safe Mode. (It may
take several minutes for Windows 95 to load.)
4
If the system completes the boot to the desktop, the core soft-
ware is functional; resources, software conflicts and/or hard-
ware need to be checked.
5
If the system still fails to boot, and the boot drive is on an exist-
ing IDE or SCSI controller, shut down the system, remove the
SCSI Card 2940U2W, and restart the computer.

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SCSI Card 2940U2W User’s Reference
6
Verify an IRQ is available by viewing resources in System
Properties.
7
Verify the Operating System is set to Optimal Performance by
checking the Performance tab under System Properties.
How can I tell if the SCSI Card 2940U2W software driver is loading
properly?
1
Click the Start button, point to Settings, then click Control
Panel.
2
Double-click the System icon.
3
Click the Device Manager tab.
4
Double-click the SCSI Controller icon. The software driver for
the SCSI Card 2940U2W is listed as “Adaptec AHA-2940U2W
PCI Ultra2 SCSI Controller.”
■If the driver is listed, the SCSI Card 2940U2W driver is
loading properly.
■If the driver is listed but has an exclamation mark inside a
yellow circle, the software driver may be in conflict with
other hardware using the same resources. Double-click the
icon to see the device status and possible solutions.
■If the driver is listed but has an “X” inside a red circle, the
SCSI Card 2940U2W software driver is disabled and isn’t
loading (see below).
■If the SCSI Controller icon or the SCSI Card 2940U2W soft-
ware driver is not listed, reinstall the driver (see below).
Note:
Software upgrades (including downloadable drivers)
for Adaptec products are available on the Adaptec Web Site
at http://www.adaptec.com .

7
Troubleshooting
An “X” inside a red circle appears with the SCSI Card 2940U2W
software driver in Device Manager. What does this mean?
The SCSI Card 2940U2W software driver is disabled and isn’t load-
ing. To enable the driver:
1
Double-click the SCSI Card 2940U2W software driver in
Device Manager.
2
Under the General tab, check the Original Configuration (cur-
rent) box.
What if there is no SCSI controller icon under Device Manager, or the
software driver for the SCSI Card 2940U2W does not appear under
Device Manager?
If the SCSI controllers icon or the software driver do not appear:
1
Double-click the Add New Hardware icon in Control Panel.
2
Select Yes on the second screen of the Add New Hardware
Wizard to have Windows search for the SCSI Card 2940U2W.
3
Follow the onscreen instructions.
If Windows 95 does not detect the SCSI Card 2940U2W, run the Add
New Hardware Wizard again:
1
Double-click the Add New Hardware icon in Control Panel.
2
Select No on the second screen of the wizard.
3
Select SCSI controllers on the next screen.
4
Select “Adaptec AHA-2940U2W PCI Ultra2 SCSI Controller.”
If “Adaptec AHA-2940U2W PCI Ultra2 SCSI Controller” is not on
the list, you may be able to install the driver from the Adaptec
EZ-SCSI Setup Diskette. Follow these steps:
1
Place the Adaptec EZ-SCSI Setup Diskette in the floppy disk
drive.
2
Double-click the Add New Hardware icon in Control Panel.
3
Select No on the second screen of the wizard.
4
Select SCSI controllers on the next screen.
5
Click the Have Disk button, then click the Browse button.

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SCSI Card 2940U2W User’s Reference
6
Look in the \drivers\storage directory of the Windows 95
CD-ROM (or the root directory of the EZ-SCSI Setup Diskette)
and select the model of your SCSI card.
How can I check the status of a resource (for example, IRQ,
Memory, I/O)?
1
Click the Start button, point to Settings, then click Control
Panel.
2
Double-click the System icon.
3
Click the Device Manager tab.
4
Double-click the Computer icon.
5
On the View Resources tab, click the option button for the type
of resource you want to check.
6
The setting and the hardware using the setting are displayed.
■If a specific resource is not listed, the resource is not used
by a device.
■If a resource is listed more than once, the resource is used
by more than one device.
■If a resource is used by an unknown device, the resource is
used but the device using the resource cannot be detected.
How do I use the Hardware Conflict Troubleshooter in Windows 95?
1
Click the Start button, then click Help.
2
From the Contents tab, double-click Troubleshooting.
3
Double-click If you have a hardware conflict.
4
Follow the step-by-step instructions in the Windows Help
window.

9
Troubleshooting
Common Error Messages
The following messages may appear at bootup:
“Device connected, but not ready”
The host received no answer when it requested data from an
installed SCSI peripheral.
■Run SCSISelect®and set the Send Start Unit Command to Yes
for the particular SCSI peripheral.
■Make sure the drive is set to spin up when the power is
switched on. (See the documentation for the peripheral.)
“Start unit request failed”
The SCSI Card BIOS was unable to send a Start Unit Command to
the peripheral.
■Run SCSISelect and disable the Send Start Unit Command for
the peripheral.
“Time-out failure during...”
An unexpected time-out occurred.
■Verify the SCSI bus is properly terminated.
■Verify all cables are properly connected.
■Try disconnecting the SCSI peripheral cables from the SCSI
card and then starting the computer. If the computer
successfully restarts, one of the SCSI peripherals may be
defective.

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SCSI Card 2940U2W User’s Reference
Using the SCSI Card
2940U2W and SCSI
Peripherals
This section provides useful information on using the SCSI Card
2940U2W and your SCSI peripherals. For specific information, refer
to the documentation that came with your SCSI peripheral.
Using SCSI Peripherals
Hard Disk Drives
■Every SCSI hard disk drive must be physically low-level for-
matted, partitioned, and logically formatted before it can be
used to store data. SCSI hard disks are physically low-level for-
matted at the factory and do not usually need to be formatted
again.
If you connect a new SCSI hard disk drive to your SCSI card,
you must partition and logically format the drive. For DOS
and Windows (3.x and 95) use the DOS Fdisk and Format com-
mands (see your computer, DOS, and Windows documenta-
tion). 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 is required
for SCSI hard disk drives. See your computer documentation
for details.
■If both SCSI and non-SCSI (for example, IDE) disk drives are
installed, then the non-SCSI disk drive is typically the boot
drive. If your computer supports BBS (BIOS Boot Specifica-
tion), both SCSI and non-SCSI disk drives can coexist and you
can specify which drive to boot from. Refer to your computer
documentation for more information.

11
Using the SCSI Card 2940U2W and SCSI Peripherals
Ultra2 Hard Disk Drives
■We recommend keeping your Ultra2 hard disk drives separate
from your non Ultra2 peripherals. Connecting a non Ultra2
hard disk drive to the Ultra2 connector on the SCSI Card
2940U2W causes the Ultra2 SCSI segment of the SCSI bus to
drop down to Ultra SCSI performance levels (40 MBytes/sec).
■Do not connect your Ultra2 hard disk drives to connectors
other than the Ultra2 connectors on the SCSI Card 2940U2W.
■Internal Ultra2 SCSI peripherals come from the factory with
termination disabled and cannot be changed. Proper termina-
tion is provided by the built-in terminator at the end of the
Ultra2 internal SCSI cable provided in the kit.
Scanners
■You will need to install the scanner manufacturer’s proprietary
software drivers. See your scanner’s documentation for details.
Ultra2 External Connector
Ultra2 Internal Connector
Figure 1. Ultra2 Internal and External Connectors

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SCSI Card 2940U2W User’s Reference
SCSI Peripheral Display at Bootup
At bootup, each peripheral attached to the SCSI Card 2940U2W is
identified by SCSI ID, name, the SCSI segment to which it is
attached (Ultra2 or Fast/Ultra), and the mode (LVD-Ultra2 or SE-
Ultra) in which it is running. For example, a message similar to the
following appears on the screen at bootup:
SCSI ID:0 Seagate ST39173LC Ultra2 LVD
In this example, the peripheral is assigned SCSI ID 0; “Seagate
ST39173LC” refers to the name of the peripheral; “Ultra2” indicates
that the peripheral is attached to the Ultra2 SCSI segment; “LVD”
means that the peripheral is running in LVD-Ultra2 mode.
LVD (Low Voltage Differential) is the enabling technology for
Ultra2. If the peripheral is running in LVD-Ultra2 mode, this indi-
cates that the peripheral’s maximum transfer rate is set at the Ultra2
SCSI performance level (80 MBytes/sec). SE (Single-Ended) is the
enabling technology for Fast SCSI and Ultra SCSI. If the peripheral is
running in SE-Ultra mode, this indicates that the peripheral’s maxi-
mum transfer rate is set at the Ultra SCSI performance level (40
MBytes/sec).
Note:
If any peripheral is attached to the Ultra2 SCSI seg-
ment and is running at SE mode, one or more Wide Ultra/
Ultra peripherals is attached to the Ultra2 SCSI segment and
is causing the Ultra2 SCSI segment to run at speeds up to
40 MBytes/sec instead of 80 MBytes/sec.
Installing Multiple SCSI Cards
■You can install multiple SCSI cards in your computer; you are
limited only by the available system resources (for example,
IRQ settings, I/O port addresses, BIOS addresses, and so forth)
not used by other cards installed in your computer.
■Each SCSI card you install forms a separate SCSI bus with a
different set of SCSI peripherals. SCSI IDs can be reused as
long as the ID is assigned to a peripheral on a different SCSI
card (for example, each SCSI card can have a peripheral with
SCSI ID 2).

13
Using the SCSI Card 2940U2W and SCSI Peripherals
■If you have two or more SCSI cards, enable the BIOS on the boot
SCSI card only; disable the BIOS on the remaining SCSI cards.
Connecting the LED Connector
(Optional feature) Most computers have an LED disk activity light on
the front panel. If you choose to disconnect the cable from the LED
connector on the motherboard and connect it to the LED connector
on the SCSI card, the LED on the front panel of the computer will
light whenever there is activity on the SCSI bus (see Figure 2).
Note:
If you are using non-SCSI disk drives (for example,
IDE), you may not want to connect your computer’s LED to
the SCSI card, since the LED will no longer indicate non-
SCSI disk activity.
LED Connector
on host adapter
1
LED Cable
from
motherboard
Pin 1
1
2-pin
LED
Cable
Figure 2. Connecting the LED Cable to the LED Connector

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SCSI Card 2940U2W User’s Reference
Using SCSI and IDE (or EIDE) Peripherals
■All Adaptec SCSI cards can coexist with another controller
(IDE, EIDE, RLL, etc.) installed in the computer.
■If you have both an IDE hard disk drive and a SCSI hard disk
drive, the IDE drive is typically the boot drive. In this case, dis-
able the BIOS on the SCSI card (see Advanced Configuration
Options on page 20). If your computer supports BBS (BIOS Boot
Specification), both SCSI and non-SCSI disk drives can coexist
and you can specify which drive to boot from. Refer to your
computer documentation for more information.
■You cannot connect an IDE peripheral to a SCSI card, or a SCSI
peripheral to an IDE card (controller).
■Disable the BIOS on the SCSI card if no SCSI hard disk drives
are installed (see Advanced Configuration Options on page 20).
Replacing a Non-Adaptec SCSI Card with an
Adaptec SCSI Card
■SCSI is standard, but how data is translated on to a hard disk
drive is not. Each SCSI card manufacturer uses its own transla-
tion schemes for writing data to a disk. To use a hard disk
drive previously connected to a non-Adaptec SCSI card, low-
level format the drive after connecting to the Adaptec SCSI
card. (See Using SCSI Disk Utilities on page 22.)
Caution:
A low-level format destroys all data on the drive.
Be sure to back up your data before performing a low-level
format.