User’s Guide AHA-3940U/3940UW/3940UWD MultiChannel PCI-to-UltraSCSI Host Adapters with SCSISelect Utility AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
Adaptec, Inc. 691 South Milpitas Boulevard Milpitas, CA 95035 © 1996, 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.: 511041-00, Rev. B MR 2/97 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
▼ ▼ ▼ ▼ AHA-3940U/3940UW/ 3940UWD MultiChannel PCI-to-UltraSCSI Host Adapters with SCSISelect Utility User’s Guide R AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
Copyright © 1996, 1997 Adaptec, Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Adaptec, Inc., 691 South Milpitas Blvd., Milpitas, CA 95035. Trademarks Adaptec, the Adaptec logo, AHA, EZ-SCSI, MultiChannel, PhaseEngine, and SCSISelect are trademarks of Adaptec, Inc. which may be registered in some jurisdictions.
– The Adaptec Interactive Fax system provides product literature, answers to commonly asked questions, and current information about Adaptec products and services. The Adaptec Interactive Fax system is available 23 hours a day, 7 days a week. The Fax system is out of service 1 hour each day. You can call this service directly at 408-957-7150. ■ For sales information, call 800-959-SCSI (7274) or 408-945-2550, M–F 6:00 a.m. to 5:00 p.m., Pacific Time.
AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
▼ ▼ ▼ ▼ Contents 1 Introduction Product Features 1-2 PCI Bus Interface 1-3 PCI-to-PCI Bridges 1-3 Data Transfer Rates 1-3 AHA-3940U 1-3 AHA-3940UW/3940UWD 1-4 Maximum Offloading of the Host CPU 1-4 Disk Array Support 1-4 UltraSCSI/Fast SCSI-2 Implementation 1-4 Multiple Device Support 1-5 Conventions 1-5 Advisories 1-7 Support and Information Services 1-8 2 Installing the Host Adapter and SCSI Devices Host Adapter Layout 2-2 Inserting the Host Adapter in a PCI Slot 2-3 Connecting SCSI Cables and Devices
AHA-3940U/3940UW/3940UWD User’s Guide Terminating the SCSI Bus 2-12 Terminating SCSI Devices 2-12 Terminating the Host Adapter 2-12 Terminating SCSI Channel A on the AHA-3940U/ 3940UW and Both Channels on the AHA-3940UWD 2-13 Terminating SCSI Channel B on the AHA-3940U/ 3940UW 2-14 SCSI IDs 2-14 SCSI ID Priority 2-14 Setting SCSI IDs 2-15 SCSI Bus Activity LED Connector 2-15 Completing Installation 2-16 Running the Computer’s Setup Program 2-17 3 Configuring Your Host Adapter Default Configuration Setting
Contents 5 Troubleshooting BIOS Startup Messages 5-2 Disk Drive Configuration Problems 5-3 Booting the Computer from a SCSI Drive 5-3 Using a Standard Drive as C and a SCSI Drive as D 5-4 Using SCSI Drives as C and D 5-5 Computer Hangs, or Channel Cannot Find the Drives 5-5 Other Problems and Solutions 5-6 A Multiple Computer Configuration Restrictions and Requirements A-1 B Optimizing Performance Enabling Synchronous Negotiation B-1 Enabling Wide Negotiation B-2 Disabling the Channel BIOS B-2 Enabling S
AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
▼ ▼ ▼ ▼ Figures Figure 2-1 2-2 2-3 2-4 2-5 2-6 2-7 AHA-3940U Components 2-2 2-8 2-9 2-10 2-11 2-12 2-13 Connecting a Second Internal SCSI Device 2-9 2-14 Host Adapter Termination on SCSI Channel B (AHA-3940U/3940UW) 2-14 2-15 SCSI LED Connector 2-16 3-1 3-2 3-3 3-4 3-5 BIOS Banner 3-3 3-6 3-7 SCSI Parity Checking Selection 3-9 3-8 Boot Device Options 3-10 AHA-3940UW Components 2-2 AHA-3940UWD Components 2-2 Inserting the Host Adapter 2-4 68-pin-to-50-pin Converter 2-7 Internal SCSI Ribbon C
AHA-3940U/3940UW/3940UWD User’s Guide Figure 3-9 SCSI Device Configuration Screen for AHA-3940U 3-11 3-10 3-11 Advanced Configuration Options Screen 3-15 A-1 SCSI Devices Shared by Two Computers A-2 SCSI Disk Utilities Screen for AHA-3940UW/ 3940UWD 3-18 x AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
▼ ▼ ▼ ▼ 1 Introduction The Adaptec AHA-3940U, AHA-3940UW, and AHA-3940UWD MultiChannel PCI-to-UltraSCSI Host Adapters are designed for use in computers that have 5-volt Peripheral Component Interconnect (PCI) interface slots. PCI is a local bus interface that enables highspeed data transfer. Your computer must be PCI Rev. 2.1-compliant and the motherboard BIOS must support PCI-toPCI Bridges. If you aren’t sure whether the motherboard BIOS supports PCI-to-PCI Bridges, contact the motherboard vendor.
AHA-3940U/3940UW/3940UWD User’s Guide discuss the same topics—installing and configuring the AHA-3940U/3940UW/3940UWD—but the User’s Guide provides more detailed instructions. If you have installed SCSI devices before, you might find it faster to use the Installation Guide. Beginning users should use the more detailed instructions in this User’s Guide.
Introduction AHA-3940U/3940UW/3940UWD host adapters include the onboard SCSISelectTM configuration utility. SCSISelect lets you change settings such as SCSI Termination and SCSI Parity Checking without opening the computer and physically configuring the host adapter. SCSISelect also includes a SCSI low-level formatting utility.
AHA-3940U/3940UW/3940UWD User’s Guide AHA-3940UW/3940UWD ■ Up to 40.0 MBytes/sec synchronous Wide UltraSCSI data rate per channel ■ Up to 20.0 MBytes/sec synchronous Wide Fast SCSI data rate per channel ■ Up to 10.0 MBytes/sec synchronous Wide SCSI data rate per channel ■ Up to 6.
Introduction ■ Uses the superior SCSI-2 (Alternative 1) external connector and standard internal ribbon connector (on the AHA-3940UWD, there are two very high density external connectors) ■ Tagged Queuing support ■ SCSI termination power-down control ■ Support for multiple logical units ■ Parity handling in Data, Message, Status, Selection/ Reselection, and Command phases ■ Active negation Multiple Device Support ■ AHA-3940U supports up to seven SCSI devices per channel (14 devices total) ■
AHA-3940U/3940UW/3940UWD User’s Guide Conventions The following typographic conventions are used in this document: bold Used for keystrokes (… press the Enter key …) and screen selection fields (… select Advanced Configuration Options …). Helvetica Used for operator entry that must be typed exactly as shown (… device=c:\scsi\aspi7dos.sys …) and for screen messages (…Enter Password …). Helvetica Italics Used to represent text you must determine and type in (… enter nn for number…).
Introduction Advisories Advisories are short notes that stress an important point or warn of a potential hazard to the system, data, or the user. This document uses three kinds of advisories: Note: Text set off in this way presents reminders, tips, or suggestions that may simplify the assembly and use of the host adapter. Caution: Failure to observe this type of advisory could result in damage to your system, devices, or data.
AHA-3940U/3940UW/3940UWD User’s Guide Support and Information Services AHA-3940U/3940UW/3940UWD host adapters are designed for easy installation and use. We have tried to make this document and our other documentation complete and clear. If you need further assistance, please contact Adaptec.
▼ ▼ ▼ ▼ 2 Installing the Host Adapter and SCSI Devices This chapter explains how to physically install an AHA-3940U/ 3940UW/3940UWD host adapter in your computer and connect SCSI devices to it. You may need to run your computer’s Setup program as part of the installation process. See Running the Computer’s Setup Program on page 2-17 for more information.
AHA-3940U/3940UW/3940UWD User’s Guide Host Adapter Layout Figure 2-1 identifies the major AHA-3940U components. Figure 2-2 identifies the major AHA-3940UW components. Figure 2-3 identifies the major AHA-3940UWD components. Following the figures, a table describes these components. J2 J1 J6 J3 J4 U6 J5 U8 U10 U11 U12 Figure 2-1. AHA-3940U Components J3 J2 J1 J4 U8 J6 U10 U12 J5 U13 U14 Figure 2-2. AHA-3940UW Components J1 J3 J2 J4 J5 U8 J6 U10 U12 J7 U14 U13 Figure 2-3.
Installing the Host Adapter and SCSI Devices AHA-3940U AHA-3940UW AHA-3940UWD J1 J2 J3 J1 J2 J3 J1 J2 J3 J4 J5 J6 U6 U8 U10 U11 U12 J4 J5 J6 U8 U10 U12 U13 U14 J4 J7 J5 J6 U8 U10 U12 U13 U14 Description Internal SCSI Connector—Channel A 1 Internal SCSI Connector—Channel B 1 Multiple computer termination jumper, Channel B2 External LED Connector External SCSI Connector—Channel A1 External SCSI Connector—Channel B3 Termination Jumper—Channel A AIC-7880 Controller—Channel A AIC-7880 Controller—Channe
AHA-3940U/3940UW/3940UWD User’s Guide your computer has. PCI bus slots are typically white or ivory and are shorter than ISA or EISA slots. Usually, there are three PCI slots. One of these may be a shared slot. A shared slot has connectors for both ISA and PCI, but can accept only one kind of board at a time. 4 Remove the corresponding expansion slot cover from the computer chassis.
Installing the Host Adapter and SCSI Devices Connecting SCSI Cables and Devices Choosing SCSI Cables Always use high-quality SCSI cables to connect the host adapter to devices on the SCSI bus. Poor-quality cables can cause data corruption, parity errors, and other problems. High-quality cabling is especially critical if you use UltraSCSI or Fast SCSI data transfer rates. The round cables used for external SCSI devices vary widely in quality and electrical characteristics.
AHA-3940U/3940UW/3940UWD User’s Guide Connecting Internal SCSI Devices Read the device documentation if you need to physically install a SCSI device inside your computer before attaching the cables. To connect internal SCSI devices to an AHA-3940U/3940UW/ 3940UWD host adapter, you need the following: ■ A 50-pin internal SCSI ribbon cable for the AHA-3940U. (Or two cables, if you are using both internal SCSI connectors.) ■ A 68-pin internal SCSI ribbon cable for the AHA-3940UW or AHA-3940UWD.
Installing the Host Adapter and SCSI Devices converter with an 8-bit device is at the end of the cable, the bus does not terminate properly. To attach a converter, first plug the converter into the A/B device and then connect the converter to the internal Wide SCSI bus. Note: The following diagrams show the 50-pin internal connector used with the AHA-3940U. The AHA-AHA-3940UW and AHA-3940UWD use 68-pin high-density connectors.
AHA-3940U/3940UW/3940UWD User’s Guide 2 Plug the last connector on the ribbon cable into the SCSI connector on the internal SCSI device, as shown in Figure 2-7. Pin 1 Colored Stripe Internal SCSI Device Figure 2-7. Internal SCSI Ribbon Cable to Internal SCSI Device 3 To connect a second internal SCSI device, plug the middle connector of the SCSI ribbon cable into the SCSI connector on the second internal SCSI device, as shown in Figure 2-8.
Installing the Host Adapter and SCSI Devices Connecting External SCSI Devices You can daisy-chain up to seven external SCSI devices to Channel A of the AHA-3940U. You can daisy-chain up to fifteen external SCSI devices to Channel A of the AHA-3940UW or Channels A and B of the AHA-3940UWD. Daisy-chaining means connecting multiple devices with multiple cables.
AHA-3940U/3940UW/3940UWD User’s Guide as shown in Figure 2-10. The AHA-3940UWD has two external connectors (not shown). External SCSI Cable External SCSI Device Figure 2-10. External Cable to External SCSI Device 3 To connect other external SCSI devices, daisy chain each device to the previous device until all external SCSI devices have been connected, as shown in Figure 2-11. (Again, the AHA-3940UWD’s two external connectors are not shown.) External SCSI Cables Figure 2-11.
Installing the Host Adapter and SCSI Devices external SCSI-2 male 68-pin to SCSI-2 female 50-pin converter (available from Adaptec). Follow these steps: 1 Daisy-chain all 16-bit devices together with external SCSI-2 Wide cables. 2 Daisy-chain all 8-bit devices together with external SCSI-2 Narrow cables. 3 Connect the first device in the 16-bit device daisy chain to the host adapter with an appropriate external Wide cable. 4 Plug the converter into the last device in the 16-bit device daisy chain.
AHA-3940U/3940UW/3940UWD User’s Guide Terminate the SCSI device at the end of the internal or external SCSI cable, and disable termination on all other devices on the SCSI bus. Read the device documentation if you are not sure how to enable or disable termination on your SCSI devices. Note: Some SCSI disk drives allow termination power to be supplied to their resistor modules from the SCSI bus instead of from the drive’s power supply.
Installing the Host Adapter and SCSI Devices is automatically Enabled. Always connect the host adapter to the end of the internal cable. Host Adapter Termination Enabled Automatically Termination Enabled No Termination Figure 2-12. Internal Devices on SCSI Channel A ■ If you attach SCSI devices to both internal and external connectors, as shown in Figure 2-13, host adapter termination is automatically Disabled. In this configuration, the host adapter is in the middle of the SCSI bus.
AHA-3940U/3940UW/3940UWD User’s Guide Host Adapter Termination Enabled Automatically Termination Enabled No Termination Figure 2-14. Host Adapter Termination on SCSI Channel B (AHA-3940U/3940UW) Note: Do not set a channel’s termination to Disable if there is no device on that SCSI bus. It may hang the system. SCSI IDs Each device on the SCSI bus, including the host adapter, must have a unique SCSI ID. The SCSI ID serves two purposes: ■ It uniquely defines each SCSI device on the bus.
Installing the Host Adapter and SCSI Devices Setting SCSI IDs Setting SCSI IDs is a two-step process: 1 Determine the SCSI ID of each device on the SCSI bus. The default SCSI ID for Channels A and B of the host adapter is 7, the highest priority on the bus. You can change the ID(s) using SCSISelect, if necessary, but we recommend that you leave the ID for both channels at 7. To determine the SCSI IDs, read the devices’ documentation and examine their switch settings or jumper settings.
AHA-3940U/3940UW/3940UWD User’s Guide 2 Connect the LED cable to the SCSI activity LED connector on the host adapter, as shown in Figure 2-15. LED Cable Pin 1 1 LED Connector J4 Figure 2-15. SCSI LED Connector If the computer has a two-position LED cable, connect it to pins 1 and 2 of the LED connector.
Installing the Host Adapter and SCSI Devices Complete these steps to finish the installation process: 1 Replace and secure the cover of the computer case. 2 Reconnect the power cords to all external SCSI devices and the computer. 3 Turn ON the power to all devices. 4 Boot the computer. If you need to change the configuration of the host adapter or SCSI devices, follow the directions in Chapter 3, Configuring Your Host Adapter.
AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
▼ ▼ ▼ ▼ 3 Configuring Your Host Adapter AHA-3940U/3940UW/3940UWD host adapters include an onboard SCSISelect configuration utility that lets you change host adapter settings without opening the computer or handling the host adapter. SCSISelect also provides utilities for formatting SCSI disk devices and scanning them for defects. In addition, SCSISelect allows you to list the SCSI IDs of devices attached to the host adapter.
AHA-3940U/3940UW/3940UWD User’s Guide Default Configuration Settings This table lists the settings you can change with SCSISelect and the default value for each setting. Some settings apply to the channels; other settings apply individually to each device on the bus.
Configuring Your Host Adapter When to Use SCSISelect Use SCSISelect if you need to ■ Change any of the default values ■ Check or change SCSI device settings that may conflict with those of other devices (e.g., SCSI ID) ■ Perform low-level formatting on new SCSI disk devices Starting SCSISelect To start SCSISelect, press Ctrl+A when the BIOS banner appears during bootup, as shown in Figure 3-1. Adaptec AHA-3940U/3940UW BIOS v1.22 (c) 1996 Adaptec, Inc. All Rights Reserved.
AHA-3940U/3940UW/3940UWD User’s Guide Selecting a SCSI Channel Each AHA-3940U/3940UW/3940UWD host adapter has two SCSI channels. Each channel operates independently and must be configured separately in SCSISelect. The first SCSISelect screen allows you to select either Channel A or Channel B, as shown in Figure 3-2. Press the ↑ and ↓ keys to highlight the channel you want to configure, then press Enter to select it.
Configuring Your Host Adapter After you select the channel, the SCSISelect Options menu appears, as shown in Figure 3-3. Adaptec AHA-3940 Ultra/ Ultra W SCSISelect(TM) Utility v1.22 AHA-3940 Ultra/Ultra W at Bus:Channel 01:A Would you like to configure the PCI device or run the SCSI disk utilities? Select the option and press . Press to switch between color and monochrome modes.
AHA-3940U/3940UW/3940UWD User’s Guide Configure/View Host Adapter Settings From the Options menu, select Configure/View Host Adapter Settings to see the Configuration menu, shown in Figure 3-4. This menu lists the following settings under SCSI Channel Interface Definitions: ■ Host Adapter SCSI ID: Change the SCSI ID of the channel from its default ID of 7. ■ SCSI Parity Checking: Enable or disable parity checking. ■ Host Adapter SCSI Termination: Enable or disable channel termination.
Configuring Your Host Adapter The Configuration menu has the following additional options for advanced users: ■ Boot Device Options: Specify ID and LUN to boot from. ■ SCSI Device Configuration: Specify for each SCSI device the maximum synchronous transfer rate, use of the Start Unit command, and other criteria. ■ Advanced Configuration Options: Select advanced options for configuring the channel.
AHA-3940U/3940UW/3940UWD User’s Guide Follow these steps to select a different ID for a channel: 1 Display the Configuration menu for the channel. 2 Highlight Host Adapter SCSI ID, then press Enter. A menu of IDs appears. 3 Highlight the ID you want to assign the channel, then press Enter. When selecting the channel SCSI ID, consider the following: ■ Two devices on the same channel cannot have the same ID. The host adapter itself uses one SCSI ID on each channel (SCSI ID 7, by default).
Configuring Your Host Adapter 2 Highlight SCSI Parity Checking, then press Enter. The pop-up menu shown in Figure 3-6 appears. Adaptec AHA-3940 Ultra/Ultra Wide SCSISelect(TM) Utility v1.22 AHA-3940 Ultra/Ultra W at Bus:Channel 01:A Configuration SCSI Channel Interface Definitions Host Adapter SCSI ID ........................................ 7 SCSI Parity Checking ........................................ Enabled Host Adapter SCSI Termination ........................
AHA-3940U/3940UW/3940UWD User’s Guide To change the termination setting manually for a given channel: 1 2 Display the Configuration menu for the channel. Highlight Host Adapter SCSI Termination, then press Enter. A pop-up menu appears, as shown in Figure 3-7. Adaptec AHA-3940 Ultra/Ultra W SCSISelect(TM) Utility v1.22 AHA-3940 Ultra/Ultra W at Bus:Channel 01:A Configuration SCSI Channel Interface Definitions Host Adapter SCSI ID .....................................7 Automatic * ......................
Configuring Your Host Adapter Boot Channel MultiChannel devices allow you to boot from either channel. Use this option to identify the channel which should be scanned first during bootup. The default is A First. Boot Target ID This option allows you to identify the SCSI device to be used as a boot device. The range is 0 to 15; the default is 0. Boot LUN Number The AHA-3940U/3940UW/3940UWD supports up to eight logical units.
AHA-3940U/3940UW/3940UWD User’s Guide The screen has a column of information for each SCSI ID, including SCSI IDs that are not assigned to a device. To configure a specific SCSI device, you need to know its SCSI ID. See SCSI Disk Utilities on page 3-18 to learn how to determine the SCSI ID for each device. To change a setting, use the arrow keys (↑↓) to highlight the setting, then press Enter to display a pop-up menu of choices. Use the arrow keys (↑↓) to highlight a choice, and press Enter to select it.
Configuring Your Host Adapter SCSISelect Transfer Rate (MBytes/sec) AHA-3940U Effective Transfer Rate (MBytes/sec) AHA-3940UW/AHA-3940UWD Effective Transfer Rate (MBytes/sec) 20.0 20.0 40.0 10.0 10.0 20 8.0 8.0 16 6.7 6.7 13.4 5.0 5.0 10.0 In most cases, you can use the maximum value of 20.0. If Initiate Sync Negotiation is set to no for the device, then the value selected here is the maximum rate that the channel accepts from the device during negotiation.
AHA-3940U/3940UW/3940UWD User’s Guide Initiate Wide Negotiation This setting, which appears only on AHA-3940UW/3940UWD host adapters, determines whether the channel initiates negotiation with the SCSI device for Wide SCSI data transfers. When set to yes for a SCSI device, the channel initiates Wide negotiation with the SCSI device. When set to no, the channel does not initiate Wide negotiation with the device. The channel, however, always responds to Wide negotiation if the SCSI device initiates it.
Configuring Your Host Adapter Include In BIOS Scan During boot-up, the host adapter scans all devices looking for the boot device. This option allows you to include or exclude devices from this scan. It may be desirable to exclude certain non-boot devices from this scan in order to improve boot-up time. The boot device must not be excluded, otherwise your system will not boot. Advanced Configuration Options When you select Advanced Configuration Options, a screen similar to Figure 3-10 appears.
AHA-3940U/3940UW/3940UWD User’s Guide adapter has one BIOS, which operates on both SCSI channels. The BIOS must be enabled if you want the computer to boot from a SCSI hard disk drive connected to either channel of the host adapter. Several SCSISelect options are only valid if the host adapter BIOS is enabled, as noted in the table on page 3-2. Note: You can only change the Host Adapter BIOS setting when you are configuring SCSI Channel A.
Configuring Your Host Adapter Extended BIOS Translation for DOS Drives > 1 GByte This setting enables or disables extended translation for SCSI hard disks with a capacity greater than 1 GByte. The setting is valid only if the channel BIOS is enabled. The default setting is Enabled. If extended translation is enabled, the following translation schemes are used: ■ ■ SCSI hard disks ≤ 1 GByte use a translation scheme of 64 heads, 32 sectors per track.
AHA-3940U/3940UW/3940UWD User’s Guide the changes or No to abandon them. If you select Yes, the system saves the changes and reboots with the new initial values. SCSI Disk Utilities When you select SCSI Disk Utilities from the Options menu, SCSISelect scans the SCSI bus and lists all installed SCSI devices. A screen similar to Figure 3-11 appears, listing the SCSI ID assigned to each device on the SCSI bus. Adaptec AHA-3940 Ultra/Ultra W SCSISelect(TM) Utility v1.
Configuring Your Host Adapter Caution: A low-level format destroys all data on the drive. Back up your data before performing this operation. You cannot abort a low-level format once it starts. Verify Disk Media The Verify Disk Media utility scans the selected device’s media for defects. If the utility finds bad blocks, it prompts you to reassign them; if you select yes, those blocks will no longer be used. Note: You can press Esc at any time to abort the Verify Disk Media utility.
AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
▼ ▼ ▼ ▼ 4 Operating System Support The Adaptec AHA-3940U/3940UW/3940UWD host adapter kit includes two software packages for managing devices. If your system runs on Windows or DOS, install the EZ-SCSI software. If your system runs on NetWare, OS/2, SCO UNIX, or UnixWare, install the Adaptec 7800 Family Manager.
AHA-3940U/3940UW/3940UWD User’s Guide ■ Audio CD-ROM player utility ■ Scanner utility ■ Utilities for viewing Photo CD images, writing to CD-ROMs, and more To install support for SCSI devices such as optical disks, check the hardware documentation for those devices. For details on how to install and use EZ-SCSI software, refer to the Adaptec EZ-SCSI 4.0 Software Quick Reference Guide, included in the AHA-3940U/3940UW/3940UWD package.
▼ ▼ ▼ ▼ 5 Troubleshooting AHA-3940U/3940UW/3940UWD host adapters have been tested for compatibility with a wide range of SCSI devices. Most problems that occur during installation result from errors in preparing and connecting devices on the SCSI bus. If you need more assistance after reading this troubleshooting information, see Adaptec Technical Support and Services on page ii.
AHA-3940U/3940UW/3940UWD User’s Guide adapter. But you may need to assign some of these values manually in the Setup program. ■ Is the host adapter’s IRQ or port address in conflict with any SCSI ID? Again, the PCI bus assigns IRQ, port address, and BIOS address settings automatically, but you may need to assign some of these values manually in Setup. ■ Is each SCSI device, including the channel, set to a unique SCSI ID? (See SCSI IDs on page 2-14.
Troubleshooting Time-out failure during SCSI Inquiry command! or Time-out failure during SCSI Test Unit Ready command! or Time-out failure during Start Unit command! An unexpected time-out occurred. Check SCSI bus termination. Try disconnecting the SCSI peripheral cables from the channel and then starting the computer. If the computer starts successfully, check SCSI bus termination and cable connections. One of the devices on the SCSI bus could be defective. Host adapter configuration error.
AHA-3940U/3940UW/3940UWD User’s Guide always scans Channel A first.) See Boot Device Options on page 3-10 for more information. ■ Check that there are no SCSI ID conflicts. Refer to the disk drive manual to learn how to set the drive’s SCSI ID. You can use SCSISelect to determine the SCSI IDs of devices on the SCSI bus, as described on page 3-18. ■ Be sure that SCSI Parity Checking is consistently enabled or disabled on all devices on the SCSI bus. See SCSI Parity Checking on page 3-8.
Troubleshooting Using SCSI Drives as C and D ■ Make sure your computer's CMOS Setup program is set to No Drives Installed. ■ The drive with the lowest SCSI ID is automatically used for boot-up. Refer to the disk drive manual to learn how to set the drive’s SCSI ID. You can also use SCSISelect to specify the bootup drive; see page 3-18. ■ Always turn the computer’s power OFF and ON after changing any values on a channel, in a Setup program, or on a SCSI device.
AHA-3940U/3940UW/3940UWD User’s Guide Other Problems and Solutions The screen is difficult to read when I run SCSISelect. Press F5 to toggle the display between color and monochrome modes. This may make it easier for you to read the screen. When I tried to use the format/verify utility on a disk device, I got an Unexpected SCSI Command Failure pop-up box with a lot of error information.
Troubleshooting ■ 06h - Unit attention The removable medium may be write-protected. Disable write protection and run the utility again. The Additional Sense Code field provides more information about the error. Check your hardware manual for explanations. My computer locks up when I press Esc to exit SCSISelect. If this happens, turn your computer OFF and then ON to reboot. Any settings you changed before you tried to exit the program were recorded in the EEPROM and are not lost.
AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
▼ ▼ ▼ ▼ A Multiple Computer Configuration Normally your AHA-3940U/3940UW/3940UWD SCSI bus configuration includes one host adapter installed in one computer, with one or more internal and/or external SCSI devices attached to each channel on the host adapter. However, two computers can share SCSI devices without changing the cable configuration every time one of the computers needs access to the devices.
AHA-3940U/3940UW/3940UWD User’s Guide AHA-3940U/3940UW/3940UWD Computer 1 Other SCSI Host Adapter Computer 2 Figure A-1. SCSI Devices Shared by Two Computers ■ Only external SCSI peripherals can be attached to the bus between the two host adapters. Devices cannot be shared if you have CD-ROM or internal SCSI drives, for example, in either computer.
▼ ▼ ▼ ▼ B Optimizing Performance Read this appendix to find out how to optimize your computer’s performance and take full advantage of the AHA-3940U/3940UW/ 3940UWD advanced design features. Enabling Synchronous Negotiation Synchronous negotiation is a SCSI feature that allows the SCSI channel and its attached SCSI peripheral devices to negotiate for the transfer of data in synchronous mode on the SCSI bus. Synchronous data transfer is faster than asynchronous data transfer.
AHA-3940U/3940UW/3940UWD User’s Guide Enabling Wide Negotiation Wide Negotiation is enabled (set to yes) by default on the AHA-3940U/3940UW/3940UWD. For each 16-bit SCSI device connected to the host adapter, Wide Negotiation should normally be enabled to allow for 16-bit data transfer instead of 8-bit. See SCSI Device Configuration on page 3-11.
Optimizing Performance Enabling Send Start Unit Command This option, which is supported by some SCSI devices, reduces the load on your computer's power supply by allowing the channel to turn on disk devices and other peripherals one-at-a-time when the computer boots. Otherwise, all peripherals turn ON at the same time. Send Start Unit Command is Disabled (set to no) by default. Check your hardware documentation before you enable (set to yes) this option, to make sure your devices support it.
AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
▼ ▼ ▼ ▼ C Disk Drives Over 1 GByte Extended Translation (Using MS-DOS 5.0) Adaptec host adapters have always supported the full range of disk drive capacities under all major operating systems. As disk drives have recently grown beyond 1 GByte in formatted capacity, they have run up against the DOS 1024-cylinder limit. To continue its support for all SCSI disk drive capacities under DOS, Adaptec has included an extended translation scheme for AHA-3940U/3940UW/3940UWD host adapters.
AHA-3940U/3940UW/3940UWD User’s Guide Caution: Be sure to back up your disk drive before you change the translation method on a disk drive. All data is erased when you change from one translation scheme to another. When Not to Use Extended Translation ■ NetWare and the newer versions of UNIX do not share the 1024 cylinder limit of DOS and do not require extended translation to support large disk drives. ■ Drives are sometimes formatted with two or more partitions for different operating systems.
▼ ▼ ▼ ▼ A Active Termination A-2 Adaptec 7800 Family Manager 4-2 Adaptec EZ-SCSI 4-1 Adaptec Services information 1-8 support 1-8 Advanced Configuration Options 3-15 Advisories 1-7 AHA-3940U/3940UW/3940UWD applications support 1-5 default values 3-2 explanation of 1-2 features 1-2–1-5 jumper A-1 multiple device support 1-5 multiple host adapters 3-4, 3-19 termination 3-9 Asynchronous Data Transfer 3-12 B Bernoulli 4-1 BIOS, Host Adapter 1-5 base address 3-15 disabling B-2 enabling 3-15, B-2 extended trans
AHA-3940U/3940UW/3940UWD User’s Guide External SCSI Device, using with multiple computers A-2 EZ-SCSI see Adaptec EZ-SCSI L LED Cable 2-15, 5-7 LED Connector 2-15 Logical Units, Support for Multiple 1-5 F Fast SCSI 3-13 Fdisk command C-2 Floptical 4-1 Format Disk Utility 3-18 Format, low-level 3-18 Low-level Format 3-18 M Multiple Host Adapters 3-4, 3-19 Multithreaded I/O 1-2 H Hard Disk Drive See Also SCSI Drive configuration problems 5-3–5-5 DOS disk capacity limit C-1 extended translation 3-16, C-1
Index S T Scatter/Gather 1-2 SCSI Bus disconnect/reconnect 3-13 parity checking 3-8, B-2 SCSI ID 3-7 termination of 2-12, 5-2 SCSI Cables, characteristics of 2-5 SCSI Command Failure 5-6 SCSI Device Configuration 3-11– 3-17 SCSI Disk Utilities 3-18 SCSI Drive, Booting from 5-3 SCSI ID for AHA-3940U/3940UW/ 3940UWD 3-7 conflicts with 5-4 for peripheral devices 3-12 purpose of 2-14 setting 2-14 SCSI single-ended devices 2-6 SCSI-2, implementation of 1-4 SCSISelect 1-3 Advanced Configuration Options 3-15 Co
AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.
