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                                         OS2.TXT
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Installation Guide for the LSI Logic SDMS OS/2 DRIVERS:

SYM8XX.ADD V4.11.00 and SYM_HI.ADD V4.11.00

Introduction
  Features 
  Description 
  LSI Logic Devices Supported
  Preparing an SDMS OS/2 Driver Diskette
Installing Your SDMS OS/2 Drivers
Driver Order in the CONFIG.SYS File
Command Line Options
Troubleshooting


*******************************  Introduction  ********************************

The OS/2 operating system version 4.0 or later provides an integrated platform 
featuring the Presentation Manager graphical windowing interface that allows 
multiple applications to be viewed at the same time. Multitasking is also 
supported, enabling several different programs to run at the same time in 
different windows. Presentation Manager allows the user to switch between 
programs, start other programs, and maintain files and directories.

This version of OS/2 requires an 80386 or higher microprocessor. Other hardware
requirements include a minimum of 8 Mbytes of RAM and a minimum hard disk drive
size of 90 Mbytes. SDMS 4.0 provides the necessary SCSI device drivers for OS/2:
SYM8XX.ADD and SYM_HI.ADD. LSI Logic recommends reviewing the OS/2 manual prior
to proceeding.


* *  *  *  *  *  *  *  *  *  *  *  *  Features  *  *  *  *  *  *  *  *  *  *  *

The SDMS device drivers for OS/2 support these features:

o  Synchronous negotiation (including Fast SCSI/Ultra SCSI/Ultra2 SCSI) 
o  Wide SCSI (single-ended and differential) 
o  Multiple host adapters 
o  Disconnect/Reselect 
o  Scatter/Gather 
o  Tagged command queuing 
o  Single-ended, differential, and low-voltage differential termination   
o  Target-initiated negotiation 
o  Allow up to 8 host adapters
o  NVRAM/NVS configuration storage
o  Alternate CHS (Cylinder Head Sector) mapping algorithm
o  Command line /EXCLUDE option to block use of a specified adapter
o  Higher performance by requiring only one interrupt per I/O
o  Flexible GPIO pin definition using a table in the manufacturing
   data area of NVM


*  *  *  *  *  *  *  *  *  *  *  * Description  *  *  *  *  *  *  *  *  *  *  *

Although the LSI Logic SCSI controller's firmware can access the SCSI hard disk
drives attached to the computer independently, the SCSI device drivers
SYM8XX.ADD and SYM_HI.ADD act as an enhanced interface between the computer
system and the SCSI BIOS firmware. Use of the device drivers increases the
abilities of the SCSI controller firmware and fully utilizes the advancements
and improvements of Pentium-based and higher microprocessors.

The device drivers are also necessary to support the use of SCSI tape drives
and CD-ROM drives with an OS/2 system. The SYM8XX.ADD and SYM_HI.ADD device 
drivers are written in compliance with the IBM OS/2 ADD (Adapter Device Driver)
specification, and the device drivers work with third party applications that 
comply with the same specification.

Both the SYM8XX.ADD V4.11.00 and SYM_HI.ADD V4.11.00 drivers allow up to eight
host adapters to be present in your system. The first four host adapters are 
accessed in the order you specify using the SCSI BIOS Configuration Utility 
provided with some members of the LSI Logic family of host adapters. Refer to
the PCI Storage Device Management System SDMS 4.0 User's Guide on the availability
and use of the SCSI BIOS Configuration Utility. Remaining host adapters are accessed
based on their physical position in your system. Refer to your system documentation
for further information.


*  *  *  *  *  *  *  *  LSI Logic Devices Supported  *  *  *  *  *  *  *  * 

The SYM8XX.ADD driver supports the following devices and their associated
LSI Logic host adapters:

SYM53C810, SYM53C810A, SYM53C810AE (SYM8100S, SYM8100ASP, SYM20810) 
SYM53C815  (SYM815XS, SYM8150SP) 
SYM53C825, SYM53C825A (SYM8250S, SYM8251S, SYM8251D, SYM8250ASP, 
                       SYM8251ASP, SYM8251AD) 
SYM53C860, SYM53C860AE (SYM8600SP, SYM20860) 
SYM53C875, SYM53C875E (SYM8750SP, SYM8751SP, SYM8751SPE, SYM8751D) 
SYM53C876  (SYM22801, SYM22802) 
SYM53C885 
SYM53C895  (SYM8951U, SYM8952U)
SYM53C895A (SYM8953U)

The SYM_HI.ADD driver supports the following devices and their associated
LSI Logic host adapters:

o SYM53C895A (SYM8953U)
o SYM53C896  (SYM22910, SYM21002, SYM22902)
o SYM53C1010 (SYM8955U, SYM22915, SYM21040, SYM22903)

Note:  Both the SYM8XX.ADD and SYM_HI.ADD drivers support the SYM53C895A 
chip. If both drivers have been installed, whichever driver appears first in 
the CONFIG.SYS file will control the SYM53C895A chip. Refer to the section 
"Driver Order in the CONFIG.SYS File" in this document to understand the 
importance of driver order.


*  *  *  *  *  *  *  Preparing an SDMS OS/2 Driver Diskette *  *  *  *  *  *  *  

You must prepare a driver diskette to contain the OS/2 driver files for 
device driver installation purposes. You can obtain these files from
the LSI Logic web site at http://www.lsilogic.com. After connecting to 
this web site, follow these steps:

1. Click on the Support option in the menu bar.

2. Go to the "Software and drivers for Symbios brand PCI host adapters" 
   section.

3. Choose the operating system or utility desired. 

4. Click on the Go button.

   Based on your selection, you will either:

   A. Download the driver or utility from the next screen.

      -or-

   B. Select the chipset or model number of the host adapter card, then
      download the appropriate driver based on the selection made. 


The SDMS OS/2 driver diskette will contain eight files: 

o Device drivers SYM8XX.ADD and SYM_HI.ADD,
o Text files SYM8XX.DDP and SYM_HI.DDP,
o Executable files SYM8XXPC.EXE and SYM_HIPC.EXE, and
o A copy of this file, OS2.TXT, and a licensing agreement, LEGAL.TXT. 

When the device driver installation utility under OS/2 is activated, it looks 
for all files with the DDP extension. The DDP files contain the necessary 
information to install SCSI device drivers. The EXE files contain a utility 
that verifies that an appropriate adapter is present. If you do not wish to 
install both device drivers, create a diskette containing the appropriate 
driver, DDP file, and EXE file to use instead of the SDMS OS/2 driver diskette.


************************* Installing Your SDMS OS/2 Drivers ********************

This section provides instructions on:

Installing SYM8XX.ADD/SYM_HI.ADD During New System Installations
Updating SYM8XX.ADD/SYM_HI.ADD For Existing System Installations

These installation instructions are specific and accurate for the SDMS OS/2 
SYM8XX.ADD V4.11.00 and SYM_HI.ADD V4.11.00 drivers. Refer to the text file 
OS2.TXT that came with your driver for a version of these instructions 
guaranteed to match your driver.

Note: If you previously installed OS2CAM.ADD (a previous version of the 
      SYM8XX.ADD driver), delete OS2CAM.ADD and the corresponding BASEDEV= 
      statement in the CONFIG.SYS file after you complete the installation 
      procedures. If you previously installed SYM8XX.ADD and/or SYM_HI.ADD 
      in a directory other than \OS2\BOOT, move SYM8XX.ADD and/or SYM_HI.ADD 
      to \OS2\BOOT, where the new versions of these drivers can replace the 
      old versions. The system will continue to boot using the previous drivers 
      until these steps are taken.


*  *   Installing SYM8XX.ADD/SYM_HI.ADD During New System Installations *  *  

Your system configuration determines which installation instructions are 
appropriate for you. 

If neither your boot drive nor SCSI CD-ROM is connected to an LSI Logic host
adapter, install OS/2 and then add the drivers. Refer to the OS/2 Installation
Guide for installing the operating system. Follow the steps in "Updating
SYM8XX.ADD/SYM_HI.ADD For Existing System Installations" to add the drivers. 

-or-

If your boot drive or SCSI CD-ROM is attached to an LSI Logic host adapter, 
follow these steps:

1. Make copies of the diskettes used for installation that are included
   with the CD-ROM version of OS/2.

2. Determine the appropriate driver for installation by locating the host
   adapter to which the CD-ROM and/or boot drive is attached in the section
   of this document titled "LSI Logic Devices Supported." 

3. Copy the indicated driver(s) from the SDMS OS/2 driver diskette to the copy
   of Diskette 1. 

   In order to do so, you must delete files on Diskette 1 to provide space.
   Consult the README.1ST file on the Device Driver Pak. It contains a list of
   files that may not be deleted. Follow the instructions provided in the
   README.1ST file. Once space is made available on Diskette 1, copy the
   appropriate SDMS device driver(s) onto this diskette. 

   When ADD drivers are deleted from Diskette 1, make certain to delete or 
   remark out the corresponding BASEDEV= statement in the CONFIG.SYS file.
   Otherwise, error messages will show up during installation.

4. Edit the CONFIG.SYS file on the copy of Diskette 1 by adding one or both of
   the following lines at the end of the file:

   BASEDEV=SYM8XX.ADD /V 

   and/or

   BASEDEV=SYM_HI.ADD /V

   If installing both drivers, make sure that the BASEDEV= lines for the 
   drivers appear in the CONFIG.SYS file in the order in which the drivers
   must load. Refer to the section "Driver Order in the CONFIG.SYS File" in 
   this document to understand the importance of driver order. 

5. Follow the directions in the README.1ST file for adding the following line
   to the CONFIG.SYS file:

   SET COPYFROMFLOPPY=1

   This allows the SDMS driver(s) to be copied from the installation diskette
   to the system's boot drive.

6. Place the copy of Installation Diskette in the A: drive and reboot the 
   computer.

7. Proceed with the OS/2 installation process as documented in the OS/2
   Installation Guide.


*  *   Updating SYM8XX.ADD/SYM_HI.ADD For Existing System Installations *  *  

This section provides instructions for existing system installations. Apply 
these instructions when you have to: 

o Add drivers for newly installed LSI Logic host adapters, or
o Update drivers for existing LSI Logic host adapters.  

To add or update SDMS OS/2 drivers, follow these steps:

1. Open the System Setup folder located within the OS/2 System folder on the
   OS/2 Desktop. 

2. Open the Install/Remove folder and then double click on the Device Driver 
   Install icon.

3. Insert the diskette containing the SDMS device driver(s) in the source
   drive. 

   The system will find all DDP files on the floppy diskette and automatically 
   install the corresponding drivers.

4. Verify that the installation was successful by following these steps:

   A. Open the Utilities folder located within the Programs folder on the OS/2
      Desktop.  

   B. Double click on the OS/2 System Editor to start the editor. 

   C. Open the CONFIG.SYS file in the root directory and find the line(s): 

      BASEDEV=SYM8XX.ADD /V

      and/or

      BASEDEV=SYM_HI.ADD /V

      If installing both drivers, make sure that the BASEDEV= lines for the
      drivers appear in the CONFIG.SYS file in the order in which the drivers
      must load. Refer to the section "Driver Order in the CONFIG.SYS File" in 
      this document to understand the importance of driver order. 

   D. Check that the appropriate drivers are in the \OS2\BOOT directory on the
      boot drive.


*  *  *  *  *  *  *  *  Driver Order in the CONFIG.SYS File *  *  *  *  *  *  * 

Because of the way OS/2 assigns drive letters, the order in which drivers
appear in the CONFIG.SYS file is important. The drivers must appear in the
order in which the drive letters are to be assigned. In particular:

o   OS/2 will install the BASEDEV= line at the beginning of the target
    system's CONFIG.SYS file regardless of where the line is located in that
    file on Diskette 1. You may need to rearrange the order in which drivers 
    appear in the CONFIG.SYS file for the target system. 

o   The driver for the host adapter to which the boot device is attached must 
    appear before all other BASEDEV= drivers in the CONFIG.SYS file.

o   If you are installing both SDMS drivers and a host adapter containing the
    SYM53C895A chip, the driver that will control that host adapter will be the 
    driver that appears first in the CONFIG.SYS file. If one of the two SDMS 
    drivers is controlling the boot drive, that driver will also control the 
    SYM53C895A chip, since it must appear first in order for the boot drive to be 
    recognized.

Refer to the OS/2 documentation to fully understand this requirement. 


*  *  *  *  *  *  *  *  * Command Line Options *  *  *  *  *  *  *  *  * 

Using the /VERBOSE Option
Using the /!DM Option
Using the /!SM Option
Using the /EXCLUDE Option
Using the /SYNCH_RATE Option
Using the /SYNCH_OFFSET Option
Using the /TIMEOUT Option
Using the /DISCONNECT Option
Using the /PARITY Option
Using the /QTAG Option
Using the /WIDTH Option

Your host adapter has a default configuration that consists of optimal values
for operation. You may decide to alter these default values if there is a
conflict between device settings or if you need to optimize system performance.
Some values may be changed using the SCSI BIOS Configuration Utility provided
with some members of the LSI Logic family of host adapters. Refer to the PCI
Storage Device Management System SDMS 4.0 User's Guide for information on the
availability and use of the SCSI BIOS Configuration Utility. In addition, the
SDMS OS/2 device drivers have several embedded functions that can be accessed
by using switches on the command line in the CONFIG.SYS file. 

Note: Values are applied in the following order:

      o Manufacturer's settings 
      o SCSI BIOS Configuration Utility changes 
      o Command line options 

      When applying new values using the command line options, changes
      in synchronous and wide negotiations may only decrease speed or
      reduce width. Any changes that attempt to increase speed or width
      will be ignored.

The options available using command line switches are described below. The
SYM8XX.ADD driver is used in all examples; SYM_HI.ADD may be substituted for
SYM8XX.ADD with identical results.

The following conventions are used:

The term "hba" represents the logical number of a host adapter as displayed by 
the Verbose option in the column headed HBA. This is not the SCSI ID of the host 
adapter. Use an hba value with no id following it to indicate all devices on 
an adapter.

The term "id" represents a SCSI target ID on the indicated adapter. To indicate
all devices on a host adapter, do not use the SCSI ID of the host adapter for
the id value. Instead, use the hba value as indicated in the preceding
paragraph.

[ ] indicates optional information

 *  indicates the pattern enclosed in the [ ] may be repeated


*   *   * Using the /VERBOSE (or /V) Option *   *   *

This option appears on the command line by default. It enables display of a
banner, version number, and SCSI bus information during startup of the system. 

Usage: /VERBOSE

For example, to see more detailed information displayed when you boot, the line
in the CONFIG.SYS file that loads SYM8XX.ADD should look like this:

       BASEDEV=SYM8XX.ADD /VERBOSE
       
       or
       
       BASEDEV=SYM8XX.ADD /V

To disable this feature, remove this switch from the command line.


*   *   * Using the /!DM Option *   *   *

This option disables use of the IBM-supplied DASD manager (OS2DASD.DMD) for the
devices listed. The DASD manager supports direct access devices such as hard
drives.

Usage: /!DM<hba[:id]>[,<hba[:id]>]*

For example, to disable OS2DASD.DMD for devices on host adapter 0 at target
IDs 3 and 5, the line in the CONFIG.SYS file that loads SYM8XX.ADD should look
like this:

       BASEDEV=SYM8XX.ADD /!DM<0:3>,<0:5>

*   *   * Using the /!SM Option *   *   * 

This option disables use of the IBM-supplied SCSI manager (OS2SCSI.DMD) for the
devices listed. The SCSI manager supports SCSI tape drives.

Usage: /!SM<hba[:id]>[,<hba[:id]>]*

For example, to disable OS2SCSI.DMD for devices on host adapter 0 at target IDs
3 and 5, the line in the CONFIG.SYS file that loads SYM8XX.ADD should look like
this:

       BASEDEV=SYM8XX.ADD /!SM<0:3>,<0:5>

*   *   * Using the /EXCLUDE (or /X) Option *   *   *

This option disables a host adapter so that it is not seen by the SDMS OS/2
device drivers. This allows a host adapter to be ignored without physically
removing the board from the system. This may be necessary if the adapter in
question is causing a resource conflict.

Note: If you exclude the adapter to which the boot device is attached, then
      you will not be able to boot.

Usage: /EXCLUDE<chip:bus:dev/func>[,<chip:bus:dev/func>]*

Where:
       chip is a unique identifier that indicates the LSI Logic board type. The
       Verbose option displays a table with this value appearing in the "CHIP"
       column.

       bus represents the PCI bus number into which the adapter is plugged. The
       Verbose option displays a table with this value appearing in the "BUS" 
       column. 

       dev/func is the number derived by combining the PCI device and function
       numbers and serves as a unique board identifier in conjunction with
       the PCI bus. The Verbose option displays a table with this hexadecimal
       value appearing in the "DEV/FUNC" column. It may contain an A, B, C, D,
       E, or F as part of its value. 

For example, to exclude a host adapter with chip type F, PCI bus number 0 
and dev/func number A0, the line in the CONFIG.SYS file that loads SYM8XX.ADD
should look like this:

       BASEDEV=SYM8XX.ADD /EXCLUDE<F:0:A0>
       
       or
       
       BASEDEV=SYM8XX.ADD /X<F:0:A0>


*   *   * Using the /SYNCH_RATE (or /SR) Option *   *   *

This option sets the maximum synchronous transfer rate (in Mbyte transfers per
second) to negotiate with a particular device. The allowable values for this
setting are 0, 5, 10, 20, and 40 Mbyte transfers per second, if the adapter
is capable of the specified speed. All host adapters in the LSI Logic family 
support at least 10 Mbyte transfers per second; some support 20 or 40 Mbyte 
transfers per second. To turn off synchronous transfers for a particular device,
specify 0 (zero). The value set by this option only defines the maximum transfer
rate negotiated. The actual rate also depends on the device's capability. The 
default value is the fastest transfer rate that is supported by a particular 
host adapter.

Note: The maximum synchronous transfer rates effectively double when the 
      adapter and device permit wide transfers (See the /WIDTH option).
      For example, a synchronous transfer rate setting of 40 Mbyte transfers 
      per second will actually produce a transfer rate of 80 Mbyte transfers 
      per second if the adapter and device both allow and are set to perform 
      wide transfers.

Usage: /SYNCH_RATE=n<hba[:id]>[,n<hba[:id]>]*

Where: n = 0, 5, 10, 20, or 40. 

Two examples illustrate how to use this option:

1. To turn off synchronous transfers to ID 3 on host adapter 0, the 
   line in the CONFIG.SYS file that loads SYM8XX.ADD should look like this: 

       BASEDEV=SYM8XX.ADD /SYNCH_RATE=0<0:3>

2. To set synchronous transfers to 10 Mbyte transfers per second on all devices 
   on host adapter 1, the line in the CONFIG.SYS file that loads SYM8XX.ADD 
   should look like this: 

       BASEDEV=SYM8XX.ADD /SR=10<1>


*   *   * Using the /SYNCH_OFFSET (or /SO) Option *   *   *

This option sets the maximum synchronous offset to negotiate with a particular 
device. The allowable values for this setting are 0 to the maximum synchronous 
offset supported by the specified adapter. The LSI Logic controller chips 
support offsets up to 31. Refer to your host adapter user's guide for 
information on the maximum offset supported by your host adapter. If 0 (zero) 
is specified for the synchronous offset value, synchronous transfers are turned 
off for any specified device. The value set by this option only defines the 
maximum offset that is negotiated. The resulting rate also depends on the 
device's capability. The default value is the maximum offset that is supported 
by a particular host adapter. 

Usage: /SYNCH_OFFSET=n<hba[:id]>[,n<hba[:id]>]*

Where: n = 0 up to maximum synchronous offset for the adapter. 

For example, to change the synchronous offset to 6 for ID 3 on host adapter 0, 
the line in the CONFIG.SYS file that loads SYM8XX.ADD should look like this: 

       BASEDEV=SYM8XX.ADD /SYNCH_OFFSET=6<0:3>
       
       or
       
       BASEDEV=SYM8XX.ADD /SO=6<0:3>


*   *   * Using the /TIMEOUT (or /T) Option *   *   *

The SDMS device drivers use a timeout mechanism to detect certain errors.
When the driver issues a command to a SCSI device, a timer is started. If the
timer expires before the command completes, the driver assumes that something
is wrong with the device, and takes steps to recover. The default value
for this is 10 seconds. If you set the value to be less than the system has
allocated for a particular device, your value will be ignored. To turn off the
timeout mechanism for a particular device, set the value to 0 (zero).

Usage: /TIMEOUT=n<hba[:id]>[,n<hba[:id]>]*

Where: n = timeout value in seconds for device (0-65535). 

For example, if you have a particularly slow device at ID 3 on host adapter 0 
and you wish to extend the timeout on this device to 60 seconds, then the line 
in the CONFIG.SYS file that loads SYM8XX.ADD should look like this: 

       BASEDEV=SYM8XX.ADD /TIMEOUT=60<0:3>
       
       or
       
       BASEDEV=SYM8XX.ADD /T=60<0:3>


*   *   * Using the /DISCONNECT (or /DC) Option *   *   *

SCSI devices have the ability to disconnect from the bus during an I/O 
transfer. This option allows (or does not allow) a device to disconnect during 
an I/O transfer. If a particular adapter has parity checking disabled, then you 
must use this option to disable disconnects for all devices on that adapter 
that do not generate parity. Refer to the /PARITY option for more information.

Usage: /DISCONNECT=n<hba[:id]>[,n<hba[:id]>]*

Where: n = ON is the default value for all devices, which allows disconnects.
           OFF does not allow disconnects. 

For example, to disable disconnects on the device at ID 2 on host adapter 0, 
then the line in the CONFIG.SYS file that loads SYM8XX.ADD should look like 
this:

       BASEDEV=SYM8XX.ADD /DISCONNECT=OFF<0:2>
       
       or
       
       BASEDEV=SYM8XX.ADD /DC=OFF<0:2>


*   *   * Using the /PARITY (or /P) Option *   *   *

The LSI Logic chips are capable of enabling or disabling the SCSI bus data 
integrity checking feature known as parity. Some non-compliant SCSI devices
sold as SCSI devices do not generate parity. You can use this option to disable
parity checking. The LSI Logic chips always generate parity (for outputs), but
may optionally check the parity (for inputs).  

Note: When disabling parity checking, you must disable disconnects for
      any device that does not generate parity, as the LSI Logic chips
      cannot disable parity checking for that device during the reselection
      phase. If a device does not generate parity and it disconnects, the
      I/O never completes as the reselection never completes. Refer to using
      the /DISCONNECT option for more information about disabling disconnects
      for a device. 

Usage: /PARITY=n<hba[,hba]*>[,n<hba[,hba]*>]*

Where: n = ON is the default value for all devices, which enables parity
           checking. OFF disables parity checking. 

For example, to turn off parity checking on host adapter 0, the line in the
CONFIG.SYS file that loads SYM8XX.ADD should look like this:

       BASEDEV=SYM8XX.ADD /PARITY=OFF<0>
       
       or
       
       BASEDEV=SYM8XX.ADD /P=OFF<0>


*   *   * Using the /QTAG (or /QT) Option *   *   *

Queue tagging allows more than one outstanding command per SCSI device. Some 
non-compliant SCSI devices sold as SCSI devices do not allow queue tags, in 
which case queue tagging needs to be disabled. The value given in the command 
line will be the depth of the queue for queue tags for the device(s) indicated.
To disable queue tag support, a value of 0 or 1 should be given. 

Usage: /QTAG=n<hba[:id]>[,n<hba[:id]>]*

Where: n = the number of queue tags allowed for a device (0-256). 

Two examples illustrate how to use this option: 

1. To turn off queue tagging for ID 3 on host adapter 0, the line in the 
   CONFIG.SYS file that loads SYM8XX.ADD should look like this: 

       BASEDEV=SYM8XX.ADD /QTAG=0<0:3>

2. To set the queue depth to 5 for all devices on host adapter 2, the line in
   the CONFIG.SYS file that loads SYM8XX.ADD should look like this: 

       BASEDEV=SYM8XX.ADD /QT=5<2>


*   *   * Using the /WIDTH (or /W) Option *   *   *

Devices attached to a SCSI bus are narrow or wide devices. Narrow devices 
transfer data one byte (or 8 bits) at a time. Wide devices transfer two bytes 
(or 16 bits) at a time. The value given in the command line option will 
determine the size of data transfers.

Usage: /WIDTH=n<hba[:id]>[,n<hba[:id]>]*

Where: n = 8 or 16.     

Two examples illustrate how to use this option: 

1. To have the device at ID 3 on host adapter 0 treated as a narrow device, 
   the line in the CONFIG.SYS file that loads SYM8XX.ADD should look like this: 

       BASEDEV=SYM8XX.ADD /WIDTH=8<0:3>

2. To have all devices on host adapter 2 treated as 8-bit devices, the line in 
   the CONFIG.SYS file that loads SYM8XX.ADD should look like this: 

       BASEDEV=SYM8XX.ADD /W=8<2>


******************************* Troubleshooting *******************************

Some potential problems and their suggested solutions are:

Problem: You cannot access the SCSI device(s). 

    Solution:

    a. Make sure the SCSI device driver is installed properly.

    b. Make sure each device has power.

    c. Verify that the appropriate BASEDEV= line (BASEDEV=SYM8XX.ADD /V 
       or BASEDEV=SYM_HI.ADD /V) exists in the CONFIG.SYS file. 

    d. Check the ordering of BASEDEV= entries in the CONFIG.SYS file to be
       sure that the boot device is loaded first.

    e. Verify that the correct driver is in the appropriate directory
       (\OS2\BOOT).

    f. Check the cable connections and the host adapter installation.

    g. Verify that the adapter is not turned off in the SCSI BIOS Configuration
       Utility and that the adapter is not excluded using the /EXCLUDE command 
       line option.

Problem: The computer hangs or locks up when booting and the SCSI devices
         attached are not seen by the computer system.

    Solution:

    a. Make sure that all the SCSI devices are configured at different ID 
       numbers. If booting the system from a device on the SCSI bus, the boot
       drive must have the lowest ID or the highest ID, depending on the scan
       order option selected in the SCSI BIOS Configuration Utility.

    b. Make sure both, but only, the ends of the SCSI bus are terminated.

    c. Make sure the device driver is listed in the CONFIG.SYS file and loads
       when the system boots.

Problem: The device driver does not see one of the SCSI devices.

    Solution:

    a. Make sure the SCSI devices have different ID numbers.
 
    b. Make sure both, but only, the ends of the SCSI bus are terminated.
 
    c. Check the cable and power connections.

    d. Check the ordering of BASEDEV= entries in the CONFIG.SYS file to be sure
       that the boot device is loaded first.

    e. Verify that the adapter is not turned off in the SCSI BIOS Configuration
       Utility and that the adapter is not excluded using the /EXCLUDE command
       line option.

    f. Reboot the computer.

Problem: OS/2 attempts to install to or boot from an IDE drive instead of 
         the SCSI drive.

    Solution:

     The system BIOS finds the IDE drive before it finds the SCSI drive, and
     therefore uses the IDE drive as the boot device.

    a.  Check that the appropriate BASEDEV= line (BASEDEV=SYM8XX.ADD /V or 
        BASEDEV=SYM_HI.ADD /V) appears first in the CONFIG.SYS file.

    b.  Disable the IDE drive in the CMOS setup.

    c.  On some hardware platforms, the IDE drive must be physically disconnected
        before installing to a SCSI drive.

Problem: The following message appears at bootup: 

           "OS/2 is unable to operate your hard disk or diskette drive.
            The system is stopped. Correct the preceding error and restart
            the system."

    Solution:

    a. This problem occurs when the system is booting from a hard drive attached
       to an IDE bus, a SCSI disk is attached to the LSI Logic host adapter, and
       the SDMS BASEDEV= line (BASEDEV=SYM8XX.ADD /V or BASEDEV=SYM_HI.ADD /V)
       appears in the CONFIG.SYS file before the IDE device driver statement.

       -or-

       This problem occurs when the system is booting from a hard drive attached
       to the LSI Logic adapter, an IDE drive is in the system, and the IDE
       BASEDEV= line appears in the CONFIG.SYS file before the SDMS BASEDEV=
       line (BASEDEV=SYM8XX.ADD /V or BASEDEV=SYM_HI.ADD /V).

      b. Boot the system using the floppy drive and installation diskettes to
         the F3=Command Prompt screen. Use the TEDIT.EXE editor to edit the 
         CONFIG.SYS file. Move the BASEDEV= statements to be in the appropriate
         order for the system's configuration.

      c. Restart your system. 

