Dear SCO Customer,

Support Level Supplement (SLS) ptf7049i, the Adaptec adsl HBA Supplement,
addresses these problems:

SLS ptf7049f addressed the following issues:

  - The adsl driver hangs in adsl_getblk under heavy disk I/O.

  - Failover of the OSR5000 controller causes an ODM mirror break.
    After this occurs, the rebuild time is exceptionally long.

  - Performing an mccntl -l command causes a panic with adsl.

  - The performance of ARCserve tape operations is poor on systems
    using an adsl HBA to control the tape unit.

  - On some tape devices it may not be possible to restore data
    from a backup created by ARCserve.

  - Performance is poor using Quad controller (4944W).

  - Data Overrun/Underrun errors occur.

  - The tape drive is not recognized after upgrading to SCO UnixWare 
    Release 2.1.3.

  - These error messages occur:

      WARNING: adsl: Data Overrun or Underrun [C1007024]
      (ha/targetID/lun 0/5/0)

      WARNING: (adsl, 2) Adaptec PCI SCSI: C1, SDI registry
      failure -157


SLS ptf7049g addressed the following issue:

  - The adsl driver as supplied in ptf7049f had a timeout problem.


SLS ptf7049i additionally addresses the following issue:

  - The system hangs or panics using the Adaptec 3944 dual channel 
    differential SCSI HBA.


Software Notes and Recommendations
----------------------------------

SLS ptf7049i should only be installed on:

        SCO UnixWare Application Server Release 2.1.0, 2.1.1, 2.1.2, 2.1.3
        SCO UnixWare Personal Edition Release 2.1.0, 2.1.1, 2.1.2, 2.1.3
        UnixWare 7 Release 7.0.0, 7.0.1, 7.1.0, 7.1.1

SLS ptf7049i supersedes all versions of SLS ptf3124 and all previous 
versions of ptf7049.


Installation Instructions
-------------------------

When using SLS ptf7049i as an additional HBA diskette during an operating 
system installation, be sure to insert this diskette _before_ any other 
HBA diskettes.  It should be inserted before the distribution HBA diskette,
even if the on-screen instructions seem to indicate otherwise.

1. Become root and create a new directory:
 
        $ su
        Password: <type your root password>
        # mkdir /tmp/pkg
        # chmod 700 /tmp/pkg
        # cd /tmp/pkg

2. Download the ptf7049i.hba.adsl.dd.Z file to the newly created 
   /tmp/pkg directory on your machine.
 
3. Uncompress the file, make a floppy image of the file and add the 
   SLS package to your system:
 
        # uncompress /tmp/pkg/ptf7049i.hba.adsl.dd.Z
        # dd if=ptf7049i.hba.adsl.dd of=/dev/dsk/f0t
        # pkgadd -d /dev/dsk/f0t

4. Reboot the system after installing this SLS package.


Removal Instructions
--------------------

1. As root, remove the SLS package using these commands:

        $ su
        Password: <type your root password>
        # pkgrm adsl

2. Reboot the system after removing this SLS package.


If you have questions regarding this SLS, or the product on which 
it is installed, please contact your software supplier.