TECHNICAL INFORMATION DOCUMENT

TITLE:              PTF121 - Up to 32 CD-ROM Drives Now Supported
DOCUMENT ID:        TID015314
DOCUMENT REVISION:  C
DATE:               25JAN95
ALERT STATUS:       Yellow
INFORMATION TYPE:   Symptom Solution
README FOR:         PTF121

PRODUCT and VERSION:
UnixWare 1.0
UnixWare 1.1

ABSTRACT:

ptf121 allows support up to 32 CD-ROM drives that have been installed.  
This patch removes a limitation in the CD-ROM device driver that only 
allowed 8 CD-ROM drives to be used. This patch requires UnixWare v1.1.1
( UnixWare 1.1 with update 1.1.1 applied ). If you have not applied 
update 1.1.1 it is available in the file upd111.                 

SYMPTOM

Only 8 CD-ROM devices are supported by UnixWare.

SOLUTION

Apply the ptf121 file.

Installation Instructions:

DATATYPE: datastream

1.  Download the ptf121.Z and the ptf121.txt files to the /tmp directory
    on your machine.

2.  Read the release notes contained in this file.            

3.  Now become root, uncompress the file and add the package to your 
    system using the following commands:

     $su
     #uncompress /tmp/ptf121.Z
     #pkgadd -d /tmp/ptf121 ptf121

Solution Specifics:

RELEASE NOTES

1.General Description

This patch installs updates for the SCSI CD-ROM device driver (sc01) 
and the SCSI Device Interface Host Adapter driver (sdi) to allow up to 
32 CD-ROM drives to be attached to the system.

Previous to the installation of this patch, the number of CD-ROM drives 
that could be supported was limited to a maximum of 8; therefore, 
when attempting to use more than 8 CD-ROM drives, I/O requests intended 
for the higher-numbered drives would be erroneously directed to one of 
the first 8 (for example, requests for the ninth drive would be directed 
to the first), corrupting the file system(s).

2.New Features

Up to 32 CD-ROM drives are now supported; previously, a maximum of 8 CD-ROM
drives were supported.

3.Software Notes and Recommendations

This patch is intended for UnixWare 1.1.1 systems only 
(UnixWare 1.1.1 is 1.1 with Update 1.1.1 installed).  It cannot be 
installed on other systems.

NOTE: This patch modifies same files as ptf605 and is contained in update
1.1.2

In general, this patch is not necessary unless the system is or will be
configured with more than eight CD-ROM drives.

However, it will not interfere with the operation of systems with eight or
less CD-ROM drives (or none) and may be installed if desired or if it is not
known whether the system may be configured with more than eight CD-ROM drives
in the future.

4.Hardware Notes and Recommendations

None

5.Installation Instructions

Depending on the format:

If this PTF was delivered on a diskette, then (as "root") the following
command should install this patch:

     #pkgadd -d diskette1

If you have a file such as "ptf121," which is in a "stream" format, then (as
"root") the following command should install this patch:

     #pkgadd -d <pwd>/ptf121
     
After installing this patch, do a system reboot to rebuild the kernel and
incorporate the updated drivers.

6.Troubleshooting

After installing this patch, up to 32 CD-ROM drives can now be attached 
to the system.  That I/O operations are being correctly directed to the 
intended drive can be verified by the use of various utilities to 
determine that the actual results are those intended.

The "fsck" utility can be used to verify that the file system(s) on the 
first 8 drives are no longer being corrupted.