Dear SCO Customer

The enclosed Support Level Supplement (SLS) PTF3216, the UnixWare
'dow_iowait' Supplement, resolves an issue where processes can hang
permanently when accessing an SFS filesystem which is 80% full.
Running crash(1M) shows one or more processes hung in the kernel
function 'dow_iowait()'.

The /etc/conf/pack.d/sfs/Drivers in SLS PTF3216 have been modified 
to correct this issue. 


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

SLS PTF3216 may be installed on:

     SCO UnixWare Application Server Release 2.1.0, 2.1.1 and 2.1.2
     SCO UnixWare Personal Edition Release 2.1.0, 2.1.1 and 2.1.2
 
SLS PTF3216 modifies these files:

     /etc/conf/pack.d/sfs/Driver_atup.o
     /etc/conf/pack.d/sfs/Driver_mp.o
     /usr/ucb/ps

Hardware Notes and Recommendations
----------------------------------

SLS PTF3216 is targeted for the i386, i486 and Pentium CPUs.


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

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

2. Download the ptf3216.Z and the ptf3216.txt files to the newly
   created /tmp/pkg directory on your machine.
 
3. Read the Release Notes contained in the ptf3216.txt file.
 
4. Uncompress the file and add the package to your system using these
   commands:
 
     # uncompress /tmp/pkg/ptf3216.Z
     # pkgadd -d /tmp/pkg/ptf3216 


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

1. Become root and remove the package by typing these commands:

     $ su
     # pkgrm ptf3216

2. Reboot the machine.

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

We appreciate your business.

SCO Support Services