Dear SCO Customer,

Support Level Supplement (SLS) ptf7636a, the UnixWare 7.1.0 and 7.1.1 vol 
Driver Supplement, addresses the following problem:

        Panics can occur due to vxfs not checking for vnode softcounts
        before performing kmem_free() on the vx_bignode.


Contents
--------

        /etc/conf/pack.d/vol/Driver_atup.o
        /etc/conf/pack.d/vol/Driver_mp.o


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

SLS ptf7636a should only be installed on:

        UnixWare 7 Release 7.1.0, 7.1.1

NOTE:  This supplement has been superseded by
the UnixWare 7.1.1 Maintenance Pack for UnixWare 7.1.1 platforms
only.  The UnixWare 7.1.1 Maintenance Pack is available from:

ftp://ftp.caldera.com/pub/unixware7/uw711pk


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

1. Download the ptf7636a.Z file to the /tmp directory on your machine.

2. As root, uncompress the file and add the SLS package to your system
   using these commands:

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf7636a.Z
        # pkgadd -d /tmp/ptf7636a
        # rm /tmp/ptf7636a


Alternatively, this SLS package may be installed in quiet mode, 
that is, without displaying the release notes and asking for 
installation confirmation.  To do this, use these commands:

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf7636a.Z
        # pkgadd -qd /tmp/ptf7636a all
        # rm /tmp/ptf7636a

3. Reboot the system after installing this SLS package.

The release notes displayed prior to installation can be found in:

        /var/sadm/pkg/ptf7636/install/ptf7636.txt


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

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

        $ su
        Password: <type your root password>
        # pkgrm ptf7636

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.