AST RESEARCH, INC.             TECHNICAL BULLETIN # 0873A              7-1-94




                   MANHATTAN SMP AST EMPIRE MULTITHREADED SCO UNIX DRIVER


PROBLEM:     When upgrading from the old AST Empire Multithreaded SCO UNIX
             driver, release 1.0, (P/N 910727-038) to the new multithreaded
             DAC960 UNIX driver (P/N 910727-321; see Software Bulletin #
             0150), the following error is received during the installation
             procedure:

             Please insert the fd(60)sdac volume and press <Return>

             sdac.sdac.Loading module
             or 'q' to quit:
             sdac.sdac.:Loading module fd(60) /sdac/driver/sdac/Driver.o  .text
             ............
             sdac.sdac.:Loading module fd(60) /sdac/driver/sdac/Driver.o  .data
             ............
             sdac.sdac.:Loading module fd(60) /sdac/driver/sdac/Space.o  .data
             ............
             fd(60) /sdac/driver/sdac/Driver.o : Symbol "scsi_distributed"
             not found
             sdac:Driver "sdac" not load.

             Insert N2 (filesystem) floppy and press <Return>


CAUSE:       AST's new Empire driver (P/N 910727-321) is incompatible with the
             following releases of SCO’s operating systems:

             SCO Open Server UNIX System 3.2 version 4.1 or lower.
             SCO Open Server Network System 2.0.0 or lower.
             SCO Open Server Enterprise System 2.0.0 or lower.

SYSTEMS
AFFECTED:        AST                                                 REVISION
             PART NUMBER        DESCRIPTION                            LEVEL

             520092-001      SMP 4-50 2/500 MB                          All
             520155-001      SMP/P60 2/500 MB                           All
             520092-001      SMP 4-50 2/500 MB                          All
             520092-002      SMP 4-50 2/1.0 GB                          All
             520001-001      SPARES KIT SMP                             All
             520155-001      SMP/P60 2/500 MB                           All
             520155-002      SMP/P60 2/1.0 GB                           All
             520155-003      SMP/P60 2/2.0 GB                           All

SOLUTION:    Use SCO Open Server UNIX System release 3.2, version 4.2 or
             higher.
             SCO Open Server Network System 3.0.0.
             SCO Open Server Enterprise System 3.0.0.

NOTE:        Because this driver is multithreaded, the "astctl" command can now
             be used to distribute interrupt services across additional
             processors.  Please review the documentation titled "AST
             Manhattan SMP EFS for SCO UNIX 3.2v4.2 Release 1.1" (part number
             001911-001) that comes with AST's Manhattan SMP for details.
             This document is also included with release 1.1.0 of SCO EFS for
             Manhattan SMP and is located in the Manhattan SMP section of
             AST's BBS.  The file is called "<A HREF="ftp://ftp.ast.com/S-OTHER/SMP6.EXE">SMP6.EXE</A>".

             The Empire driver is also located in the Manhattan SMP section of
             AST's BBS and is available for download.  The file on the BBS is
             called "<A HREF="ftp://ftp.ast.com/S-OTHER/SMP19.EXE">SMP19.EXE</A>".

             Additionally, all of the disk subsystem statistics are now
             available through the use of the "sar -d" UNIX command.