Patch Name: PHKL_0517

Patch Description: S700/SCSI selection timeouts and SCSI disk request retries.

   SCSI Selection Timeout
   ----------------------

   Symptoms:

      There are two different scenario of this problem:

      1) A selection timeout on CORE SCSI can leave a stacked interrupt
         on the SCSI controller.  This stacked interrupt will cause a panic.

      2) A selection timeout on EISA SCSI issues a SCSI bus reset to
         terminate selection.  During EISA bus walking, bus resets
         will be issued to terminate selection for non-existant devices.
         Multiple bus resets can cause a file system swap to fail, thereby
         causing a panic.

   Fix:

      1) After a selection timeout on CORE SCSI, the SCSI controller
         interrupt stack is flushed, thereby clearing any unwanted
         interrupts.

      2) After a selection timeout on EISA SCSI, the SCSI controller
         will be re-initialized to terminate selection, instead of
         issuing a SCSI bus reset.

   SCSI Disk Request Retries
   -------------------------

   Symptoms:

      The SCSI disk device driver will not retry some requests, which
      would normally complete successfully if retried, based on the
      error type.

      File system swaps will panic with
         "panic: (display==0xXXXX, flags==0xX)
                 devswap_pagein: syncpageio detected an error".

      User process SCSI disk accesses fail with
         "Pid NNNNN killed due to text modification or page I/O error".

   Fix:

      All SCSI disk requests will be retried, except for selection timeout
      and illegal request.

Path Name: /hp-ux_patches/s700/8.X/PHKL_0517

Effective Date: 911008

Patch Files: /system/PHKL_0517/new/s2disk.o
             /system/PHKL_0517/new/sim0.o

SR/APR#: None.

"what" string/timestamp:
   PATCH_8.05: s2disk.o $Revision: 1.2.43.46 $ $Date: 91/10/08 08:49:55 $
   PATCH_8.05: sim0.o $Revision: 1.2.43.40 $ $Date: 91/10/08 08:50:16 $

"sum" output: 14880 67 s2disk.o
              26389 98 sim0.o

Dependencies: None.

Supersedes: None.

Patch Package Size: 110 Kbytes

Installation Instructions: 

     Please review all instructions and the Hewlett-Packard
     SupportLine User Guide or your Hewlett-Packard support terms
     and conditions for precautions, scope of license,
     restrictions, and, limitation of liability and warranties,
     before installing this patch.

     Note: Please back up your system before you patch.

---------------------------------------------------------------------------
After getting the patch onto your machine, unshar the patch (sh PHKL_0517).

To install this patch do the following:
1) Run the update program (Note: you must be logged in as root to update
   a system).
2) Once in the update "Main Menu" move the highlighted line to "Change
   Source or Destination ->" and press "Return" or "Select Item".
3) Make sure the highlighted item in the "Change Source or Destination"
   window is "From Tape Device to Local System ...", then press "Return" or
   "Select Item".
4) You should now be in the "From Tape Device to Local System" window.
   Change the "Source:  /dev/rmt/0m" to "Source: /tmp/PHKL_0517.updt" 
   (this assumes that you are in the /tmp directory where PHKL_0517.updt
   has been placed).  Note: You must enter the complete path name.
5) Press "Done".
6) From here on follow the standard directions for update.

The customized script that update runs will move the original software 
to /system/PHKL_0517/orig.  HP recommends keeping this software there in
order to recover from any potential problems.  It is also recommended that
you move the PHKL_0517.text file to /system/PHKL_0517 to be retained for
future reference.

If you wish to put this patch on a magnetic tape and update from the tape
drive, dd a copy of the patch to the tape drive.  As an example the
following will create a copy of the patch that update can read:
dd if=PHKL_0517.updt of=/dev/rmt/0m bs=2048