Patch Name:  PHKL_10768

Patch Description: s700 10.20 PC floppy driver cumulative patch

Creation Date: 97/05/16

Post Date:  97/06/23

Hardware Platforms - OS Releases:
        s700: 10.20

Products: N/A

Filesets:
        OS-Core.CORE-KRN

Automatic Reboot?: Yes

Status: General Superseded

Critical:
        Yes
        PHKL_10768: CORRUPTION

Path Name:  /hp-ux_patches/s700/10.X/PHKL_10768

Symptoms:
        PHKL_10768:
        Some writes will fail but will not be reported.  This can
        result in unknown data corruption.  These types of failures
        occur on newer workstations with a high load of I/O
        processes.

        PHKL_9011:
        Geometry problem reports that media with 77 tracks has 80
        tracks, but you cannot write to tracks 78, 79, and 80.
        The data loss with the "dd" command only occurs on newest
        workstations with extreme load of I/O processes.

Defect Description:
        PHKL_10768:
        The write corruption occurs on PC floppy media during
        heavy I/O load.  The problem occurs when the floppy disk
        controller (FDC) encounters a data underrun when writing to
        the floppy disk.  The problem does not occur on every
        data under-run condition and is usually only seen under
        heavy system load and newer workstations with fast
        processors.

        PHKL_9011:
        Using floppy media with 77 tracks, the ioctl commands will
        report 80 tracks, but you cannot write to the last tracks.
        The write corruption occurs on PC floppy media during loop
        of dd commands and pdc_model calls under heavy I/O load.
        The problem occurs when the floppy-disk-controller (FDC)
        enters unknown state during high numbers of interrupts.
        Problem only found under extreme load conditions on newer
        workstations with very fast processors.

SR:
        4701354852 5003321364

Patch Files:
        /usr/conf/lib/libhp-ux.a(pc_fdc.o)
        /usr/conf/lib/libhp-ux.a(pc_floppy.o)

what(1) Output:
        /usr/conf/lib/libhp-ux.a(pc_fdc.o):
                pc_fdc.c $Date: 97/05/16 14:37:39 $ $Revision: 1.5.9
                        8.8 $ PATCH_10.20 (PHKL_10768)
        /usr/conf/lib/libhp-ux.a(pc_floppy.o):
                pc_floppy.c $Date: 97/05/16 14:38:53 $ $Revision: 1.
                        6.98.7 $ PATCH_10.20 (PHKL_10768)

cksum(1) Output:
        1532376755 29384 /usr/conf/lib/libhp-ux.a(pc_fdc.o)
        306456479 23056 /usr/conf/lib/libhp-ux.a(pc_floppy.o)

Patch Conflicts: None

Patch Dependencies:  None

Hardware Dependencies:  None

Other Dependencies:  None

Supersedes:
        PHKL_9011

Equivalent Patches:
        PHKL_11138:
        s800: 10.20

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.
        ------------------------------------------------------------
        1. Back up your system before installing a patch.

        2. Login as root.

        3. Copy the patch to the /tmp directory.

        4. Move to the /tmp directory and unshar the patch:

                cd /tmp
                sh PHKL_10768

        5a. For a standalone system, run swinstall to install the
            patch:

                swinstall -x autoreboot=true -x match_target=true \
                        -s /tmp/PHKL_10768.depot

        5b. For a homogeneous NFS Diskless cluster run swcluster on the
            server to install the patch on the server and the clients:

                swcluster -i -b

            This will invoke swcluster in the interactive mode and
            force all clients to be shut down.

            WARNING: All cluster clients must be shut down prior to the
                     patch installation.  Installing the patch while the
                     clients are booted is unsupported and can lead to
                     serious problems.

            The swcluster command will invoke an swinstall session in which
            you must specify:

                alternate root path  -  default is /export/shared_root/OS_700
                source depot path    -  /tmp/PHKL_10768.depot

            To complete the installation, select the patch by choosing
            "Actions -> Match What Target Has" and then "Actions -> Install"
            from the Menubar.

        5c. For a heterogeneous NFS Diskless cluster:

                - run swinstall on the server as in step 5a to install
                  the patch on the cluster server.

                - run swcluster on the server as in step 5b to install
                  the patch on the cluster clients.

        By default swinstall will archive the original software in
        /var/adm/sw/patch/PHKL_10768.  If you do not wish to retain a
        copy of the original software, you can create an empty file
        named /var/adm/sw/patch/PATCH_NOSAVE.

        Warning: If this file exists when a patch is installed, the
                 patch cannot be deinstalled.  Please be careful
                 when using this feature.

        It is recommended that you move the PHKL_10768.text file to
        /var/adm/sw/patch for future reference.

        To put this patch on a magnetic tape and install from the
        tape drive, use the command:

                dd if=/tmp/PHKL_10768.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:  None