Patch Name: PHKL_22157

Patch Description: s700 10.20 FC Reset & HPMC at shutdown/reboot fixes

Creation Date: 00/08/16

Post Date:  00/08/30

Hardware Platforms - OS Releases:
	s700: 10.20

Products: N/A

Filesets:
	OS-Core.CORE-KRN

Automatic Reboot?: Yes

Status: General Release

Critical:
	No (superseded patches were critical)
	PHKL_19871: HANG
	PHKL_17693: OTHER
		HPMC

Path Name: /hp-ux_patches/s700/10.X/PHKL_22157

Symptoms:
	PHKL_22157:
	( SR: 8606156043 CR: JAGad25354 )
	In a configuration involving multiple hosts attached to a
	fibre channel private loop, if one or more of the hosts is
	rebooted, the non-rebooting host(s) experience I/O
	performance problems.  Additionally, in some cases, if an
	'ioscan' is executed on a non-rebooting host during the
	reboot window, a status of "NO_HW" may be generated for some
	of the devices on the fibre.

	PHKL_19871:
	(SR: 8606113341 DTS: JAGab12583)
	When soft-rebooting (reboot/shutdown -r) a node without
	doing a hardware reset, connections to all FC devices will
	be lost, causing the whole cluster to be unusable.

	PHKL_17693:
	HPMC while running reboot -h (or shutdown -h) to shut down
	the system.  This is a generic problem that could happen on
	any platform with a lot of peripherals.

Defect Description:
	PHKL_22157:
	( SR: 8606156043 CR: JAGad25354 )
	When you reboot a machine on a fibre channel loop, its FC
	card may start sending garbage; this can cause severe
	performance degradation that may result in the inability
	to communicate with devices on the fibre.

	Resolution:
	Prior to this patch, the OS would reset the I/O subsystem
	during a shutdown, panic or HPMC, but not a reboot. Now the
	OS will execute the same piece of code in all cases.

	PHKL_19871:
	( SR: 8606113341 DTS: JAGab12583 )
	FC interfaces did not get reset when soft-rebooting a
	machine, causing all the connected devices to be
	disconnected and inaccessable.

	Resolution:
	Add PDC_IO to reset FC interfaces when rebooting the kernel.

	PHKL_17693:
	Some devices were not already shutdown prior to the system
	walking the shutdown path.

	Resolution:
	Make sure all devices are shutdown before proceeding down
	the shutdown path.

SR:
	1653250050 8606105005 8606156043

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

what(1) Output:
	/usr/conf/lib/libhp-ux.a(machdep.o):
		machdep.c $Date: 2000/08/07 17:08:01 $ $Revision: 1.
			126.98.11 $ PATCH_10.20 (PHKL_22157)

cksum(1) Output:
	3098910584 30592 /usr/conf/lib/libhp-ux.a(machdep.o)

Patch Conflicts: None

Patch Dependencies:
	s700: 10.20: PHKL_16750

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHKL_17693 PHKL_19871

Equivalent Patches:
	PHKL_22158:
	s800: 10.20

Patch Package Size: 90 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_22157

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

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHKL_22157.depot

	By default swinstall will archive the original software in
	/var/adm/sw/patch/PHKL_22157.  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_22157.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_22157.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:
	This patch depends on base patch PHKL_16750.
	For successful installation, please ensure that PHKL_16750
	is in the same depot with this patch, or PHKL_16750 is
	already installed.