Patch Name: PHKL_18499

Patch Description: s700 10.20 ufs disksort patch

Creation Date: 99/05/04

Post Date:  99/05/06

Hardware Platforms - OS Releases:
	s700: 10.20

Products: N/A

Filesets:
	OS-Core.CORE-KRN

Automatic Reboot?: Yes

Status: General Superseded

Critical:
	Yes
	PHKL_18499: CORRUPTION

Path Name: /hp-ux_patches/s700/10.X/PHKL_18499

Symptoms:
	PHKL_18499:
	File system corruption could occur on ufs in some situations
	where reads and writes were made simultaneously to the same
	disk block.

Defect Description:
	PHKL_18499:
	A ufs routine was incorrectly merging raw device requests
	into the i/o request chain of a different type (read vs.
	write) which involved the same disk block.

	Resolution:
	The ufs routine was fixed to no longer merge requests of
	different types.

SR:
	1653281659

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

what(1) Output:
	/usr/conf/lib/libhp-ux.a(ufs_dsort.o):
		ufs_dsort.c    $Date: 99/04/29 12:22:18 $ $Revision:
			 1.20.98.12 $ PATCH_10.20 (PHKL_18499)

cksum(1) Output:
	225822455 9372 /usr/conf/lib/libhp-ux.a(ufs_dsort.o)

Patch Conflicts: None

Patch Dependencies:
	s700: 10.20: PHKL_16750

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_18500:
	s800: 10.20

Patch Package Size: 70 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_18499

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

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHKL_18499.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_18499.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_18499.  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_18499.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_18499.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:
	This patch depends on base patch PHKL_16750 .
	For successful installation please insure that PHKL_16750
	is in the same depot with PHKL_18499, or PHKL_16750  is
	already installed.