Patch Name: PHKL_19704

Patch Description: s700 10.20 LVM : Parallel read and bad block relocation

Creation Date: 99/09/01

Post Date:  99/09/07

Hardware Platforms - OS Releases:
	s700: 10.20

Products: N/A

Filesets:
	LVM.LVM-KRN

Automatic Reboot?: Yes

Status: General Superseded

Critical:
	Yes
	PHKL_19704: PANIC

Path Name: /hp-ux_patches/s700/10.X/PHKL_19704

Symptoms:
	PHKL_19704:
	( SR: 1653305987 DTS: JAGab17773 )
	If bad block relocation is enabled on a logical volume
	with parallel read support, then any requests to a
	block currently being relocated results in system panic.

Defect Description:
	PHKL_19704:
	( SR: 1653305987 DTS: JAGab17773 )
	Currently, LVM does not allow bad block relocation with
	parallel read operation for consistency in bad block
	relocation. So when a bad block relocation is going on
	and a new request comes on to the same block then
	we panic.

	As an enhancment, we enable bad block relocation with
	parallel read operation if we notice that the block we
	are accessing is being relocated, depending on the
	state either initiate bad block relocation or wait till
	the bad block relocation is completed. If REL_DESIRED
	meaning a read noticed a bad block is set on a block
	then we initiate the relocation for this block.
	If REL_PENDING or REL_DEVICE meaning relocation is going
	on, then we wait till the relocation is completed and
	then we will do the I/O from the new location.

	Resolution :

	Modified lv_hwreloc() and lv_validblk() for taking
	action appropriately for the above mentioned states.

SR:
	1653305987

Patch Files:
	/usr/conf/lib/liblvm.a(lv_defect.o)

what(1) Output:
	/usr/conf/lib/liblvm.a(lv_defect.o):
		lv_defect.c $Date: 99/09/01 13:33:02 $ $Revision: 1.
			16.98.7 $ PATCH_10.20 (PHKL_19704)

cksum(1) Output:
	890489554 12756 /usr/conf/lib/liblvm.a(lv_defect.o)

Patch Conflicts: None

Patch Dependencies:
	s700: 10.20: PHKL_16750

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_19705:
	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_19704

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

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHKL_19704.depot

	By default swinstall will archive the original software in
	/var/adm/sw/patch/PHKL_19704.  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_19704.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_19704.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.