Patch Name: PHKL_12237

Patch Description: s700 10.20 panic: alloc_from_pool: no I/O message frames

Creation Date: 97/08/22

Post Date:  97/08/27

Warning: 97/08/29 - This Non-Critical Warning has been issued by HP.

	PHKL_12237 has been removed from distribution because the
	problems addressed by this patch can only occur on the s800
	systems.  Thus, PHKL_12237 is not really defective it is
	simply unecessary on the s700 systems.  If the patch has
	has been installed, it does not need to be removed because
	it will not harm the system.  The patch simply modifies a
	portion of code that is not utilized on the s700 systems.

Hardware Platforms - OS Releases:
	s700: 10.20

Products: N/A

Filesets:
	OS-Core.CORE-KRN

Automatic Reboot?: Yes

Status: General Release With Warnings

Critical:
	Yes
	PHKL_12237: PANIC

Path Name: /hp-ux_patches/s700/10.X/PHKL_12237

Symptoms:
	PHKL_12237:
	System panics with message "panic: alloc_from_pool: no
	I/O message frames". This occurs only on S800 systems
	that are using NIO interfaces. Message frame pool can
	be exhausted, if queue depth for scsi devices has been
	increased from the default depth of 8, and the system
	is using very fast disk types that effectivly make use
	of the deeper queue. In these rare cases, the system
	might panic with above message.

Defect Description:
	PHKL_12237:
	Global I/O message frame pool might be sized too small in
	case we use certain system configuration maximums. The
	problem was uncovered by setting the queue depth for scsi
	devices to its maximum allowed value of 32. Very fast new
	disk drives, in combination with the async driver, have
	been able to make use of the deeper queue and lead to the
	exhaustion of the message frame pool.

SR:
	5003381780

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

what(1) Output:
	/usr/conf/lib/libhp-ux.a(sio_sys_config.o):
		sio_sys_config.c $Date: 97/08/21 16:19:27 $ $Revisio
			n: 1.6.98.4 $ PATCH_10.20 (PHKL_12237)

cksum(1) Output:
	2970307047 7340 /usr/conf/lib/libhp-ux.a(sio_sys_config.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies:
	This patch is only necessary for S800 systems that are using
	NIO interfaces.

Supersedes: None

Equivalent Patches:
	PHKL_12238:
	s800: 10.20

Patch Package Size: 60 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_12237

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

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHKL_12237.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_12237.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_12237.  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_12237.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_12237.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None