Article ID: 113569, created on Mar 28, 2012, last review on Apr 17, 2012

  • Applies to:
  • Virtuozzo hypervisor 5.0
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Synopsis:          New Parallels Server Bare Metal 5.0 kernel provides
                   an update with security and stability fixes.
Issue date:        2012-03-28
Product:           Parallels Server Bare Metal 5.0
Keywords:          'bugfix' 'stability' 'security'

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This document provides information on the new Parallels Server Bare Metal 5.0
kernel, version 2.6.32-042stab053.5.

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TABLE OF CONTENTS

1. About This Release
2. Updates Description
3. Obtaining New Kernel
4. Required RPMs

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1. ABOUT THIS RELEASE

The current update for the Parallels Server Bare Metal 5.0 kernel provides a
new kernel based on the Red Hat 6.2 kernel (2.6.32-220.7.1.el6). The updated
kernel includes a number of security and stability fixes.

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2. UPDATES DESCRIPTION

This update contains fixes for the following issues:

* Online migration could fail at the stage of restoring a huge page on the
  destination Node. (PCLIN-30682)

* Transparent hugepages support has been disabled by default. (PSBM-11811)
  If necessary, you can enable it by running this command:
  # echo always > /sys/kernel/mm/redhat_transparent_hugepage/enabled

* Entering into a Container running Red Hat Enterprise Linux 5 could fail due
  to the absence of kernel support for legacy pseudo terminals. (OVZ# 1995)

* When stopping a Container, a kernel crash could occur if the Container used
  the ip conntracks functionality. (OVZ 2175)

* Several enhancements have been made to the memory reclaimer code to
  prevent possible Node hang-ups in low-memory situations.

* A process making a lot of write requests (e.g., the "dd" utility run with a
  small block size) could start consuming 100% of the CPU time on the Node. This
  could also dramatically decrease disk performance. (PSBM-11755)

* An online migration of a Container with bindmounted files inside could fail.
  In particular, bindmounted files are used by modern versions of the "named"
  service. (PCLIN-30771)

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3. OBTAINING NEW KERNEL

You can download and install this kernel update using the vzup2date utility
included in the Parallels Server Bare Metal 5.0 distribution set.

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4. REQUIRED RPMS

Depending on the processor installed on the Hardware Node, the following RPM
packages are included in the kernel update:

   vzkernel-2.6.32-042stab053.5.x86_64.rpm
   vzkernel-firmware-2.6.32-042stab053.5.noarch.rpm
   vzmodules-2.6.32-042stab053.5.x86_64.rpm
   parallels-kmod-5.0.13271.709218-1.2.6.32_042stab053.5.x86_64.rpm

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Copyright (c) 1999-2012 Parallels Holdings, Ltd. and its affiliates. All rights
reserved.

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