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when accessing shares on EMC NAS. This issue is characterized by the following kernel messages:
kernel: CIFS VFS: server not responding
kernel: CIFS VFS: No response for cmd 162 mid 380
kernel: CIFS VFS: RFC1001 size 135 bigger than SMB for Mid=384
After a CIFS mount, it becomes impossible to read/write any file on it and any application that
attempts an I/O on the mountpoint will hang. To resolve this issue, upgrade to NAS Code 5.5.27.5 or
later (use EMC Primus case number emc165978).
MODULE_FIRMWARE tags are now supported.
ICH9 controllers are now supported.
Greyhound processors are now supported in CPUID calls.
The getcpu system call is now supported.
Oprofile now supports new Greyhound performance counter events.
Directed DIAG is now supported to improve z/VM utilization.
The Intel graphics chipset is now supported through the DRM kernel module. Further, the DRM API
has been upgraded to version 1.3 to support direct rendering.
Updates to ACPI power management have improved S3 suspend-to-RAM and S4 hibernate.
3.5. Other Updates
gaim is now called pidgin.
The certified memory limit for this architecture is now 1TB (increased from 256GB).
Implicit active-active failover using dm -multipath on EMC Clariion storage is now supported.
The Chinese font Zysong is no longer installed as part of the fonts-chinese package. Zysong is
now packaged separately as fonts-chinese-zysong. The fonts-chinese-zysong package is
located in the Supplem entary CD.
Note that the fonts-chinese-zysong package is needed to support the Chinese National
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3. Release Notes for ia64
Standard GB18030.
The Challenge Handshake Authentication Protocol (CHAP) username and password have a
character limit of 256 each.
pum p is deprecated in this update. As such, configuring your network interface through netconfig
may result in broken ifcfg scripts.
To properly configure your network interface, use system-config-network instead. Installing the
updated system -config-network package removes netconfig.
rpm --aid is no longer supported. It is recommended that you use yum when updating and
installing packages.
3.6. Technology Previews
Technology Preview features are currently not supported under Red Hat Enterprise Linux 5.1
subscription services, may not be functionally complete, and are generally not suitable for production
use. However, these features are included as a customer convenience and to provide the feature with
wider exposure.
Customers may find these features useful in a non-production environment. Customers are also free to
provide feedback and functionality suggestions for a Technology Preview feature before it becomes fully
supported. Erratas will be provided for high-severity security issues.
During the development of a Technology Preview feature, additional components may become available
to the public for testing. It is the intention of Red Hat to fully support Technology Preview features in a
future release.
Stateless Linux
Stateless Linux is a new way of thinking about how a system should be run and managed,
designed to simplify provisioning and management of large numbers of systems by making
them easily replaceable. This is accomplished primarily by establishing prepared system
images which get replicated and managed across a large number of stateless systems, running
the operating system in a read-only manner (refer to /etc/sysconfig/readonly-root for
more details).
In its current state of development, the Stateless features are subsets of the intended goals. As
such, the capability remains as Technology Preview.
The following is a list of the initial capabilities included in Red Hat Enterprise Linux 5:
running a stateless image over NFS
running a stateless image via loopback over NFS
running on iSCSI
It is highly recommended that those interested in testing stateless code read the HOWTO at
http://fedoraproject.org/wiki/StatelessLinuxHOWTO and join stateless-list@redhat.com.
The enabling infrastructure pieces for Stateless Linux were originally introduced in Red Hat
Enterprise Linux 5.
AIGLX
AIGLX is a Technology Preview feature of the otherwise fully supported X server. It aims to
enable GL-accelerated effects on a standard desktop. The project consists of the following:
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Red Hat Enterprise Linux 5 5.1 Release Notes
a lightly modified X server
an updated Mesa package that adds new protocol support
By installing these components, you can have GL-accelerated effects on your desktop with very
few changes, as well as the ability to enable and disable them at will without replacing your X
server. AIGLX also enables remote GLX applications to take advantage of hardware GLX
acceleration.
FS-Cache
FS-Cache is a local caching facility for remote file systems that allows users to cache NFS data
on a locally mounted disk. To set up the FS-Cache facility, install the cachefilesd RPM and
refer to the instructions in /usr/share/doc/cachefilesd-/README.
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