||Date and Time
Red Hat Enterprise Linux 5.4
Release Notes for all architectures.
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1st July 2009
This document details the Release Notes Red Hat Enterprise Linux
This document contains the Release Notes for the Red Hat Enterprise Linux 5.4 (kernel-2.6.18-154.EL) family of products including:
Red Hat Enterprise Linux 5 Advanced Platform for x86, AMD64/Intel® 64, Itanium Processor Family, System p and System z
Red Hat Enterprise Linux 5 Server for x86, AMD64/Intel® 64, Itanium Processor Family, System p and System z
Red Hat Enterprise Linux 5 Desktop for x86 and AMD64/Intel®
The Release Notes provide high level coverage of the improvements and additions that have been implemented in Red Hat Enterprise Linux 5.4.
The format of the Release Documentation has changed for Red Hat Enterprise Linux 5.4. The Release Notes now contain an overview of important feature updates, bugfixes and Technology Previews. The new Technical Notes
document details all
updated packages, known issues and Technology Previews.
1. Virtualization Updates
Red Hat Enterprise Linux 5.4 now includes full support for the Kernel-based Virtual Machine (KVM) hypervisor on x86_64 based architectures. KVM is integrated into the Linux kernel, providing a virtualization platform that takes advantage of the stability, features, and hardware support inherent in Red Hat Enterprise Linux. Virtualization using the KVM hypervisor is supported on wide variety of guest operating systems, including:
Red Hat Enterprise Linux 3
Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 5
Windows Server 2003
Windows Server 2008
Xen based virtualization is fully supported. However, Xen-based virtualization requires a different version of the kernel to function. The KVM hypervisor can only be used with the regular (non-Xen) kernel.
While Xen and KVM may be installed on the same system, the default networking configuration for these are different. Users are strongly recommended to only install one hypervisor on a system.
Xen is the default hypervisor that is shipped with Red Hat Enterprise Linux. As such all configuration defaults are tailored for use with the Xen hypervisor. For details on configuring a system for KVM, please refer to the Virtualization Guide.
Virtualization using KVM allows both 32-bit and 64-bit versions of guest operating systems to be run without modification. Paravirtualized disk and network drivers have also been included in Red Hat Enterprise Linux 5.4 for enhanced I/O performance. All the libvirt based tools (i.e.
virt-manager) have also been updated with added support for KVM.
USB passthrough with the KVM hypervisor is considered to be a Technology Preview for the 5.4 release.
With resolution of various issues such as: save/restore, live migration and core dumps, Xen based 32 bit paravirtualized guests on x86_64 hosts are no longer classed as a Technology Preview, and are fully supported on Red Hat Enterprise Linux 5.4.
etherboot package has been added in this update, providing the capability to boot guest virtual machines using the Preboot eXecution Environment (PXE). This process occurs before the OS is loaded and sometimes the OS has no knowledge that it was booted through PXE. Support for etherboot is limited to usage in the KVM context.
qspice packages have been added to Red Hat Enterprise Linux 5.4 to support the spice protocol in
qemu-kvm based virtual machines.
qspice contains both client, server and web browser plugin components. However, only the
qspice server in the
qspice-libs package is fully supported. The qspice client (supplied by the qspice package) and qspice mozilla plugin (supplied by the qspice-mozilla package) are both included as Technology Previews. The
qspice-libs package contains the server implementation that is used in conjunction with
qemu-kvm and as such is fully supported. However, in Red Hat Enterprise Linux 5.4 there is no
libvirt support for the spice protocol; the only supported use of
spice in Red Hat Enterprise Linux 5.4 is through the use of the Red Hat Enterprise Virtualization product.
Clusters are multiple computers (nodes) working in concert to increase reliability, scalability, and availability to critical production services.
All updates to clustering in Red Hat Enterprise Linux 5.4 are detailed in the Technical Notes. Further information on clustering in Red Hat Enterprise Linux is available in the Cluster Suite Overview
and the Cluster Administration
Cluster Suite tools have been upgraded to support automatic hypervisor detection. However, running the cluster suite in conjunction with KVM hypervisor is considered to be a Technology Preview.
OpenAIS now provides broadcast network communication in addition to multicast. This functionality is considered Technology Preview for standalone usage of OpenAIS and for usage with the Cluster Suite. Note, however, that the functionality for configuring OpenAIS to use broadcast is not integrated into the cluster management tools and must be configured manually.
SELinux in Enforcing mode is not supported with the Cluster Suite; Permissive or Disabled modes must be used. Using Cluster Suite on bare metal PPC systems is not supported. Guests running Cluster Suite on VMWare ESX hosts and using fence_vmware is considered a Technology Preview. Running Cluster Suite in guests on VMWare ESX hosts that are managed by Virtual Center is not supported.
Mixed architecture clusters using Cluster Suite are not supported. All Nodes in the cluster must be of the same architecture. For the purposes of Cluster Suite, x86_64, x86 and ia64 are considered to be the same architecture, so running clusters with combinations of these architectures is supported.
2.1. Fencing Improvements
Fencing is the disconnection of a node from the cluster's shared storage. Fencing cuts off I/O from shared storage, thus ensuring data integrity.
In Red Hat Enterprise Linux 5.4, fencing support on Power Systems has been added, as a Technology Preview, for IBM Logical Partition (LPAR) instances that are managed using the Hardware Management Console (HMC) (BZ#485700)
. Fencing support has also been added, as a Technology Preview for Cisco MDS 9124 & Cisco MDS 9134 Multilayer Fabric Switches (BZ#480836).
fence_virsh fence agent is provided in this release of Red Hat Enterprise Linux as a Technology Preview.
fence_virsh provides the ability for one guest (running as a domU) to fence another using the libvirt protocol. However, as
fence_virsh is not integrated with cluster-suite it is not supported as a fence agent in that environment.
Additionally, the following new articles on fencing have been published on the Red Hat Knowledge Base:
With this update, Generic Receive Offload (GRO) support has been implemented in both the kernel and the userspace application, ethtool
) The GRO system increases the performance of inbound network connections by reducing the amount of processing done by the Central Processing Unit (CPU). GRO implements the same technique as the Large Receive Offload (LRO) system, but can be applied to a wider range of transport layer protocols. GRO support has also been added to a several network device drivers, including the igb driver for Intel® Gigabit Ethernet Adapters and the ixgbe driver for Intel 10 Gigabit PCI Express network devices.
The Netfilter framework (the portion of the kernel resposible for network packet filtering) has been updated with added support for Differentiated Services Code Point (DSCP) values
(Berkeley Internet Name Domain) package provides an implementation of the DNS (Domain Name System) protocols. Previously, bind did not offer a mechanism to easily distinguish between requests that will receive authoritative and non-authoritative replies. Consequently, an incorrectly configured server may have replied to requests that should have been denied. With this update, bind has been updated, providing the new option
that controls access to non-authoritative data on a server (for example: cached recursive results and root zone hits). (BZ#483708)
In the 5.4 update, several significant additions have been made to file systems support. Base Red Hat Enterprise Linux now includes the
Filesystem in Userspace (FUSE)
kernel modules and user space utilities, allowing users to install and run their own
file systems on an unmodified Red Hat Enterprise Linux kernel (BZ#457975)
. Support for the
file system has also been added to the kernel as a Technology Preview (BZ#470845)
. The FIEMAP input/output control (ioctl) interface has been implemented, allowing the physical layout of files to be mapped efficiently. The FIEMAP ioctl can be used by applications to check for fragmentation of a specific file or to create an optimized copy of a sparsely allocated file (BZ#296951)
Additionally, the Common Internet File System (CIFS) has been updated in the kernel (BZ#465143)
. The ext4 file system (included in Red Hat Enterprise Linux as a Technology Preview) has also been updated (BZ#485315)
In Red Hat Enterprise Linux 5.4, the use of the Global File System 2 (GFS2) as a single server file system (i.e. not in a clustered environment) is deprecated. Users of GFS2 that do not need high availability clustering are encouraged to look at migrating to other file systems like the ext3 or xfs offerings. The xfs file system is specifically targeted at very large file systems (16 TB and above). Existing users will continue to be supported.
The required semantics indicate that a process which completes a
stat, write, stat
, should see a different
(time of last modification) on the file in the results from the second stat call compared to the
in the results from the first stat call. File times in NFS are maintained strictly by the server, so the file
will not be updated until the data has been transmitted to the server via the
protocol operation. Simply copying data into the pagecache is not sufficient to cause the
to be updated. This is one place where NFS differs from local file systems. Therefore, an NFS filesystem which is under a heavy write workload may result in stat calls having a high latency.(BZ#469848)
The ext4 filesystem Technology Preview has been refreshed with updated userspace tools. Ext4 is an incremental improvement on the ext3 file system developed by Red Hat and the Linux community.
In previous versions of Red Hat Enterprise Linux utilizing the ext4 Technology Preview, ext4 filesystems were labeled as
ext4dev. With this update, ext4 filesystems are now tagged as
samba3x and ctdb are provided as a Technology Preview on the x86_64 platform. Samba3x package provides Samba 3.3 and ctdb provide a clustered TDB backend. Running samba3x and ctdb on a set of cluster nodes with GFS file system will allow the export of a clustered CIFS filesystem. These components are provided in an alternate child channel since they conflict with files installed from the samba package in the Client and Server groups
5.1. Advanced Linux Sound Architecture
In Red Hat Enterprise Linux 5.4, the Advanced Linux Sound Architecture (ALSA) has been updated — providing enhanced support for High Definition Audio (HDA).
ati driver for ATI video devices has been updated.
intel drivers for Intel integrated display devices have been updated.
mga driver for Matrox video devices has been updated.
nv driver for nVidia video devices has been updated.
Previously, when undocking and docking some laptops with docking stations containing integrated CD/DVD drives, the drive would no longer be recognized. The system would need to be rebooted for the drive to be accessible. With this update, the ACPI docking drivers have been updated in the kernel, resolving this issue. (BZ#485181).
SystemTap is now fully supported, and has been re-based to the latest upstream version. This update features improved user-space probing through shared libraries, experimental DWARF unwinding, and a new
<sys/sdt.h> header file which provides dtrace-compatible markers.
This re-base also enhances support for
debuginfo-less operations. Typecasting (through the @cast operator) is now supported, along with kernel tracepoint probing. Several
'kprobe.*' probe bugs that hampered
debuginfo-less operations are also now resolved.
SystemTap also features several documentation improvements. A new '
3stap' feature provides users with useful man pages on most SystemTap probes and functions. The
systemtap-testsuite package also features a larger library of sample scripts.
For more information about the SystemTap re-base, please refer to the SystemTap section Package Updates chapter of the Technical Notes.
Systemtap tracepoints are placed in important sections of the kernel, allowing system administrators to analyze the performance of, and debug portions of code. In Red Hat Enterprise Linux 5.4, tracepoints have been added to the following sections of the kernel subsystem as a Technology Preview:
The Gnu Compiler Collection version 4.4 (GCC4.4) is now included in this release as a Technology Preview. This collection of compilers include C, C++, and Fortran compilers along with support libraries.
glibc new MALLOC behaviour: The upstream glibc has been changed recently to enable higher scalability across many sockets and cores. This is done by assigning threads their own memory pools and by avoiding locking in some situations. The amount of additional memory used for the memory pools (if any) can be controlled using the environment variables MALLOC_ARENA_TEST and MALLOC_ARENA_MAX.
MALLOC_ARENA_TEST specifies that a test for the number of cores is performed once the number of memory pools reaches this value. MALLOC_ARENA_MAX sets the maximum number of memory pools used, regardless of the number of cores.
The glibc in the RHEL 5.4 release has this functionality integrated as a Technology Preview of the upstream malloc. To enable the per-thread memory pools the environment variable MALLOC_PER_THREAD needs to be set in the environment. This environment variable will become obsolete when this new malloc behaviour becomes default in future releases. Users experiencing contention for the malloc resources could try enabling this option.
7. Architecture Specific Support
In a virtual environment, timekeeping for Red Hat Enterprise Linux 64-bit kernels can be problematic, since time is kept by counting timer interrupts. De- and re-scheduling the virtual machine can cause a delay in these interrupts, resulting in a timekeeping discrepancy. This kernel release reconfigures the timekeeping algorithm to keep time based on a time-elapsed counter. (Bugzilla #463573
It was found that, if their stacks exceed the combined size of ~4GB, 64-bit threaded applications slowed down drastically in
. This is because
to allocate those stacks. As the use of
is a legacy implementation, this update adds a new flag (
) to the kernel to avoid constraining 64-bit applications. (Bugzilla #459321
The update includes a feature bit that encourages TSCs to keep running in deep-C states. This bit
acts in conjunction with
indicates that the TSC runs at constant frequency irrespective of P/T- states, and
indicates that TSC does not stop in deep C-states. (Bugzilla #474091
This update includes a patch to include
headers in kernel-devel packages built on or for i386, i486, i586 and i686 architectures. (Bugzilla #491775
This update includes a fix to ensure that specifying
as a boot parameter on i386 architectures yields a new BIOS map. (Bugzilla #464500
This update adds a patch to correct a problem with the Non-Maskable Interrupt (NMI) that appeared in previous kernel releases. The problem appeared to affect various Intel processors and caused the system to report the NMI watchdog was 'stuck'. New parameters in the NMI code correct this issue. (Bugzilla #500892
This release re-introduces PCI Domain support for HP xw9400 and xw9300 systems. (Bugzilla #474891
Functionality has been corrected to export module powernow-k8 parameters to /sys/modules. This information was previously not exported.(Bugzilla #492010
An optimization error was found in
. When running 32-bit processes on a 64-bit machine systems didn't return ENOSYS on missing (out of table range) system calls. This kernel release includes a patch to correct this. (Bugzilla #481682
Some cluster systems were found to boot with an unstable time source. It was determined that this was a result of kernel code not checking for a free performance counter (
PERFCTR) when calibrating the
TSC (Time Stamp Clock) during the boot process. This resulted, in a small percentage of cases, in the system defaulting to a busy PERFCTR and getting unreliable calibrations.
A fix was implemented to correct this by ensuring the system checked for a free
before defaulting (Bugzilla #467782
). This fix, however, cannot satisfy all possible contingencies as it is possible that all
s will be busy when required for
calibration. Another patch has been included to initiate a kernel panic in the unlikely event (fewer than 1% of cases) that this scenario occurs. (Bugzilla #472523
This kernel release includes various patches to update the
(Synergistic Processing Units file system) for Cell processors. (Bugzilla #475620
An issue was identified wherein
would list logical PVR Power7 processor architecture as "unknown" when
was run. This update adds a patch to have
identify Power7 architectures as Power6. (Bugzilla #486649
This update includes several patches that are required to add/improve MSI-X (Message Signaled Interrupts) support on machines using System P processors. (Bugzilla #492580
A patch has been added to this release to enable the functionality of the previously problematic power button on Cell Blades machines. (Bugzilla #475658
Red Hat Enterprise Linux introduces a wide range of new features for IBM System z machines, most notably:
Utilizing Named Saved Segments (NSS), the z/VM hypervisor makes operating system code in shared real memory pages available to z/VM guest virtual machines. With this update, multiple Red Hat Enterprise Linux guest operating systems on the z/VM can boot from the NSS and be run from a single copy of the Linux kernel in memory. (BZ#474646)
Device driver support has been added in this update for the new IBM System z PCI cryptography accelerators, utilizing the same interfaces as prior versions. (BZ#488496)
Red Hat Enterprise Linux 5.4 adds support for processor degradation, which allows processor speed to be reduced in some circumstances (i.e. system overheating). (BZ#474664)
This new feature allows automation software to observe the machine state and act based on defined policies.
Processor degradation is supported on z990, z890 and later systems and is observed through SCLP system service event type 4 event qualifier 3. STSI will report the new capacity of the processor in the file:
Control Program Identification (CPI) descriptive data is used to identify individual systems on the Hardware Management Console (HMC). With this update, CPI data can now be associated with a Red Hat Enterprise Linux instance. (BZ#475820)
Fibre Channel Protocol (FCP) performance data can now be measured on Red Hat Enterprise Linux instances on the IBM System z platform. (BZ#475334)
Metrics that are collected and reported on include:
Performance relevant data on stack components such as Linux devices, Small Computer System Interface (SCSI) Logical Unit Numbers (LUNs) and Host Bus Adapter (HBA) storage controller information.
Per stack component: current values of relevant measurements as throughput, utilization and other applicable measurements.
Statistical aggregations (minimum, maximum, averages and histogram) of data associated with I/O requests including size, latency per component and totals.
Support has been added to the kernel to issue EMC Symmetrix Control I/O. This update provides the ability to manage EMC Symmetrix storage arrays with Red Hat Enterprise Linux on the IBM System z platform. (BZ#461288)
A new feature has been implemented in the kernel to perform an Initial Program Load (IPL) on a Red Hat Enterprise Linux virtual machine immediately following a kernel panic and dump.(BZ#474688)
Hardware that supports the configuration topology facility passes the system CPU topology information to the scheduler, allowing it to make load balancing decisions. On machines where I/O interrupts are unevenly distributed, CPUs that are grouped together and get more I/O interrupts than others will tend to have a higher average load, creating performance issues in some cases.
Previously, CPU topology support was enabled by default. With this update, CPU topology support is disabled by default, and the kernel parameter "topology=on" has been added to allow this feature to be enabled. (BZ#475797)
New kernel options can now be added using the IPL command without modifying the content of the CMS parmfile, allowing for temporary overwriting of kernel options that are already provided by the parmfile. The entire boot command line can be replaced with the VM parameter string, bypassing any kernel options from the parmfile. Furthermore, customers can create new Linux Named Saved Systems (NSS) on the CP/CMS command line. (BZ#475530)
Starting with z9 HiperSocket firmware returns the version string in a different format. This change resulted in missing mcl_level information in the qeth status message issued during online setting of the device. The updated qeth driver now correctly reads the new version string format of HiperSockets, allowing for a standardization of output format. (BZ#479881)
In Red Hat Enterprise Linux 5.4, the
package has been rebased to version 1.8.1. For a full list of features that this rebase provides, please refer to the Package Updates section of the Technical Notes
8.1. General Kernel Feature Support
Previously, support for raw devices in the upstream kernel was deprecated. However, this support has been returned to the kernel. Consequently, in Red Hat Enterprise Linux 5.4, support for raw devices has also been returned. Additionally, the initscripts packages have been updated, adding the previously dropped functionality of raw devices.(BZ#472891)
KVM guest-smp tlb flushing without
could corrupt memory as a KVM may add pages to the kernel freelist while another
may still be writing to them through guest mode. This update adds
support to the kernel and also corrects a bug found in an earlier patch wherein
was grown by existing drivers and caused a failed kABI check. This bug has been corrected by using an index that resides in an unused padding hole to avoid expanding the structure size.(Bugzilla #485718
Pointer and signed arithmetic overflow wrapping has not previously been defined in the Linux kernel. This could cause GCC
(GNU C Compiler) to assume that wrapping does not occur and attempt to optimize the arithmetic that the kernel may require for overflow testing. This update adds the
variable to GCC
in order to define wrapping behavior.(Bugzilla #491266
An issue of contention between processes vying for the same memory space in high end systems was recently identified by TPC-C (Transaction Processing Council) benchmarking. This update includes
patches which use direct IO and provide a significant (up to 9-10%) performance improvement. This update has been tested thoroughly and is used in the 5.4 kernel to improve scalability. For further information, see this article
. (Bugzilla #474913
A new tunable parameter has been added to this kernel, allowing system administrators to change the maximum number of modified pages
writes to disk per iteration each time it runs. This new tunable
or 4MB so that a maximum of 1024 pages get written out by each iteration of
. (Bugzilla #479079
A new option (
) has been added to kernel to assist in monitoring IO statistics per process. This assists with troubleshooting in a production environment. (Bugzilla #461636
In previous kernels, back-up processes were deteriorating DB2 server responsiveness. This was caused by
preventing processes writing to pagecache memory when more than half of the unmapped pagecache memory was dirty (even if
was set to 100%). A change made in this kernel update overrides this limiting behavior. Now, when the
is set to 100%, the system will no longer limit writing to pagecache memory. (Bugzilla #295291
option found in the previous kernel's ramdisk driver was causing data corruption when using large ramdisks under a reasonable system load. This update removes the unnecessary option and resolves the data corruption issues. (Bugzilla #480663
is used to examine the resource usage of a process. It is useful in diagnosing problems and gathering data on resource usage. In instances where a process interrogated by
was spawning child process threads, however, the results would be in incorrect as
would examine only the parent process and not interrogate its children. This update implements
to allow for accurate resource usage results in these instances. (Bugzilla #451063
would previously interfere with compiling C source code files, resulting in an error. This update includes a patch which corrects problematic kernel only definitions and resolves the compiling error. (Bugzilla #475790
In previous kernels the kernel version was not identified in panic or oops output messages. This update adds the kernel version details to oops and panic output. (Bugzilla #484403
During release 2.6.18, the kernel was configured to provide kernel-headers for the package glibc. That process caused various files to be improperly marked for inclusion. The
file was incorrectly marked and not included in the
rpm. This, in turn, caused problems with building other rpms. This update adds the
file and corrects the problem. (Bugzilla #463538
In some circumstances
, the process manager in the HP Unified Parallel C
(UPC) product, returned an ESRCH result and failed when calling
for a child process forked by a sub-thread. This update includes a patch to fix for this problem. (Bugzilla #472433
Functionality has been added to
to display backtrace information about running processes. This will assist in debugging hung systems. (Bugzilla #456588
In Red Hat Enterprise Linux 5.4, debugging the kernel has been improved with added features for generating core dumps. Core dumps (memory snapshots) are useful for debugging system and kernel crashes. With this update, it is now possible to perform a core dump on systems that utilize hugepages.(BZ#470411)
Additionally, kernel panic messages can now be extracted from a core dump file (vmcore) using the
8.2. General Platform Support
Throttling State (T-State) notification support has been added to the Advanced Configuration and Power Interface (ACPI) implementation in the kernel. Adding T-State notification enhances the use of Intel® Intelligent Power Node Manager technology for power management in data centers.(BZ#487567).
8.3.1. Open Fabrics Enterprise Distribution (OFED) Drivers
The OpenFabrics Alliance Enterprise Distribution (OFED) is a collection of Infiniband and iWARP hardware diagnostic utilities, the Infiniband fabric management daemon, Infiniband/iWARP kernel module loader, and libraries and development packages for writing applications that use Remote Direct Memory Access (RDMA) technology. Red Hat Enterprise Linux uses the OFED software stack as its complete stack for Infiniband/iWARP/RDMA hardware support.
In Red Hat Enterprise Linux 5.4, the following portions of OFED have been updated to the upstream version 1.4.1-rc3
Additionally, the following OFED drivers have been updated to the upstream version 1.4.1-rc3:
Red Hat closely tracks the upstream OFED code base in order to provide a maximal level of enablement for this still evolving technology. As a consequence, Red Hat can only preserve API/ABI compatibility across minor releases to the degree that the upstream project does. This is an exception from the general practice in the development of Red Hat Enterprise Linux.
8.3.2. General Driver Updates
driver for Intel 5400 class Memory Controllers has been updated with added support for Error Detection And Correction (EDAC). (BZ#462895)
i2c driver for the iic-bus interface has been updated, adding support for the AMD SB800 Family of products.
driver has been updated with support for the Broadcom HT1100 chipset. (BZ#474240)
dm9601 for Davicom Ethernet Adaptors has been updated.
8.3.3. Network Driver Updates
the bonding driver has been updated to the latest upstream version. This update, however has introduced symbol/ipv6 module dependency capabilities. Therefore, if IPv6 has been previously disabled (by inserting the
install ipv6 /bin/false line in the
/etc/modprobe.conf file) an upgrade to the bonding driver in 5.4 will result in the bonding kernel module failing to load. The
install ipv6 /bin/false line needs to be replaced with
install ipv6 "disable=1 for the module to load properly.
The drivers in the kernel for Intel® I/O Acceleration Technology (Intel® I/OAT) have been updated to version 2.6.24.(BZ#436048)
driver for Intel® Gigabit Ethernet Adapters has been updated to version 1.3.16-k2. This update also enables GRO support for the
driver. (BZ#484102, BZ#474881, BZ#499347).
driver has been updated, providing Virtual Function support for Intel 82576 Gigabit Ethernet Controllers. (BZ#480524)
driver for Intel 10 Gigabit PBetaCI Express network devices has been updated to version 2.0.8-k2. This update also enables GRO support for the
driver. (BZ#472547, BZ#499347).
driver for Broadcom Tigon3 ethernet devices has been updated to version 3.96. (BZ#481715, BZ#469772).
This driver update adds support for 5785F and 50610M devices. (BZ#506205)
driver has been added, providing Internet Small Computer System Interface (iSCSI) support for
network devices. (BZ#441979)
driver for Broadcom Everest network devices has been updated to version 1.48.105.(BZ#475481)
driver has been added, providing iSCSI support for
network devices. (BZ#441979)
The cxgb3 driver for the Chelsio T3 Family of network devices has been updated, enabling iSCSI TCP Offload Engines (TOE) and Generic Receive Offload (GRO) support. (BZ#439518
ethernet driver for NVIDIA nForce devices has been updated to version 0.62. (BZ#479740).
The sky2 driver for ethernet controllers using the Marvell Yukon 2 chipset has been updated. (BZ#484712).
The enic driver for Cisco 10G ethernet devices has been updated to version 126.96.36.1993. (BZ#484824)
The e1000e driver for Intel PRO/1000 ethernet devices has been updated to the upstream version 1.0.2-k2. (BZ#480241)
The be2net driver for Emulex Tiger Shark converged network adapters has been added as a Technology Preview.
8.3.4. Storage Driver Updates
driver now supports iSCSI. The
driver will access the
driver through the
module to provide iSCSI offload support. To manage
, use the
package. For instructions on
configuration, please refer to section 5.1.2
Note that the
bnx2i version included in this release does not support IPv6.
driver has been updated to provide support for bitmap merging
. This feature eliminates the need for full resync when performing data replication. (BZ#481226
scsi layer in this release features the following updates:
driver has been updated to apply several upstream fixes and provide support for iSCSI TOE devices. (BZ#439518
Note that the
cxgb3i version included in this release does not support IPv6.
This release includes the new
mpt2sas driver. This driver supports the SAS-2 family of adapters from LSI Logic. SAS-2 increases the maximum data transfer rate from 3Gb/s to 6Gb/s.
driver is located in the
directory, as opposed to the older
drivers that are located in
driver has now been updated to version 1.1.5-2461. This update applies several upstream fixes for bugs affecting queued scans, controller boot problems, and other issues. (BZ#475559
aic7xxx driver now features an increased maximum I/O size. This allows supported devices (such as SCSI tape devices) to perform writes with larger buffers.
cciss driver has been updated to apply upstream fixes for bugs affecting memory BAR discovery, the
rebuild_lun_table and the MSA2012 scan thread. This update also applies several configuration changes to
driver has been updated to version 188.8.131.529. This applies several upstream bug fixes, updates the
modules, and adds a new module parameter that controls debug logging at runtime. (BZ#484438
driver now supports MSI-X interrupts. (BZ#475717
driver has been updated to version 184.108.40.206. This enables hardware support for upcoming OEM programs. In addition, this update also applies the following bug fixes (among others):(BZ#476738
Virtualized fibre-channel switches are now supported.
Polling for error attention interrupts are now available.
A bug that caused memory leaks in
vport create and
delete loop is now resolved.
With this update, the
driver now also supports HBAnyware 4.1
and OneConnect UCNA
driver is now updated to version 3.04.07rh v2. This applies several bug fixes, including: (BZ#475455
MPT fusion driver bug that prevented the system from booting with the PAE kernel is now fixed.
Controllers are now set to
READY_STATE when the driver unloads.
mptsas driver now issues
TUR (Test Unit Ready) and
Report LUN commands before adding a device to the transport layer.
In addition, a patch that unexpectedly caused
mptctl_ioctl() to issue numerous yet benign kernel error messages is now reverted. With this release,
mptctl_ioctl() no longer issues these kernel error messages.
driver is now updated to version 4.08-RH1. This update applies the following upstream enhancements and fixes (among others):(BZ#475574
This upate adds a polling mode to the driver.
A bug affecting supported tape drives is now fixed. With this release, the
pthru timeout value is now set to the O/S layer timeout value for commands sent to tape drives.
driver is now updated to version 0.5.4. This applies several fixes and enhancements from upstream, and adds support for Marvell RAID
bus controllers MV64460, MV64461, and MV64462. (BZ#485126
driver has been updated to version 8.03.00.10.05.04-k, and now supports Fibre Channel over Convergence Enhanced Ethernet
adapters. With this release,
also applies several bug fixes from upstream, including: (BZ#471900
, and BZ#495094
Discrepancies detected during
OVERRUN handling on 4GB and 8GB adapters are now corrected.
vports are now alerted of any asynchronous events.
A bug that caused kernel panics with the QLogic 2472 card is now fixed.
stop_firmware command is no longer retried if the first attempt results in a times out.
The sector mask value is no longer based on the fixed
A bug that caused frequent path failures during I/O on multipathed devices is now fixed. (BZ#244967
The driver source code is now kABI-compliant.
dcbx pointers are now set to
NULL after freeing memory.
In addition to these updates, the
qla25xx firmwares included in the
qla2xxx driver are now updated to version 4.04.09.
driver now features improved driver fault recovery. This update fixes a bug in the driver that prevented adapter recovery if there were outstanding commands detected on the host adapter. (BZ#497478
This release includes the new
driver. This driver adds ethernet support for QLogic FCoE
10GB adapters. (BZ#479288
Technology Preview features are currently not supported under Red Hat Enterprise Linux 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.
The following Technology Previews are new or enhanced in Red Hat Enterprise Linux 5.4 beta. For detailed information on the Technology Previews in Red Hat Enterprise Linux 5.4, refer to the Technology Previews section of the 5.4 Technical Notes located at http://www.redhat.com/docs/manuals/enterprise/
A. Revision History
|Revision 0.4||Thu Jul 23 2009|
|Processed Storage Driver Updates section for SME tech review|
|Revision 0.3||Thu Jul 02 2009|
|Fixed various typos, added Beta Specific Known Issues.|
|Revision 0.2||Wed Jul 01 2009|
|Revision 0.1||Tue Apr 21 2009|
|Moved relevant content over from 5.3 Release Notes.|