Red Hat ENTERPRISE 5.3 RELEASE NOTES Installationsanleitung PDF herunterladen (Seite 32)

Number of data bits

Parity

io_base address

These details must be specified in the append= line of the dom 0 kernel in

/boot/efi/elilo.conf. For example:

append="com 1=19200,8n1,0x3f8 -- quiet rhgb console=tty0

console=ttyS0,19200n8"

In this example, com 1 is the serial port, 19200 is the speed (in bits/second), 8n1 specifies the

number of data bits/parity settings, and 0x3f8 is the io_base address.

Virtualization does not work on some architectures that use Non-Uniform Memory Access (NUMA).

As such, installing the virtualized kernel on systems that use NUMA will result in a boot failure.

Some installation numbers install the virtualized kernel by default. If you have such an installation

number and your system uses NUMA and does not work with kernel-xen, deselect the Virtualization

option during installation.

Currently, live migration of fully virtualized guests is not supported on this architecture. In addition,

kexec and kdump are also not supported for virtualization on this architecture.

7. Technology Previews

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.

Customers may find these features useful in a non-production environment. Customers are also free to

provide feedback and functionality suggestions for a T echnology Preview feature before it becomes fully

supported. Erratas will be provided for high-severity security issues.

During the development of a T echnology 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.

ALUA Mode on EMC Clariion

Explicit active-passive failover (ALUA) mode using dm-multipath on EMC Clariion storage is

now available. T his mode is provided as per T 10 specifications, but is provided in this release

only as a technology preview.

For more information about T 10, refer to http://www.t10.org.

ext4

The latest generation of the ext filesystem, ext4 , is available in this release as a T echnology

Preview. Ext4 is an incremental improvement on the ext3 file system developed by Red Hat

and the Linux community. T he release name of the file system for the Technology Preview is

ext4 dev.

The file system is provided by the ext4dev.ko kernel module, and a new e4 fsprogs

package, which contains updated versions of the familiar e2fsprogs administrative tools for use

with ext4. To use, install e4 fsprogs and then use commands like m kfs.ext4 dev from the

e4fsprogs program to create an ext4-base file system. When referring to the filesystem on a

mount commandline or fstab file, use the filesystem name ext4dev.

7. Technology Previews

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Red Hat ENTERPRISE 5.3 RELEASE NOTES Installationsanleitung Seite 32