Installation guide

Release Notes

When this occurs, add the boot parameter console=tty to the kernel boot options in /boot/efi/

elilo.conf.

• On some Itanium systems (such as the Hitachi Cold Fusion 3e), the serial port cannot be detected

in dom0 when VGA is enabled by the EFI Maintenance Manager. As such, you need to supply the

following serial port information to the dom0 kernel:

• Speed in bits/second

• Number of data bits

• Parity

• io_base address

These details must be specified in the append= line of the dom0 kernel in /boot/efi/

elilo.conf. For example:

append="com1=19200,8n1,0x3f8 -- quiet rhgb console=tty0

console=ttyS0,19200n8"

In this example, com1 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 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.

ALUA Mode on EMC Clariion

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

now available. This mode is provided as per T10 specifications, but is provided in this release only

as a technology preview.