Red Hat APPLICATION STACK 1.2 RELEASE Installation Guide Page 32

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Release Notes
32
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.
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