Red Hat ENTERPRISE 5.3 RELEASE NOTES Guia de Instalação descarregar pdf (Página 31)

Doing so will disable the netloop device, which prevents Address Resolution Protocol (ARP)

monitoring from failing during the address transfer process.

When running multiple guest domains, guest networking may temporarily stop working, resulting in

the following error being reported in the dom0 logs:

Memory squeeze in netback driver

To work around this, raise the amount of memory available to the dom0 with the dom 0_mem

hypervisor command line option.

6.3.2. x86 Architectures

Migrating paravirtualized guests through xm m igrate [domain] [dom0 IP address] does not

work.

When installing Red Hat Enterprise Linux 5 on a fully virtualized SMP guest, the installation may

freeze. This can occur when the host (dom 0) is running Red Hat Enterprise Linux 5.2.

To prevent this, set the guest to use a single processor using the install. You can do this by using

the --vcpus=1 option in virt-install. Once the installation is completed, you can set the guest

to SMP by modifying the allocated vcpus in virt -manager.

6.3.3. x86_64 Architectures

Migrating paravirtualized guests through xm m igrate [domain] [dom0 IP address] does not

work.

Installing the Virtualization feature may cause a tim e went backwards warning on HP systems

with model numbers xw9300 and xw9400.

To work around this issue for xw9400 machines, configure the BIOS settings to enable the HPET

timer. Note that this option is not available on xw9300 machines.

Installing Red Hat Enterprise Linux 3.9 on a fully virtualized guest may be extremely slow. In addition,

booting up the guest after installation may result in hda: lost interrupt errors.

To avoid this bootup error, configure the guest to use the SMP kernel.

Upgrading a host (dom 0) system to Red Hat Enterprise Linux 5.2 may render existing Red Hat

Enterprise Linux 4.5 SMP paravirtualized guests unbootable. This is more likely to occur when the

host system has more than 4GB of RAM.

To work around this, boot each Red Hat Enterprise Linux 4.5 guest in single CPU mode and upgrade

its kernel to the latest version (for Red Hat Enterprise Linux 4.5.z).

6.3.4 . ia64 Architect ure

Migrating paravirtualized guests through xm m igrate [domain] [dom0 IP address] does not

work.

On some Itanium systems configured for console output to VGA, the dom 0 virtualized kernel may fail

to boot. T his is because the virtualized kernel failed to properly detect the default console device

from the Extensible Firmware Interface (EFI) settings.

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

dom 0 when VGA is enabled by the EFI Maintenance Manager. As such, you need to supply the

following serial port information to the dom 0 kernel:

Speed in bits/second

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