Clustering Updates - Red Hat ENTERPRISE LINUX 5.4 - RELEASE NOTES Release Note

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Note
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. virsh, virt-
install and 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.
the 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.
The 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.
Important
The virtio-win component is only available via the Red Hat Network, and is not included on
the physical Supplementary CD for Red Hat Enterprise Linux 5.4. For more information,
Red Hat Knowledgebase
see the

2. Clustering Updates

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 Administration
the
3
http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Cluster_Suite_Overview/index.html
4
http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Cluster_Administration/index.html
2
.
4
documents.
Clustering Updates
Cluster Suite Overview
3
and
3

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