Chapter 6. Upgrading to Red Hat Enterprise Virtualization 3.3

Libvirt-to-libvirt virtual machine migration

Perform virtual machine migration using libvirt-to-libvirt communication. This is safer, more secure, and has less host configuration requirements than native KVM migration, but has a higher overhead on the host CPU.

Isolated network to carry virtual machine migration traffic

Separates virtual machine migration traffic from other traffic types, like management and display traffic. Reduces chances of migrations causing a network flood that disrupts other important traffic types.

Define a gateway per logical network

Each logical network can have a gateway defined as separate from the management network gateway. This allows more customizable network topologies.

Snapshots including RAM

Snapshots now include the state of a virtual machine's memory as well as disk.

Optimized iSCSI device driver for virtual machines

Virtual machines can now consume iSCSI storage as virtual hard disks using an optimized device driver.

Host support for MOM management of memory overcommitment

MOM is a policy-driven tool that can be used to manage overcommitment on hosts. Currently MOM supports control of memory ballooning and KSM.

GlusterFS data domains.

Native support for the GlusterFS protocol was added as a way to create storage domains, allowing Gluster data centers to be created.

Custom device property support

In addition to defining custom properties of virtual machines, you can also define custom properties of virtual machine devices.

Multiple monitors using a single virtual PCI device

Drive multiple monitors using a single virtual PCI device, rather than one PCI device per monitor.

Updatable storage server connections

It is now possible to edit the storage server connection details of a storage domain.

Check virtual hard disk alignment

Check if a virtual disk, the filesystem installed on it, and its underlying storage are aligned. If it is not aligned, there may be a performance penalty.

Extendable virtual machine disk images

You can now grow your virtual machine disk image when it fills up.

OpenStack Image Service integration

Red Hat Enterprise Virtualization supports the OpenStack Image Service. You can import images from and export images to an Image Service repository.

Gluster hook support

You can manage Gluster hooks, which extend volume life cycle events, from Red Hat Enterprise Virtualization Manager.

Gluster host UUID support

This feature allows a Gluster host to be identified by the Gluster server UUID generated by Gluster in addition to identifying a Gluster host by IP address.

Network quality of service (QoS) support

Limit the inbound and outbound network traffic at the virtual NIC level.

Cloud-Init support

Cloud-Init allows you to automate early configuration tasks in your virtual machines, including setting hostnames, authorized keys, and more.