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Chapter 6. Upgrading to Red Hat Enterprise Virtualization 3.3

6.1. Features Requiring a Compatibility Upgrade to Red Hat Enterprise Virtualization 3.3

Some of the features in Red Hat Enterprise Virtualization are only available if your data centers, clusters, and storage have a compatibility version of 3.3.

Table 6.1. Features Requiring a Compatibility Upgrade to Red Hat Enterprise Virtualization 3.3

Feature Description
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.