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 |
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Libvirt-to-libvirt virtual machine migration
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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.
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Isolated network to carry virtual machine migration traffic
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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.
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Define a gateway per logical network
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Each logical network can have a gateway defined as separate from the management network gateway. This allows more customizable network topologies.
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Snapshots including RAM
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Snapshots now include the state of a virtual machine's memory as well as disk.
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Optimized iSCSI device driver for virtual machines
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Virtual machines can now consume iSCSI storage as virtual hard disks using an optimized device driver.
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Host support for MOM management of memory overcommitment
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MOM is a policy-driven tool that can be used to manage overcommitment on hosts. Currently MOM supports control of memory ballooning and KSM.
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GlusterFS data domains.
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Native support for the GlusterFS protocol was added as a way to create storage domains, allowing Gluster data centers to be created.
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Custom device property support
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In addition to defining custom properties of virtual machines, you can also define custom properties of virtual machine devices.
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Multiple monitors using a single virtual PCI device
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Drive multiple monitors using a single virtual PCI device, rather than one PCI device per monitor.
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Updatable storage server connections
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It is now possible to edit the storage server connection details of a storage domain.
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Check virtual hard disk alignment
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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.
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Extendable virtual machine disk images
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You can now grow your virtual machine disk image when it fills up.
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OpenStack Image Service integration
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Red Hat Enterprise Virtualization supports the OpenStack Image Service. You can import images from and export images to an Image Service repository.
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Gluster hook support
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You can manage Gluster hooks, which extend volume life cycle events, from Red Hat Enterprise Virtualization Manager.
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Gluster host UUID support
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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.
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Network quality of service (QoS) support
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Limit the inbound and outbound network traffic at the virtual NIC level.
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Cloud-Init support
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Cloud-Init allows you to automate early configuration tasks in your virtual machines, including setting hostnames, authorized keys, and more.
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