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Managing CPUs
Red Hat Virtualization allows a domain's virtual CPUs to associate with one or more host CPUs. This can be used to allocate real resources among one or more guests. This approach allows Red Hat Virtualization to make optimal use of processor resources when employing dual-core, hyperthreading, or other advanced CPU technologies. If you are running I/O intensive tasks, its typically better to dedicate either a hyperthread or entire core to run domain0. The Red Hat Virtualization credit scheduler automatically rebalances virtual cpus between physical ones, to maximize system use. The Red Hat Virtualization system allows the credit scheduler to move CPUs around as necessary, as long as the virtual CPU is pinned to a physical CPU.
Migrating a Domain
Migration is the transferal of a running virtual domain from one physical host to another. Red Hat Virtualization supports two varieties of migration — offline and live. Offline migration moves a virtual machine from one host to another by pausing it, transferring its memory, and then resuming it on the host destination. Live migration does the same thing, but does not directly affect the domain. When performing a live migration, the domain continues its usual activities, and from the user perspective is unnoticeable. To initiate a live migration, both hosts must be running Red Hat Virtualization and the xend daemon. The destinations host must have sufficient resources (such as memory capacity) to accommodate the domain bandwidth after the migration. Both the source and destination machines must have the same architecture and virtualization extensions (such as i386-VT, x86-64-VT, x86-64-SVM, etc.) and must be on the same L2 subnet.
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