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    openstack Migration[通俗易懂]

    Migration allows an administrator to move a virtual machine instance from one compute host to another. 迁移允许管理员能够将虚拟机实例从一台计算主机移动到另一台。 This feature is useful when a compute host requires maintenance. 当一台计算主机需要维护时此功能非常有用。 Migration can also be useful to redistribute the load when many VM instances are running on a specific physical machine. 当为运行着多个虚拟机实例的物理机重新分配负载时迁移也是有用的。 There are two types of migration: 有两种类型的迁移 Migration (or non-live migration): In this case the instance will be shut down (and the instance will know that it has been rebooted) for a period of time in order to be moved to another hypervisor. 迁移(或非实时迁移):在这种情况下,该虚拟机实例将会在一段时间内被关闭,移到另一台机器上后再重启 Live migration (or true live migration): Almost no instance downtime, it is useful when the instances must be kept running during the migration. 实时迁移:几乎没有实例宕机,当实例必须保持在迁移过程中处于运行状态时它是有用的。 There are two types of live migration: 有两种类型的实时迁移 Shared storage based live migration: In this case both hypervisors have access to a shared storage. 基于共享存储的实时迁移:在这种情况下,两个虚拟机管理程序可以访问共享存储。 Block live migration: for this type of migration, no shared storage is required. 块实时迁移:对于这种类型的迁移,无共享存储是必需的。 The following sections describe how to configure your hosts and compute nodes for migrations using the KVM and XenServer hypervisors. 以下描述如何在主机节点和计算节点上配置KVM和XenServer虚拟机管理程序的迁移。 KVM-Libvirt Prerequisites 先决条件 Hypervisor: KVM with libvirt

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