红帽全球峰会This documentation is for a release that is no longer maintained
See documentation for the latest supported version 3 or the latest supported version 4.第 10 章 实时迁移
10.1. 虚拟机实时迁移
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10.1.1. 了解实时迁移
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实时迁移是在不中断虚拟工作负载或访问的情况下，将正在运行的虚拟机实例（VMI）迁移到集群中另一节点的过程。如果 VMI 使用 LiveMigrate 驱除策略，它会在 VMI 运行的节点置于维护模式时自动迁移。您还可以选择要迁移的 VMI 手动启动实时迁移。
虚拟机必须具有一个采用共享 ReadWriteMany (RWX) 访问模式的 PVC 才能实时迁移。
注意
只有在 HyperConverged Cluster 自定义资源（CR）中启用了 sriovLiveMigration 功能门时，附加到 SR-IOV 网络接口的虚拟机才支持实时迁移。当 spec.featureGate.sriovLiveMigration 字 段设置为 true 时，virt-launcher pod 使用 SYS_RESOURCE 功能运行。这可能会降低其安全性。
10.1.2. 更新实时迁移访问模式
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要使实时迁移可以正常工作，必须使用 ReadWriteMany（RWX）访问模式。如果需要，使用此流程更新访问模式。
流程
要设置 RWX 访问模式,请运行以下
oc patch命令：oc patch -n openshift-cnv \ cm kubevirt-storage-class-defaults \ -p '{"data":{"'$<STORAGE_CLASS>'.accessMode":"ReadWriteMany"}}'$ oc patch -n openshift-cnv \ cm kubevirt-storage-class-defaults \ -p '{"data":{"'$<STORAGE_CLASS>'.accessMode":"ReadWriteMany"}}'Copy to Clipboard Copied! Toggle word wrap Toggle overflow
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