The Migrate option for Container Volumes in vSphere is not visible. It should appear under the Monitor tab > Container Volumes > Cloud Native Storage.
vCenter Server 7.0.3
This is a known issue affecting the vCenter 7.0.3 build. The plugin version has not been updated, and the vSphere UI is unable to automatically download the latest version.
The issue is resolved in 7.0U3q/ 8.0 U2
Workaround:
Clear the cache of vSAN plugin and restart the vSphere-UI.
vmon-cli --stop vsphere-ui
rm -rf /etc/vmware/vsphere-ui/vc-packages/vsphere-client-serenity/*
rm -rf /usr/lib/vmware-vsphere-ui/server/work
vmon-cli --start vsphere-ui