When the I/O load on a virtual storage machine at the primary site increases global-active device enables you to migrate the virtual machine to the paired server without performing any operations on the storage systems.
As shown in this example, the server virtualization function is used to migrate virtual machine VM3 from the primary-site server to the secondary-site server. Because the GAD primary and secondary volumes contain the same data, you do not need to migrate any data between the storage systems.