Cross-CPU Restrictions for Migration
You cannot perform live migration operations between a server that runs system firmware version 7.x and a server that runs system firmware version 8.x.
Therefore, the following live migration operations are not supported:
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From a server that runs version 7.x of the system firmware to a server that runs version 8.x of the system firmware
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From a server that runs version 8.x of the system firmware to a server that runs version 7.x of the system firmware